Dr. Lucy Jones @DrLucyJones Twitter profile | Pikagi

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Dr. Lucy Jones

@DrLucyJones

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Seismologist, Founder of @dljcss , Author of The Big Ones (Doubleday), Viol Player. #MusicforClimateAction . @TempoAction Media requests go to my website

Southern California

https://t.co/uGntcxMrFs

Joined March 2014

Don't wanna be here? Send us removal request.

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@DrLucyJones

Dr. Lucy Jones

5 years

The potential for increased weather disasters coming with climate change make the earthquake problem look small. My music on the data of the changing climate: In Nomine Terra Calens: In the name of a warming Earth via @YouTube

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In Nomine Terra Calens: In the name of a warming Earth

This original instrumental work by seismologist Dr. Lucy Jones, "In Nomine Terra Calens: In the name of a warming earth", allows the listener to hear Earth’s...

www.youtube.com

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@DrLucyJones

Dr. Lucy Jones

5 years

So the M6.4 was a foreshock. This was a M7.1 on the same fault as has been producing the Searles Valley sequence. This is part of the same sequence -

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@DrLucyJones

Dr. Lucy Jones

5 years

Like any quake, today's M7.1 has a 1 in 20 of being followed by something even bigger. Smaller quakes - M5s are likely and a M6 is quite possible.

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@DrLucyJones

Dr. Lucy Jones

5 years

This is the same sequence. You know we say we 1 in 20 chance that an earthquake will be followed by something bigger? This is that 1 in 20 time

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@DrLucyJones

Dr. Lucy Jones

4 years

Yes. A M4.6 2 mi WSW of El Monte at 11:38. Almost the same location as the M5.9 Whittier Narrows earthquake in 1987

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@DrLucyJones

Dr. Lucy Jones

4 years

Yes, an earthquake. A M5.5 at the very southern end of the 2019 Ridgecrest aftershock zone. This is a large late aftershock - do you remember that I said these are common?

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@DrLucyJones

Dr. Lucy Jones

5 years

The sequence is decaying, and the decay rate is on the high side of average. So the probabilities of more aftershocks are dropping. In the next week, M4s are still certain, a couple of M5s are likely, but larger quakes are looking more improbable.

@DisastrousComms

Dr. Sara K. McBride 👠

@DisastrousComms

5 years

Updated Aftershock Forecast (7:45 PDT, 7/6/2019): One more aftershock forecast update from the @USGS tonight (note the dropping of the probabilities) for the #RidgecrestEarthquake :

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@DrLucyJones

Dr. Lucy Jones

5 years

Yes, we estimate that there's about a 1 in 10 chance that Searles Valley will see another M7. That is a 9 in 10 chance that tonight's M7.1 was the largest.

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@DrLucyJones

Dr. Lucy Jones

3 years

27 years since the Northridge earthquake. Shaken awake at 4:30, I jumped up to go to work. My 7 yr old panicked - he had learned with the Landers quake that Mommy could be at work for days. So I took him with me & he mapped cracks in the office walls. Now he's in nuclear physics

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@DrLucyJones

Dr. Lucy Jones

4 years

Thursday 3/19: US Covid19 cases at 10,000 Tuesday 3/24: US cases at 53,000 Doubling every 2 days. If this continues, we hit 1 million next week. But in California, cases increased from 910 to 2,450, doubling every 5 days. Maybe social distancing is slowing the virus down

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@DrLucyJones

Dr. Lucy Jones

4 years

The Idaho quake is not Yellowstone. It is over 200 miles away. Eruptions only happen when the magma moves from a chamber to the surface - and the small shaking from a quake that far away doesn't suddenly set all the magma moving.

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@DrLucyJones

Dr. Lucy Jones

3 years

Like #DrBiden , I learned that sometimes you need to add that "Dr.". In the 1980s, I had to dress in shorts and T-shirt to show I was a geologist. Nice clothes at Caltech meant you were a secretary.

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@DrLucyJones

Dr. Lucy Jones

5 years

Fifty years ago I watched the launch with my aerospace engineer dad who had worked on part of the lunar module. He had taken me to see the spacecraft before it was sent to Florida. I became a scientist because of Apollo - and my dad.

