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Soumaya Latour

@clipclopsoum.bsky.social

Sismologue

56 Followers  |  419 Following  |  23 Posts  |  Joined: 13.06.2024  |  1.9297

Latest posts by clipclopsoum.bsky.social on Bluesky

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L'analyse de la propagation en surface du séisme de Mandalay en 2025 rendu possible grâce à une seule caméra de vidéosurveillance ! Une équipe de scientifiques de plusieurs laboratoires du CNRS vient de réaliser une analyse précise de la source du séisme de

#RésultatScientifique

En mars 2025, un séisme dévastateur a frappé le Myanmar le long de la faille de Sagaing près de Mandalay. Une équipe de scientifiques vient de réaliser une analyse précise de la source du séisme grâce à l’analyse d’images d’une caméra de vidéosurveillance.

➡️ bit.ly/4p2rvb6

13.11.2025 10:52 — 👍 5    🔁 2    💬 0    📌 0
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COP30 : « A l’heure où les scénarios climatiques s’aggravent, les incohérences de la France et de l’UE ne sont plus tenables » TRIBUNE. Dans une tribune au « Monde », un collectif de doctorants et de doctorantes en sciences de la Terre et du climat dénonce l’hypocrisie de politiques internationales qui prétendent mener la tra...

An Op-ed in "Le Monde" by a group of doctoral students in Earth and climate sciences denounces the hypocrisy of international policies that claim to lead the ecological transition but "undermine, decision after decision, the means to achieve it". ⚒️ 🧪

in FR: www.lemonde.fr/idees/articl...

12.11.2025 19:15 — 👍 7    🔁 1    💬 0    📌 0
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#COP30 🌎 L’Europe continentale se réchauffe plus vite que le reste du globe. D’ici 2050, le climat de Londres sera similaire à celui de Barcelone aujourd’hui. 🌡️

👉 www.cnrs.fr/fr/actualite/eu...

10.11.2025 10:02 — 👍 40    🔁 38    💬 2    📌 7
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The underwater seismometer network is so great, as evidenced from yesterday's EQ off-Tohoku.
Reposting unofficial visualization by x.com/kotoho76/sta...

10.11.2025 06:56 — 👍 161    🔁 66    💬 3    📌 10
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In the Basin & Range Province, GPS measurements reveal prolonged extension—from infinitesimal motion in eastern Utah to about 6.5 mm/year in western Nevada. The effects of this slow, steady stretching can be observed in the presence of nearly parallel mountain ranges and valleys in the landscape.

07.11.2025 10:28 — 👍 18    🔁 8    💬 1    📌 0
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Le tremblement de terre en Birmanie en mars a permis d’affiner les modèles des scientifiques En plus d’être particulièrement étendu, ce séisme a présenté un front en « supercisaillement », lié à une vitesse de rupture très élevée. Dans « Science », une édition spéciale présente une série d’ar...

📰 Dans @lemonde.fr, notre collègue Harsha S. Bhat (laboratoire de #géologie ENS) explique comment l'étude du tremblement de terre en Birmanie a permis d'affiner les modèles sismiques.
www.lemonde.fr/sciences/art...

06.11.2025 14:11 — 👍 4    🔁 4    💬 1    📌 0
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Recréer en laboratoire des séismes pour mieux comprendre leur diversité : le pari de @geocarolina.bsky.social.
Rencontre avec la géologue récompensée par une ERC Starting Grant 2025.
👉 www.ens.psl.eu/actualites/r...

07.11.2025 09:45 — 👍 4    🔁 3    💬 0    📌 0
Graph showing the fit between the best model and the measured slip and slip-rate functions.

Graph showing the fit between the best model and the measured slip and slip-rate functions.

Graph showing the shear strength as a function of slip corresponding to the best model. It is decreasing almost linearly from 6MPa to 1MPa over 2.5m of slip.

Graph showing the shear strength as a function of slip corresponding to the best model. It is decreasing almost linearly from 6MPa to 1MPa over 2.5m of slip.

We obtain a cohesive zone length of 70% of the slip-pulse length and a rupture velocity of 90% of the shear-wave speed. This correspond to an estimated energy release rate of 5.8MJ/m^2. This is the first time this key parameter of rupture dynamics is measured directly on fault.

