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Dr. Lucile Bruhat

@seismolucy.bsky.social
4.1K followers 684 following 54 posts

Earthquake physics, catastrophe modeling, disaster resilience, and risk management at AXA Group #WomenInSTEM She/her ⚒️🧪

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Reposted by Dr. Lucile Bruhat
Kelly Hereid @kellyhereid.bsky.social · 25/06/2026
Hey earthquake types - Swiss Re is hiring an entry grad level earthquake catastrophe modeler. Strong science shop if this is your thing:
linkedin.com
#hiring #catastrophemodeling #earthquake #reinsurance | Adam Hatzikyriakou
We are hiring! The Cat Perils team at Swiss Re is looking for an enthusiastic Natural Catastrophe Specialist with experience in earthquake modeling. This position is located in Armonk, NY. Do you wan...
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Reposted by Dr. Lucile Bruhat
Gareth Funning @gfun.earth · 25/06/2026
It's taken me a while, but here is my first interferogram of the Venezuela earthquakes from Sentinel-1. It's an ascending track to the west of the epicenter, and the pattern of displacements is consistent with slip on a fault that runs close to and parallel to the coast.
Interferogram of the earthquakes in Venezuela. Shows the western extent of the rupture, and that the earthquake was likely on an E-W striking fault.
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Bertrand Delouis @bertranddelouis.bsky.social · 25/06/2026
We showed the eastward rupture propagation : bsky.app/profile/bert...
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Adam Pascale @seislologist.bsky.social · 25/06/2026
Has anyone studied the effect of two overlapping large earthquakes? I imagine some of the energy waves would harmonise and amplify the ground motion, making the effects worse than if the larger event had occurred on its own. It would certainly increase the duration of the shaking.
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Dr. Judith Hubbard @judithgeology.bsky.social · 25/06/2026
⚒️ 🧪 A catastrophic earthquake just struck northern Venezuela. Large buildings have collapsed, and the USGS PAGER is forecasting thousands of fatalities. Our colleague in Caracas, Dr. Frank Audemard, has shared with us what the earthquake felt like and footage from the region. Here’s what we know.
earthquakeinsights.substack.com
Catastrophic M7.5 earthquake strikes northern Venezuela
Severe damage; collapsed buildings; significant fatalities possible
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Brian McNoldy @bmcnoldy.bsky.social · 22/08/2025
August 22, 2005... 3 days from #Katrina' s landfall in southeast FL as a Category 1 hurricane and 7 days away from its final landfall in eastern LA as a Category 3 hurricane. Here's a wind swath generated from a parametric model I coded up. Wind speed reduction over land is a generous 30%. [1/2]
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Brian McNoldy @bmcnoldy.bsky.social · 22/08/2025
The track history with some selected satellite images are shown here. [2/2]
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Roland Pease @peaseroland.bsky.social · 31/07/2025
Much of this week's Science in Action is taken up with the Mw8.8 earthquake in Kamchatka and the tsunami that followed. www.bbc.co.uk/programmes/w...
bbc.co.uk
BBC World Service - Science In Action, Getting ahead of tsunamis
The scientist behind the pacific tsunami warning and the decades of work before it.
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Brandon Bishop @brandontbishop.bsky.social · 30/07/2025
8. The Aegean slab is the oldest piece of subducting oceanic lithosphere on Earth and has just a single plain of Wadati-Benioff Zone seismicity. Models for single vs double plains of seismicity don't think about that enough--can't be a function of age/temperature.
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Brandon Bishop @brandontbishop.bsky.social · 30/07/2025
4. For reliable/robust features, nothing we know about the Farallon slab has really changed since Steve Grand's late 90s paper. The parts that later models agree on tend to be identical to his model.
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Dr. Lucile Bruhat @seismolucy.bsky.social · 30/07/2025
www.lemonde.fr/les-decodeur...
lemonde.fr
Comment mesure-t-on la force d’un séisme ?
Intensité, magnitude, échelle de Mercalli… depuis les années 1960, les sismologues n’utilisent plus la célèbre échelle de Richter, lui préférant la magnitude de moment basée sur des mesures physiques.