@byrdinator

Haley Byrd Wilt

5 years

folks, there should be a Saturn V rocket projected onto the Washington monument every day

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@DrLucyJones

Dr. Lucy Jones

5 years

My son is getting his PhD in climate science and we compared our fields. Earthquakes become less frightening as you learn more about them. Climate change becomes more frightening as you learn more. What is coming scares me.

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@DrLucyJones

Dr. Lucy Jones

3 years

The M4.0 that just happened was under Lennox, CA, near Inglewood. Very deep at 20 km, so everyone is at least 20 km away. Would have been felt by most people awake in LA. Movement was thrust, probably not on any mapped fault

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@DrLucyJones

Dr. Lucy Jones

3 years

Still waiting for the "moment magnitude" (most accurate) for tonight's earthquake in Carson. Current estimate is M4.4. Location is just north of the 1933 Long Beach zone.

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@DrLucyJones

Dr. Lucy Jones

3 years

In the 2000s, I joined the CA Seismic Safety Commission. Using the Dr. meant quicker appointments with the legislators. In the 2010s, that Dr. led to policy makers willing to listen to me and work together for change. #DrBiden , I and every other PhD deserve to use our titles.

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@DrLucyJones

Dr. Lucy Jones

5 years

M6.4 on a strikeslip fault about 10 miles from Ridgecrest. Not the San Andreas fault. It is an area with a lot of little faults but no long fault

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@DrLucyJones

Dr. Lucy Jones

9 months

Yes, we just had an earthquake. It looks like it was preceded by a small foreshock sequence(largest M2.5) that began Saturday morning

@CaltechQuake

Caltech Quake Bot

9 months

#AutoEQ A magnitude 5.0 (MI) #earthquake has occurred 4 mi SE of Ojai, CA at 14:41 PDT Aug 20, 2023 [2023-08-20 21:41 UTC]. #SCSN has not yet confirmed this event. For more info visit

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@DrLucyJones

Dr. Lucy Jones

4 years

The M7.7 Jamaican quake produced sideways motion on the fault, so the tsunami risk is low. (Seafloor should move up to make tsunami.) But if I'm ever at the beach and feel strong shaking, I move to high ground. Downside is I lose a day at the beach. The upside could be my life.

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@DrLucyJones

Dr. Lucy Jones

4 years

Disasters break systems where they are already weak. Weak water pipes break in an earthquake. The pandemic is breaking our human system of American society where it was already failing

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@DrLucyJones

Dr. Lucy Jones

5 years

We have now recorded over 3,000 earthquakes in the Searles Valley sequence.

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@DrLucyJones

Dr. Lucy Jones

4 years

Still getting everything processed, but it was a pretty good jolt here in Pasadena

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@DrLucyJones

Dr. Lucy Jones

5 years

Conquer your fear of earthquakes by making your home secure. Afraid of the ceiling fan? Get someone to wire it into the ceiling. Afraid of your house getting damaged? Get a foundation specialist to recommend strengthening. Empower yourself. @PauleyP

Seven Steps to Earthquake Safety

Seven Steps to Earthquake Safety Seven StepsFlyer (PDF) The Earthquake Country Alliance has worked with experts in earthquake science, preparedness, and mitigation to develop this step-by-step guide...

www.earthquakecountry.org

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@DrLucyJones

Dr. Lucy Jones

5 years

The M4.5 quake at 10:33 pm was in the East Bay at 14 km depth. Because any quake can be a foreshock, there’s a slight increase in the chance of a bigger quake for the next few days, at the same location near the Calaveras fault

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@DrLucyJones

Dr. Lucy Jones

4 years

Science is a process for understanding reality. To say ‘The science should not stand in the way of this’ is to say that "reality should not stand in the way". Unfortunately, reality doesn't care if you believe in it or not.

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@DrLucyJones

Dr. Lucy Jones

3 years

I have an appointment for my first Covid vaccine next week! The end is imaginable

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@DrLucyJones

Dr. Lucy Jones

3 years

I just heard another of my mentors has been lost to Covid. Losing our elders to Covid is knowledge that will not be shared, advice that will not be given and love that will never again be bestowed. Epidemiologists have told us how to slow the spread. Why can't we listen?

