Dr. Lucile Bruhat

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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The track history with some selected satellite images are shown here.
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BBC World Service - Science In Action, Getting ahead of tsunamis The scientist behind the pacific tsunami warning and the decades of work before it.

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...

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.

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.

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/les-decodeur...

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.

⚒️🧪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

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).

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.

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.

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...

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.)

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

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!

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

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

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.

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

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...

⚒️ 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...

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)

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:
🧵⚒️🧪

A rock wall next to a road. The wall show tightly folded rock layers

#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

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...

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/...
⚒️🧪

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. ⚒️🧪

This not going to end well.....

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/...

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.

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.
🧪⚒️

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/seisme-au-my...

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.

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...

"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... ⚒️🧪

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.

bbc.com/news/article...

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?

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