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Dr. Lucile Bruhat @seismolucy.bsky.social · 30/07/2025
⚒️🧪Pleased to be cited in this National Geographic article about the earthquake and tsunami risks in the northwest Pacific by @squigglyvolcano.bsky.social #seismology #earthquakes #sciencecommunication
nationalgeographic.com
What caused the 8.8 magnitude quake that sent tsunamis to Hawaii and California
Here's what we know about what caused the earthquake off Russia's Far East and why the tsunami it generated weren't as big as anticipated.
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GFZ Helmholtz-Zentrum für Geoforschung @gfz.bsky.social · 30/07/2025
Fresh from the press, so to speak, a result of our #tsunami model based on the specifics of this earthquake (we will update it one we have more model runs). The color code is wave height in metres. The dotted line in the centre of the picture is the Hawaiian island chain.
Modelling results for the #Kamchatka tsunami from July 30, 2025. Pacific ocean in dark blue, red and yellow colors show the wave heights. In grey, the land masses of Eurasia (upper left), Australia (lower left) and the Americas (right).
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Dr Robin George Andrews @squigglyvolcano.bsky.social · 30/07/2025
NEW: A magnitude 8.8 megaquake blasted tsunami waves across the Pacific today. Here's everything you need to know about it, including: -Why it happened -Why it generated a widespread tsunami -Why the timing of this megaquake is a bit weird Me, for NatGeo www.nationalgeographic.com/science/arti...
nationalgeographic.com
What caused the 8.8 magnitude quake that sent tsunamis to Hawaii and California
Here's what we know about what caused the earthquake off Russia's Far East and why the tsunami it generated weren't as big as anticipated.
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Dr Robin George Andrews @squigglyvolcano.bsky.social · 30/07/2025
NEW: You may wonder why Japan’s 2011 mag-9.1 quake created a colossal tsunami that killed 18,000 people, while today’s mag-8.8 quake made a big, but not catastrophic, tsunami. For @sciam.bsky.social, I explore why. (Hint: it’s because the 2011 quake was SO much stronger.)
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Dr. Alice-Agnes Gabriel @inseismoland.bsky.social · 30/07/2025
Magnitude 8.7 #earthquake in Kamchatka, following a M7.4 last week - may be largest earthquake since 2011, 8th largest on record globally, #tsunami warning in place for US west coast and Canada - the historic 1952 M9 closely caused a destructive tsunami across the Pacific
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Reposted by Dr. Lucile Bruhat
Daniel Swain @weatherwest.bsky.social · 30/07/2025
Putting on my "general geohazards communicator" hat here for a moment: In all but the *very* most extreme earthquake-generated tsunami events, locations more than ~100ft above sea level are generally safe. In vast majority of such events, "vertical evacuation" is the way to go!
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GFZ Earthquake Alerts (GEOFON) @geofon.bsky.social · 30/07/2025
Magnitude : 5.2 Region: *Near East Coast of Kamchatka* Time: 2025-07-30 05:51:51 UTC Epicenter : 158.92°E 51.97°N Depth: 30 km *First posted at: 06:03 UTC* geofon.gfz-potsdam.de/eqexplorer/ev… #GEOFON #GFZ #earthquake #magnitude
Map showing the earthquake of 2025-07-30 in Near East Coast of Kamchatka
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Seismica @weareseismica.bsky.social · 06/07/2025
The M7.1 Ridgecrest earthquake struck California 6 years ago this weekend. At the time it was the largest earthquake in the area for 20 years. Events like this provide an opportunity to learn from the earth, and to share that research with the world in journals like Seismica.
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Nature Geoscience @natgeosci.nature.com · 25/07/2025
⚒️ Article: Ruptures on more structurally mature faults are more localized and therefore expected to host faster ruptures with less off-fault deformation @quakes-from-space.bsky.social www.nature.com/articles/s41...
nature.com
Localization of inelastic strain with fault maturity and effects on earthquake characteristics - Nature Geoscience
Ruptures on more structurally mature faults are more localized and therefore expected to host faster ruptures with less off-fault deformation, according to remote-sensing and field measurements from h...