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@DrLucyJones

Dr. Lucy Jones

5 years

A day or 2 after every big earthquake of my career, we hear rumors that an even bigger earthquake is going to happen, but we are denying it to avoid a panic. This rumor is no more true now than it was after Northridge, Landers or Hector Mine.

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@DrLucyJones

Dr. Lucy Jones

4 years

All of the quakes in Puerto Rico since Dec. 29 can be considered 1 earthquake sequence. Sequences come in different sizes and this is clearly an active one. More M5s are likely another M6 possible. It takes a while for a region to settle down after quakes have stressed it.

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@DrLucyJones

Dr. Lucy Jones

4 years

The focal mechanism just came in - East-striking thrust fault. Just like 1987

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@DrLucyJones

Dr. Lucy Jones

4 months

The M4.4 that just occurred in SoCal is near Lytle Creek in Cajon Pass, where the San Andreas and San Jacinto faults come together. In 1970, there was a M5.2 with a M4.0 foreshock in close to the same location

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@DrLucyJones

Dr. Lucy Jones

3 years

In the 1990s, all the Caltech/USGS seismologists were on TV explaining earthquakes. The women were called the "earthquake ladies". The men were called seismologists. I started using the Dr. to remind the reporters that women could be scientists too.

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@DrLucyJones

Dr. Lucy Jones

4 years

Congratulations to Dr. Fauci for receiving Federal Employee of the Year. His selfless science in the public service is the ideal for which many of who have been in the federal government have worked.

@publicservice

The Partnership

4 years

👀 A few special guests joined #Sammies2020 to thank Dr. Anthony Fauci for his service. #FauciFan

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@DrLucyJones

Dr. Lucy Jones

4 years

The swarm happening now south of the Salton Sea, near Westmoreland is over 30 km south of the end of the San Andreas. It is in the Brawley seismic zone, a common source of swarms. So far largest is M4.4. Too far from the San Andreas to change the probability of a quake on it.

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@DrLucyJones

Dr. Lucy Jones

5 years

Parts of SoCal have power outages and wildfires. Imagine all of SoCal without power and with fires, disrupt the water supply, add aftershocks and you're starting to imagine what comes after the big San Andreas earthquake. #ShakeOut 2019 is a time to think about how to prepare

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@DrLucyJones

Dr. Lucy Jones

4 years

We’re having a Salton Sea swarm. It’s the fourth time since 2001. This is in the Brawley Seismic Zone about 12 km south of the end of the San Andreas fault

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@DrLucyJones

Dr. Lucy Jones

5 years

There is also always someone who claims they know a big quake is coming. This is not a scientific assessment.

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@DrLucyJones

Dr. Lucy Jones

5 years

Hmm. This is missing an important part of the quote. I'm certain the probability of a big San Andreas event is 100% IF YOU GIVE ME ENOUGH TIME. In other words, plate tectonics isn't stopping. But it's possible the big one is still 100 years away.

@RetroJes

Jes C 🛸

5 years

“I am certain that the chance of a very big earthquake on the San Andreas Fault is 100%,” -⁦ @DrLucyJones ⁩

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@DrLucyJones

Dr. Lucy Jones

5 years

A M6.6 near Ridgecrest. The M4.2 a half hour before was a foreshock. This area had lots of M5+s in the 198os. More soon

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@DrLucyJones

Dr. Lucy Jones

4 years

The 1987 M5.9 had no foreshocks. Its largest aftershock was M5.3 about 3 days later.

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@DrLucyJones

Dr. Lucy Jones

5 years

The M6.9 in Indonesia has no impact on California. That size quake happens on average every few weeks. One quake triggers others nearby but at distances more than ~3x the length of the fault, we see no signal. A M6.9 affects about 60 miles out.

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@DrLucyJones

Dr. Lucy Jones

4 years

What does it mean? It means you live in California

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@DrLucyJones

Dr. Lucy Jones

4 years

Science does know, actually. Climate change is making the world hotter and wildfires more intense.