06.11.2025 10:53 — 👍 0    🔁 0    💬 0    📌 0

This model allows to compute the particle velocity. So we inverted for the local rupture velocity and the size of the cohesion zone, by adjusting the computed slip-rate to the measured slip-rate.

06.11.2025 10:53 — 👍 0    🔁 0    💬 1    📌 0

Finally, we tested another widely used slip-pulse model. In this model, the shape of the stress profile within the slip-pulse portion of the fault is imposed: There is a cohesion zone in which the stress linearly decreases with the distance from the tip, followed by a constant stress area.

06.11.2025 10:53 — 👍 0    🔁 0    💬 1    📌 0
Graph of shear stress change (on fault) as a function of slip.  The curve is mostly a decreasing function, decreasing from 3MPa to -2.5 MPa over the course of 2.9m. There are small changes of the slope. The area under the curve correspond to the breakdown work and is equal to 7.7MJ/m^2. We made the hypothesis of a steady-state rupture velocity equal to 90% the shear wave velocity.

Graph of shear stress change (on fault) as a function of slip. The curve is mostly a decreasing function, decreasing from 3MPa to -2.5 MPa over the course of 2.9m. There are small changes of the slope. The area under the curve correspond to the breakdown work and is equal to 7.7MJ/m^2. We made the hypothesis of a steady-state rupture velocity equal to 90% the shear wave velocity.

Then we used the interpolated slip-rate function as an input for a steady-state propagating pulse elastodynamic model, which allowed to estimate the stress-slip history and the breakdown work.

06.11.2025 10:53 — 👍 0    🔁 0    💬 1    📌 0
A. Graph showing the slip as a function of time. The curve is a smooth ramp that grows from 0 to 3m in 1.4s

A. Graph showing the slip as a function of time. The curve is a smooth ramp that grows from 0 to 3m in 1.4s

B. Graph showing the slip rate as a function of time. The curve grows from 0 to 3.5 m/s in approx 0.6s then decreases to 0 in approximately 1 s.

B. Graph showing the slip rate as a function of time. The curve grows from 0 to 3.5 m/s in approx 0.6s then decreases to 0 in approximately 1 s.

We have tracked the motion of some landmarks across the fault to measure the slip function and the slip rate function:

06.11.2025 10:53 — 👍 0    🔁 0    💬 1    📌 0

The accepted author manuscript is here: arxiv.org/abs/2505.15461

06.11.2025 10:53 — 👍 2    🔁 2    💬 1    📌 0
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Direct estimation of earthquake source properties from a single CCTV camera We present a direct measurement of the slip-rate function from a natural coseismic rupture, recorded on 28 March 2025, during the moment magnitude (Mw) 7.7 Mandalay earthquake (Myanmar). This measurem...

Remenber this stunning video of the surface rupture of the Mandalay earthquake?
www.youtube.com/watch?v=77ub...
Our analysis of the video, and its implication for earthquake source mechanics, has just been published in Science
www.science.org/doi/abs/10.1...

06.11.2025 09:42 — 👍 1    🔁 1    💬 0    📌 1
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Powerful 6.3 magnitude earthquake shakes northern Afghanistan, killing at least 10 people Afghan officials say a powerful 6.3-magnitude earthquake that shook northern Afghanistan overnight killed at least 10 people and injured more than 260.

A powerful 6.3-magnitude earthquake shook northern Afghanistan before dawn Monday, killing at least 10 people and injuring 260 others, an Afghan health official said.

03.11.2025 05:00 — 👍 76    🔁 31    💬 3    📌 4
A Buddha statue lies face down in rubble in this photo taken a week after the 28 March earthquake in Mandalay, Myanmar.

A Buddha statue lies face down in rubble in this photo taken a week after the 28 March earthquake in Mandalay, Myanmar.

The 28 March earthquake in Mandalay, Myanmar, caused fatalities across a broad swath of the country and beyond.