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Boris Behncke @borisetneo.bsky.social · 02/06/2025
First paroxysmal eruptive episode at #Etna's Southeast Crater since 18 months, on the morning of 2 June 2025. Collapse of the northeast flank of the crater generated a spectacular (but harmless) pyroclastic flow down the upper side of the mountain. (1/2)
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Tom Gabrieli @tgabrieli.bsky.social · 12/05/2025
Two features that clearly demonstrate the on-fault displacement field surrounding rupture propagation are the plant next to the wall on the left and the gate itself. Since rarely do seismic stations located so close to the fault (meters away!), these features offer unprecedented observations: 🧵⚒️🧪
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Tom Gabrieli @tgabrieli.bsky.social · 11/04/2025
#FridayFold (Probably) Cretaceous carbonates tightly folded to a recumbent fold. Honestly I have no idea of what created this fold, aside from that being is an area of left-right extension and normal faulting. Really puzzling. On the Nuweiba-Taba road, Sinai peninsula
A rock wall next to a road. The wall show tightly folded rock layers
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Tom Gabrieli @tgabrieli.bsky.social · 25/04/2025
Published!!!! The first article of my PhD and the first from the lab that I set up!! 🤩🤩 We study the dynamic effects of fault bends on earthquake ruptures by imaging shear ruptures in PMMA plates propagating through bends (double bends to be exact). www.pnas.org/doi/10.1073/... ⚒️🧪
pnas.org
Lab earthquakes reveal a wide range of rupture behaviors controlled by fault bends | PNAS
Natural faults are typically nonplanar and exhibit multiple bends, which deviate from the general fault orientation at different angles. However, w...
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Jascha Polet @jascha.bsky.social · 23/04/2025
For more context on today’s M6.2 #earthquake in the Sea of Marmara, a figure from Bohnhoff et al. (2013) shows the major North Anatolian Fault Zone segments with potential future rupture scenarios and their associated magnitudes. Today’s quake is located near the center of the Marmara segment. ⚒️🧪
Major NAFZ fault segments in the Marmara and Izmit regions in northwestern Turkey (simplified). Two potential future rupture scenarios and their associated earthquake magnitudes are shown reflecting the activation of the Marmara segment of the NAFZ as one single (∼7.4 M) or multiple (∼7.0 M) events. Green, orange/red and brown lines mark major fault segments of the Ganos 1912, Izmit 1999 and Düzce 1999, M>7, rupture zones, respectively. The Marmara seismic gap between the Ganos and Izmit zones has not experienced a similar sized event since 1766. The numbers between segment boundaries are observed time delays between the initiations of slip on consecutive segments. Question marks indicate potential segment boundaries beneath the Sea of Marmara.
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Christophe Vigny @cvigny.bsky.social · 19/04/2025
This not going to end well.....
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Dr. Wendy Bohon @drwendyrocks.bsky.social · 14/04/2025
M5.2 outside of Julian. Did you feel it? Report it! There will be felt aftershocks. If you feel earthquake, shaking drop down to the ground, take cover underneath the sturdy object and hold on until the shaking has stopped. earthquake.usgs.gov/earthquakes/...
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Jascha Polet @jascha.bsky.social · 14/04/2025
Map of today’s M5.2 #earthquake near Julian in the context of regional past seismicity. This event was located near the Elsinore fault and relatively deep at 18 km. 🧪⚒️
Map of today’s M5.2 #earthquake near Julian in the context of regional past seismicity. Earthquakes from many different catalogs are plotted. Current sequence with blue outlines.
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Christophe Vigny @cvigny.bsky.social · 03/04/2025
theconversation.com/seisme-au-my...
theconversation.com
Séisme au Myanmar : les dessous tectoniques d’une catastrophe majeure
Les secousses du séisme du 28 mars au Myanmar ont été très destructrices, notamment car elles ont « liquifié » le sol sous les bâtiments dans une plaine sédimentaire.