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Episode 11 - Raging Wildfires | Getting Through It

As humans move deeper and deeper into the wildlands as part of sprawling cities, and with a rapidly warming earth, wild fires are more intense and more destructive than ever before. In this episode,...

drlucyjonescenter.podbean.com

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@DrLucyJones

Dr. Lucy Jones

5 years

The #Ridgecrest earthquake is having a robust aftershock sequence. There have been 6 M4+ events and ~30 M3+ in the first 90 minutes. That means there will be plenty more aftershocks today.

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@DrLucyJones

Dr. Lucy Jones

4 years

In just 2.5hr Westmoreland swarm has had 45 quakes of M≥3.0. One of the largest swarms we have had in the Imperial Valley - and it is historically the most active swarms in SoCal.

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@DrLucyJones

Dr. Lucy Jones

4 years

We just had a M5.8 south of Lone Pine in the Owens Valley. It is the same location as the M4.6 two nights ago. That is now considered a foreshock

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@DrLucyJones

Dr. Lucy Jones

5 years

The aftershocks to the #SearlesValley earthquake show that two faults are involved. One strikes northwest and the other northeast. You can see the aftershocks at

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@DrLucyJones

Dr. Lucy Jones

3 years

People have been asking about the "earthquake" in LA around 9:20 this morning. Many people report feeling it but the seismograms clearly show the earth was not moving, only the air. So it was a sonic boom.

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@DrLucyJones

Dr. Lucy Jones

5 years

If the daily probability of the Big One was 50/50, then the chance it would happen in the next week would be >99%. Real probability is about 2% per yer, or 1/20,000 each day. Your change of being in a car accident today is ~1/7,000. I still wear my seat belt every day.

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@DrLucyJones

Dr. Lucy Jones

4 years

None of the earthquakes that have been happening in the Imperial Valley are anywhere near the San Andreas fault. They are in the Brawley Seismic Zone - a network of small faults that connect the San Andreas and Imperial faults. Historically largest Brawley event was M5.8

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@DrLucyJones

Dr. Lucy Jones

9 months

You can answer your own question. Look at this Twitter account. Look at how often it has predicted a big quake in California in the last 2 years. None of them have happened. Why should they suddenly be right now?

@lisalmn

Lisa Leeman

9 months

Dear @DrLucyJones - I just saw this on Twitter. Is it a possibility or a hoax? (Or I’m between?). Many thanks if you will weigh in.

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Dr. Lucy Jones

4 years

A M6.5 earthquake just happened in Idaho this evening, northeast of Boise. @USGS website is not showing aftershocks yet, but you should expect them. The largest aftershock to the average M6.5 is M5.3. Half have aftershocks even bigger than this

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@DrLucyJones

Dr. Lucy Jones

4 years

(1 of 2)Why you should not expect me to get up in the middle of the night for a M3+ quake: 1. A M3+ happens in SoCal a few times per week. I sleep 8 hr/day so I'd be disrupting my sleep ~1/wk 2. There's nothing interesting about another M3. They happen every week.

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@DrLucyJones

Dr. Lucy Jones

4 years

We are all dealing with the impact of the Corona virus and I though I’d share how, as a scientist, I think about the risk and my actions in response. First, I try to stay with the data. As data comes in, answers will change. That’s good science. 1/5

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@DrLucyJones

Dr. Lucy Jones

4 months

This quake is M4.2 2 miles SW of San Bernardino. Location is pretty deep (15 km) very close to the San Jacinto fault. That part of the fault is generally locked - it had a M7 in the 19th century. We often see small quakes like this below locked segments.

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@DrLucyJones

Dr. Lucy Jones

1 year

I am frustrated at the way we all jump to the conclusion that the problems in Turkey are all their mistakes and aren't willing to looking at the shortcomings we all share.