This special issue of Science features papers exploring the risk and reasons behind the anomalously fast, sustained rupture. https://scim.ag/3JnMTbO

30.10.2025 18:05 — 👍 35    🔁 13    💬 0    📌 0
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Why did the Road Cross the San Andreas Fault? 23 Years of Geologic Change (a new Update) 2002 I've been leading geology field studies trips to lots of places in the American West for 37 years and started to take digital pictu...

geotripper.blogspot.com/2025/10/why-... I've been monitoring a road crossing for 23 years now, documenting the effect of fault creep along the San Andreas near Pinnacles National Park. Here's how it looked last weekend! #sanandreasfault

13.10.2025 20:05 — 👍 32    🔁 7    💬 4    📌 1
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Seismic stations across North America detected the earthquake waves from the M7.4 earthquake in the Philippines. 🧪

ds.iris.edu/spud/gmv

10.10.2025 16:30 — 👍 47    🔁 20    💬 1    📌 1
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#Job
L'OSUG recrute un(e) Ingénieur(e) en gestion de bases de données et développement d’applications cartographiques

► Offre : www.osug.fr/l-institut/t...

► Fin des candidatures : 29 septembre 2025

@ugrenoblealpes.bsky.social @ird-fr.bsky.social
@cnrs-insu.bsky.social @cnrsalpes.bsky.social

11.09.2025 13:48 — 👍 2    🔁 1    💬 0    📌 0
16th Street in NW DC, the road filled with demonstrators carrying signs and marching, with the trees of Malcolm X Park visible in e background.

16th Street in NW DC, the road filled with demonstrators carrying signs and marching, with the trees of Malcolm X Park visible in e background.

It was just block after block of people coming from Malcolm X Park headed downtown. Lots of energy despite the heat, and cheers from passersby, as well as church bells ringing in support.

06.09.2025 19:04 — 👍 2212    🔁 509    💬 17    📌 24
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The crowd has no beginning and no end as it begins its march to the White House

06.09.2025 16:27 — 👍 3911    🔁 895    💬 32    📌 46
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« Global Sumud Flotilla » : suivez le départ de la flotille pour briser le blocus de Gaza Dimanche, la flotille partira de Barcelon en direction de Gaza. À son bord, Bruno Gilga, un militant de la Fraction Trotskyste, à laquelle appartient RP. Suivez les préparatifs du départ en direct dep...

« Global Sumud Flotilla » : suivez le départ de la flotille pour briser le blocus de Gaza www.revolutionpermanente.fr/Global-Sumud...

31.08.2025 04:40 — 👍 160    🔁 80    💬 3    📌 2

Vous êtes fonctionnaire ou assimilé et vous touchez l'allocation d'éducation de l'enfant handicapé (AEEH), savez-vous que vous avez le droit à un complément financier, l'APEH, pour faire face aux dépenses liées au handicap de votre enfant ? Maintenant, oui 😉

18.08.2025 09:00 — 👍 9    🔁 8    💬 2    📌 1

Famille vérifiée à l’instant. La cagnotte avance peu, et le compte reçoit peu de soutien sous forme de partage, donc merci d’au moins partager et follow si vous ne pouvez pas donner

16.08.2025 17:54 — 👍 39    🔁 97    💬 0    📌 1

For each +1 in magnitude, the rupture duration is approximately multiplied by 3, so if a magnitude 6.8 last approx 15 s, a 8.8 is 9 times longer: ~135s more than 2 minutes. And then there are effects due to the wave propagation and how far you are from the epicenter.

31.07.2025 16:54 — 👍 0    🔁 0    💬 0    📌 0
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🔴 Le pire scénario de famine est en cours à Gaza, selon le rapport implacable de l'IPC.

La catastrophe est entièrement causée par le siège génocidaire d’Israël.

Il faut des MESURES RESTRICTIVES IMMÉDIATES à l'égard d'Israël, la fin du blocus et l’entrée libre de l’aide.

29.07.2025 09:33 — 👍 19    🔁 24    💬 1    📌 2
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Gaza suffering man-made mass starvation, says WHO chief Tedros Adhanom Ghebreyesus issues warning, as more than 100 aid groups urge Israel to ease blockade

Gaza is suffering man-made mass starvation caused by the blockade of aid into the territory, the head of the World Health Organization says. More than 100 agencies are urging Israel to let in supplies to alleviate the crisis.
www.theguardian.com/world/2025/j...

25.07.2025 04:31 — 👍 14    🔁 10    💬 4    📌 1

@clipclopsoum is following 20 prominent accounts