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Reposted by Dr. Lucile Bruhat
Eos @eos.org · 11/04/2025
Xavier Le Pichon, a pioneer in early plate tectonics research died on 22 March. Pichon developed the first global reconstruction of Earth's tectonic plates. eos.org/articles/pod...
eos.org
Podcast: Plate Tectonics, the Theory That Changed Earth Science - Eos
Third Pod from the Sun talks with pioneering geophysicist Xavier Le Pichon about what it was like to be a young scientist challenging deeply held theories.
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Dr. Lucile Bruhat @seismolucy.bsky.social · 13/04/2025
"we explain the ”unusual” waveform signature of the Myanmar earthquake by a multiple, asymmetric bilateral rupture, involving boomerang-like back-rupture propagation and supershear." Preprint by Inoue, et al. about the Myanmar quake eartharxiv.org/repository/v... ⚒️🧪
eartharxiv.org
A multiple asymmetric bilateral rupture sequence derived from the peculiar tele-seismic P-waves of the 2025 Myanmar earthquake
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Anthony Lomax @alomaxnet.bsky.social · 02/04/2025
bbc.com/news/article...
bbc.com
Myanmar earthquake: BBC finds huge devastation and little help for survivors in Mandalay
Yogita Limaye is the first foreign journalist to enter Myanmar since a huge earthquake hit the war-torn country.
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Christophe Vigny @cvigny.bsky.social · 03/04/2025
Myanmar's terrible earthquake brings back old memories of fieldwork over there... a long time ago. We learned that the rupture could have been extremely long (~500 km), very fast (supershear?) and that ground liquefaction could have worsened the local effects. What else could have gone even worse?
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Christophe Vigny @cvigny.bsky.social · 02/04/2025
En 2000 nous avions réalisé un profil cinématique avec un GPS de haute précision (centimétrique) sur la voie ferrée depuis Pyin Oo Lwyin jusqu'à Monywa en passant par Mandalay et Sagaing. si on pouvait le reproduire on verrait le rebond élastique de la croute terrestre généré par le séisme du 28/03
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Jascha Polet @jascha.bsky.social · 01/04/2025
Many geophysicists have similar stories to tell. Mine involves a geyser and a gravimeter… ⚒️🧪🌋 www.instagram.com/stories/h0rd...
Screenshot of Instagram video of scientists removing a GPS station with the eruption in Iceland in the background
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Robin Lacassin @rlacassin.bsky.social · 02/04/2025
Forgot to tag ⚒️ 🧪 I take the opportunity to mention that ~3.2m is the offset localised on the visible fault rupture. It is possible that a proportion of more diffuse deformation must be added on both sides. This remains to be measured.
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Dr. Alice-Agnes Gabriel @inseismoland.bsky.social · 25/03/2025
Huge congratulations to my long-term friend and colleague Ahmed Elbanna @mcslabuiuc.bsky.social on becoming the next Director of SCEC! Super excited to be part of the next chapter of SCEC with Ahmed’s leadership, expertise, and deep passion for earthquake science www.scec.org?mailpoet_rou...
scec.org
Ahmed Elbanna SCEC Director-Designate
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David Ho @davidho.bsky.social · 30/03/2025
This is cool. The Guardian recreated a searchable climate future risk tool (wildfire, extreme heat, drought, hurricane, and coastal flood) for the US that was developed by FEMA but deleted by the Trump administration’s ‘climate’ purge.
theguardian.com
Trump’s ‘climate’ purge deleted a new extreme weather risk tool. We recreated it
The Guardian has recreated a searchable climate future risk tool developed by Fema but then deleted
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Stephen Hicks @seismo-steve.bsky.social · 28/03/2025
Preliminary back-projection which seems to confirm the finite fault model: www.linkedin.com/posts/hongju...
linkedin.com
For the M7.7 Myanmar earthquake occurred in 28 March 2025, we produced the… | Hongjun Si
For the M7.7 Myanmar earthquake occurred in 28 March 2025, we produced the following analysis results for emergency response: (1)Energy radiation from the…
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Dr. Judith Hubbard @judithgeology.bsky.social · 29/03/2025
The latest models from the USGS show slip, and associated strong shaking, extending much further to the south. Here I have plotted contours of estimated shaking over a map of population density. Note that the fault runs south through a narrow valley that is densely populated. ⚒️ 🧪 Myanmar earthquake
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Dr. Lucile Bruhat @seismolucy.bsky.social · 30/03/2025
I often use that image from Eric Dunham's website to show the difference between sub shear and supershear rupture pangea.stanford.edu/~edunham/res...