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Opinion: If you think the earthquake damage you see in Turkey can't happen here, think again

In L.A. as in Turkey, builders are supposed to meet a "life safety" standard — structures that won't collapse in a big earthquake. That doesn't make those buildings resilient.

www.latimes.com

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@DrLucyJones

Dr. Lucy Jones

2 years

At noon on 1/17/1994, I said in a press conference that we would probably have a M5 aftershock that day - just because the rate of aftershocks was that high. When a M5.6 happened at 3:33pm, some thought I had predicted the event. I also predict it rains in Kauai every day

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@DrLucyJones

Dr. Lucy Jones

5 years

Bigger quakes last for a longer time. The fault was producing energy for about 5 seconds. What you feel is that plus reverberations

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@DrLucyJones

Dr. Lucy Jones

4 years

Repeat time. Quakes make other quakes more likely, but only nearby. Today's M4.9 fault is ~2 miles across, so it can affect quakes within ~5 miles. The only faults nearby are small. In other words, there is no scientific reason to predict a big quake in another location today

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@DrLucyJones

Dr. Lucy Jones

3 years

Preliminary M3.9 near Maywood, deep under the Los Angeles basin. Depth is 17 km which puts it near the bottom of the seismogenic layer

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@DrLucyJones

Dr. Lucy Jones

4 years

This Russian quake is not the type that usually produces a tsunami. It is deeper and smaller than the quakes that have made big trans-Pacific tsunamis.

@CPPGeophysics

Jascha Polet

4 years

M7.6 earthquake near the Kuril Islands appears to be a deep (~50 km) compressional bending event in the outer rise, where the subducting slab bends before it dives into the mantle, which reduces the likelihood of a significant tsunami

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@DrLucyJones

Dr. Lucy Jones

4 years

Probability of being a foreshock dies off just like aftershocks do. One hour after the 1st quake, the chance is down from 5% to 4%. By tomorrow evening, it will be below 1%

@ReporterClaudia

Claudia Peschiutta

@ReporterClaudia

4 years

@kyoshino But doesn’t the probability drop over time, @DrLucyJones ?

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@DrLucyJones

Dr. Lucy Jones

2 years

With a tsunami advisory in effect, some reminders about what that means: 1. An advisory means expect waves of 1-3 feet, so a short term increase in sea level of 1-3 ft. If you are more than 3 feet above sea level it will not affect you. This is only an issue near the beach [1/2]

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@DrLucyJones

Dr. Lucy Jones

3 years

A M7.0 quake occurred near Acapulco tonight. The location and focal mechanism are consistent with being part of the plate boundary where the Cocos plate is goin under the North American plate. M7 is smaller than many subduction zones, but common in the Mexico subduction zone

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@DrLucyJones

Dr. Lucy Jones

3 years

Happy Mother's Day to the young professional mothers trying to balance everything. From a few decades experience, I say choose your time wisely. You need time to: -help your children grow -further your career -maintain your mental health. Choose wisely. You only get 2 of the 3

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@DrLucyJones

Dr. Lucy Jones

4 years

Most foreshocks are very close (a few km) to their mainshock, so we think there is some increase in risk when quakes happen within 10 km of the San Andreas. 1 km away would be much riskier than 10. Today's quakes are ~12 km away. I am not cutting my vacation short.

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@DrLucyJones

Dr. Lucy Jones

5 years

In Apollo, we came together, invested our taxes, supported innovation, achieved our goals & were so proud of the result. We must do all this to create the carbon neutral energy system we need to survive climate change. Whichever nations pull it off will lead the 21st century

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Dr. Lucy Jones

3 years

No one ever said the vaccines were 100% effective. The vaccine reduces your chance of catching COVID if exposed. Wearing a mask reduces your chance of being exposed. Basic probability statistics says doing both makes you even safer.

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@DrLucyJones

Dr. Lucy Jones

4 years

The definition of Southern California? Looking down the San Andreas fault to see the wildfire.

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@DrLucyJones

Dr. Lucy Jones

4 years

A little earthquake in Yorba Linda. M3.5 at 3:18 pm. Not on any of the big mapped faults. Just one of the little adjustments.

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@DrLucyJones

Dr. Lucy Jones

4 years

The M4.3 at 4:30 has now been followed by 2 aftershocks above M3. The most recent is M3.8. Also ~50 other aftershocks so far. Episode 6 of my podcast is “What does it mean when you have a lot of earthquakes?”

