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Dr. Lucile Bruhat

@seismolucy.bsky.social

3.8K followers 680 following 54 posts

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

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Dr. Lucile Bruhat @seismolucy.bsky.social · Dec 15

Hello to old and new comers! Thank you for following me. Here is a short intro if you don't know me: I am Lucile Bruhat or seismolucy, I work in Natural Catastrophe risk management at the AXA Group. After a PhD in Geophysics (specialized in earthquake physics) and few years in academia,

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Reposted by Dr. Lucile Bruhat

Brian McNoldy @bmcnoldy.bsky.social · Aug 22

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%.
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Brian McNoldy @bmcnoldy.bsky.social · Aug 22

The track history with some selected satellite images are shown here.
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Roland Pease @peaseroland.bsky.social · Jul 31

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 World Service - Science In Action, Getting ahead of tsunamis

The scientist behind the pacific tsunami warning and the decades of work before it.

www.bbc.co.uk

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Brandon Bishop @brandontbishop.bsky.social · Jul 30

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 · Jul 30

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 · Jul 30

www.lemonde.fr/les-decodeur...

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.

www.lemonde.fr

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Dr. Lucile Bruhat @seismolucy.bsky.social · Jul 30

⚒️🧪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

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.

www.nationalgeographic.com

Reposted by Dr. Lucile Bruhat

GFZ Helmholtz-Zentrum für Geoforschung @gfz.bsky.social · Jul 30

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 · Jul 30

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...

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.

www.nationalgeographic.com

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Reposted by Dr. Lucile Bruhat

Dr Robin George Andrews @squigglyvolcano.bsky.social · Jul 30

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.)

Andrea Thompson @andreatweather.bsky.social · Jul 30

Another earthquake story from @sciam.bsky.social by the always-excellent @squigglyvolcano.bsky.social explaining why the tsunami from the Russia quake wasn't as huge as the one from the 2011 Japan quake, for example. 🧪

Why the Russia Earthquake Didn't Cause a Huge Tsunami

Russia's magnitude-8.8 earthquake spawned serious tsunami warnings, but waves have been moderate so far. Here's the geological reason why

www.scientificamerican.com

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Dr. Alice-Agnes Gabriel @inseismoland.bsky.social · Jul 30

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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Daniel Swain @weatherwest.bsky.social · Jul 30

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 · Jul 30

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*

https://geofon.gfz-potsdam.de/eqexplorer/events/gfz2025oudg/general

##GEOFON ##GFZ ##earthquake ##magnitude

Map showing the earthquake of 2025-07-30 in Near East Coast of Kamchatka

Reposted by Dr. Lucile Bruhat

Seismica @weareseismica.bsky.social · Jul 6

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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Dr. Lucile Bruhat @seismolucy.bsky.social · Jul 26

Nice job @quakes-from-space.bsky.social !

Reposted by Dr. Lucile Bruhat

Nature Geoscience @natgeosci.nature.com · Jul 25

⚒️ 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...

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...

www.nature.com

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Boris Behncke @borisetneo.bsky.social · Jun 2

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 · May 12

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:
🧵⚒️🧪

Douwe van Hinsbergen @vanhinsbergen.bsky.social · May 12

This is mind-blowing! I have never seen footage of the slip that occurs during an earthquake! Here you see the slip that occurred during the Myanmar earthquake. 🤯

www.youtube.com/watch?v=77ub...

First fault rupture ever filmed. M7.9 surface rupture filmed near Thazi, Myanmar

YouTube video by 2025 Sagaing Earthquake Archive

www.youtube.com

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Tom Gabrieli @tgabrieli.bsky.social · Apr 11

#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 · Apr 25

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/...
⚒️🧪

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...

www.pnas.org

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Jascha Polet @jascha.bsky.social · Apr 23

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 · Apr 19

This not going to end well.....

Randall Munroe @xkcd.com · Apr 19

Anchor Bolts xkcd.com/3078

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Dr. Wendy Bohon @drwendyrocks.bsky.social · Apr 14

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 · Apr 14

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 · Apr 3

theconversation.com/seisme-au-my...

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.

theconversation.com

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