Figure that shows wavefronts for sub shear (left) and supershear (right) ruptures
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𝙈𝙞𝙣 𝙎𝙚𝙤𝙣𝙜 𝙎𝙚𝙤 @seismoseo.bsky.social · 30/03/2025
When the fault breaks underground, it often breaks at the speed less than S-wave (or shear wave) speed. This case is referred to as sub-shear rupture. However, if certain physical conditions are met, fault can break at the speed higher than S-wave speed. Such cases are called super-shear rupture.
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Patrick Marques @pmarques35.bsky.social · 30/03/2025
[2/3] La magnitude mesurée selon l’échelle de moment (Mw) dépend de la surface rompue, du déplacement et de la résistance des roches. L’échelle est logarithmique : un séisme de magnitude 7 génère 10× + de secousses qu’un de magnitude 6, et libère 32× plus d’énergie. #geography #earthquake #Myanmar
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Tom Gabrieli @tgabrieli.bsky.social · 29/03/2025
Preliminary analysis of strong motion sensors supports a long supershear rupture propagation www.linkedin.com/posts/zhe-ji...
linkedin.com
#myanmar #earthquake | Zhe Jia
Our latest analysis of seismic data from the M7.7 #Myanmar #earthquake yesterday may explain the strong shaking reached far beyond what we typically see for an…
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Tom Newby @tomnewby.co.uk · 29/03/2025
This is a pretty good article covering the structural aspects. My only addition would be that while flat slab construction is not the ideal system for seismic resistance, there is no reason it can't be used safely if properly designed. www.bbc.com/news/article...
bbc.com
Myanmar earthquake: What caused it and why did it make a building in Bangkok collapse?
The size of the earthquake and the length of the fault line it occurred on contributed to the devastation.
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Randall Munroe @xkcd.com · 26/03/2025
Rock Identification xkcd.com/3068
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Dr. Lucile Bruhat @seismolucy.bsky.social · 29/03/2025
EERI, through their Learning from Earthquakes Program, made a web page which collects news outlets and scientific resources about the Myanmar earthquake eeri.org/about-eeri/n...
eeri.org
EERI Response to March 28, 2025 M7.7 Mandalay, Myanmar (Burma) Earthquake
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Dr Robin George Andrews @squigglyvolcano.bsky.social · 28/03/2025
NEW: A catastrophic magnitude 7.7 earthquake shook Southeast Asia today, devastating entire neighbourhoods in cities throughout Myanmar—and the damage even extended as far as Thailand. What caused it? Why was it so powerful? Me for @sciam.bsky.social www.scientificamerican.com/article/what...
scientificamerican.com
Enormous Fault Rupture Causes Devastating Earthquake in Myanmar and Thailand
A magnitude 7.7 earthquake in Myanmar caused widespread shaking and likely considerable damage because of a lack of buildings built to withstand temblors
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J H Gurney @jhgurneyquakes.bsky.social · 28/03/2025
New USGS finite fault solution is intriguing. Bilateral rupture: northward rupture extending to the 2012 M6.8 rupture; southern rupture involving entire Meiktila segment. Areas of high slip (5-6m), with a lower slip (2-3m) area correlating with Mw 6.7 aftershock: earthquake.usgs.gov/earthquakes/...
earthquake.usgs.gov
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Robin Lacassin @rlacassin.bsky.social · 28/03/2025
USGS updated PAGER estimate. It's frightening. Zone of extreme damage is now shown elongated along Sagaing fault for >500km. 70% probability of fatalities > 10000 (~35% >100000). ⚒️ 🧪 These are probabilities, hopefully overestimated. In any case it's a massive disaster. Thoughts for the victims 💔
USGS map and diagram showing fatality probabilities and the area with extreme shaking and damage
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