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@DrLucyJones

Dr. Lucy Jones

4 years

Tonight's quake more scientifically interesting. M4.6 north of Barstow, ~halfway between 2019 Ridgecrest and 1992 Landers faults. 1947 M6.5 Manix quake was ~30 miles east of tonight's quake. Occurred on an unmapped thrust fault. Only Barstow seems to care

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@DrLucyJones

Dr. Lucy Jones

3 months

The current California atmospheric river (AR) storm is not an ARkStorm. ARs are a type of storm that bring in much of the rain in California. ARkStorm is AR 1000(k), the very rare AR that lasts for so long that it overwhelms our flood control capacity. Learn more in thread

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@DrLucyJones

Dr. Lucy Jones

4 months

The New Years Day M7.5 in Japan caused strong shaking for many people, but because of strong, enforced building codes in Japan, the damage is much less than it could have been. The people on the Noto peninsula will have been hit the hardest. This thread explains more

@USGS_Quakes

USGS Earthquakes

4 months

Notable quake, preliminary info: M 7.5 - 42 km NE of Anamizu, Japan

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@DrLucyJones

Dr. Lucy Jones

4 years

. @Caltech operates the Mount Wilson seismic station. It has recorded all the important California earthquakes for 100 years. The #Bobcat fire threatens to destroy it today.

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@DrLucyJones

Dr. Lucy Jones

4 years

Although tonight's quake is in the same location as 1987 Whittier Narrows, it is not considered an aftershock because the aftershocks died off completely in less than 2 years. Mor about aftershocks and other facts of earthquake clustering in my podcast:

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Episode 2 - The Earthquake Name Game | Getting Through It

In this episode, Dr. Jones explains how earthquakes get their names, why an aftershock is called an aftershock, and how those names can change.... any why it's important for you to know these things!

drlucyjonescenter.podbean.com

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@DrLucyJones

Dr. Lucy Jones

5 years

I'll repeat that this is still a normal aftershock sequence. Little clusters of M3s = normal. Gradual expansion of the zone is normal. Each aftershock is relieving stress in some places and redistributing it to others. It might grow a few more miles - or not. Random is normal

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@DrLucyJones

Dr. Lucy Jones

5 years

For conspiracy theorists and numerologists out there, June 28 has had more significant California quakes than any other date: 1966 Parkfield M6.0, 1991 Sierra Madre M5.8, and 1992 M7.3 Landers.

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@DrLucyJones

Dr. Lucy Jones

6 years

Why Twitter is a difficult place to do science education: 1. Science should include WHY we know something to be true. That takes more than 280 characters. 2. Twitter rewards being popular. That is not the same as being true. Science is about what's true.

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@DrLucyJones

Dr. Lucy Jones

4 years

Today’s quake are garden variety California quakes. In an area with lots of faults and both the 1994 Northridge and 1971 Sylmar quakes. The good [ordinary] life of the Golden State

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@DrLucyJones

Dr. Lucy Jones

3 years

The Lennox M4.0 also had a M3.0 foreshock and a bunch All the events are at the same deep depth

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@DrLucyJones

Dr. Lucy Jones

4 months

Completely unrelated to Japan, SoCal just had a M4.1 offshore from Palos Verdes. Not near any known fault. Way too small to even talk about tsunamis. Japan's M7.5 is 100,000 times bigger than a M4.1

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@DrLucyJones

Dr. Lucy Jones

9 months

There is no correlation between the earthquake and the tropical storm. Just a coincidence that is a good reminder that disaster resilience is a multi-hazard endeavor.

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@DrLucyJones

Dr. Lucy Jones

4 years

The possibility of a San Andreas quake AT ANY TIME should already be part of your planning or you shouldn't be in California.

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@DrLucyJones

Dr. Lucy Jones

4 years

A tsunami primer (1 of 6): Tsunamis begin when the shape of the seafloor changes suddenly. The water above the changed seafloor is pushed up, but then because it is a fluid, immediately falls down to both sides, creating the wave that moves towards shore

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@DrLucyJones

Dr. Lucy Jones

2 years

The quake sequence off Oregon is on the Blanco Fracture zone. I searched the catalog for M≥5 events in that region since 1980 and got 133 events (more than 3/yr). M5s on Blanco are very common and have never been followed by something on land. Plate tectonics in real time.

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@DrLucyJones

Dr. Lucy Jones

5 years

The M5.0 today is a Ridgecrest aftershock (remember we said a month ago that large, late aftershocks are common). It has its own aftershocks. So the next day or two should have a few M3s and has an increased (but still low) chance of another M5+

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@DrLucyJones

Dr. Lucy Jones

2 years

Removing a mask mandate is not a mandate to remove your mask. (You have choices.)

Tweet card media

Episode 89 - Pandemic to Endemic and What It Means for You

After nearly two years of living with COVID-19, here in California, the mandates for masking are being lifted, and some people are acting as though the pandemic is over. As we move to endemic, Dr....

www.podbean.com

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@DrLucyJones

Dr. Lucy Jones

3 years

If you're asking if a quake prediction is legit: Look at the predictor's account. How many times have they posted a prediction? (Must be before the quake - postdictions don't count.) How many times did a quake actually happen? I haven't seen a legit one yet.

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@DrLucyJones

Dr. Lucy Jones

3 years

A tsunami warning has been issued because of the M8.1 for New Zealand. For Hawaii, we have a watch and nothing so far for California. We really are too far away. In the US, the alerts will always come from NOAA.

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@DrLucyJones

Dr. Lucy Jones

5 years

Quakes trigger other quakes nearby. no more than 3-4 times the length of their fault. A M7.0 might be able to trigger over 100 miles or so. No effect anywhere else. Alaska does not trigger California quakes and vice versa.

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@DrLucyJones

Dr. Lucy Jones

3 years

The moment magnitude is 4.3. The focal mechanism shows a strike-slip at 15 km depth.

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@DrLucyJones

Dr. Lucy Jones

6 years

Every quake has a few % chance of being followed by something larger. So tonight has a slightly greater chance of a big quake than other nights. If you are in bed when a big quake hits, often the safest thing to do is stay in bed and cover your head with a pillow

@SCEC

Statewide California Earthquake Center

6 years

We are now concluding social media updates for tonight's M4.4 near La Verne. If you have any questions, let us know. Thanks everyone for your interest in earthquake science and preparedness - stay safe! And if you feel any other earthquakes tonight (via ):

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@DrLucyJones

Dr. Lucy Jones

1 year

Well, a M4.2 in Malibu doesn’t shake Pasadena enough to wake anyone up. This is a similar location to the M5.2 that happened during the Rose Bowl game. That was felt in Pasadena with a “hmm, what was that? Do you think that was an earthquake?” Type of reaction

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@DrLucyJones

Dr. Lucy Jones

3 years

A pretty interesting day in the South Pacific. The M8.1 near Kermadec looks like a standard subduction interface event - the main plate tectonic boundary. The M7.4 at the same location ~2hrs earlier is clearly a foreshock. The M7.3 near New Zealand is 800km away, more ambiguous

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@DrLucyJones

Dr. Lucy Jones

4 years

June 28 Our favorite earthquake day in California: 6/28/1966: M6 Parkfield 6/28/1991: M5.8 Sierra Madre 6/28/1992: M7/3 Landers

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@DrLucyJones

Dr. Lucy Jones

4 years

Bigger earthquakes last for a longer time. A M6.5 is usually about 10 seconds. The great Chilean earthquake of 1960 was M9.5 and lasted for 11 minutes

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@DrLucyJones

Dr. Lucy Jones

5 years

People are talking about the “unprecedented” movement of the Garlock fault after the Ridgecrest quake. It’s true we haven’t seen this in the 30 years of modern geodesy on the Garlock fault. But we’ve seen it many times on the San Andreas & it has never caused a quake. 1/

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@DrLucyJones

Dr. Lucy Jones

3 years

Tonight's swarm is closer to the San Andreas, but still not in "triggering range". All foreshocks in California have been within 10 km of their mainshock and most were within 3 km. This is still 20+ km away

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