Baptiste Gombert

Magnitude 6 #earthquake near Jalalabad in E #Afghanistan, close to the border with Pakistan.
Mechanism is thrust on a shallow SE or NW dipping fault.
General context is the India-Asia collision which placed the region under a N-S shortening. ⚒️

We are entering a new era for tsunami observations and model validation-- The SWOT era! Thanks a lot @baptistegomb.bsky.social for reaching out, this was a fun collaboration. Also great working with @diegosismologo.bsky.social and @valah.bsky.social. @haskoliislands.bsky.social

Superb observation by the SWOT altimetry satellite of the July 30 #tsunami. Data acquired ~1h after the M8.8 Kamchatka earthquake show the waves propagating across the Pacific with a great agreement with @rocangel.bsky.social's model!
[more here](www.aviso.altimetry.fr/fr/missions/...)
#CNES #CLS

Earthquake sequences of Kamchatka this month. Pink is M8.8 aftershock sequence.

Macinnes et al. (2010) rupture zones

The aftershock zone of today’s M8.8 Kamchatka megathrust #earthquake is comparable to the rupture area of the 1952 rupture zone from Macinnes et al. (2010). At a rate of 8 cm/year, the accumulated slip of 6 m since 1952 matches with the preliminary rupture model of today’s earthquake pretty well. 🧪⚒️

M8.8 earthquake strikes offshore Kamchatka A dangerous subduction megathrust ruptures once again

⚒️ 🧪

A M8.8 earthquake just ruptured the subduction zone offshore Russia’s Kamchatka peninsula. This is one of the world’s truly huge earthquakes, and a triggered tsunami is currently traveling across the Pacific ocean.

This same fault ruptured on July 20th in a M7.4, and last August in a M7.1.

Simulated propagation of tsunami generated by Kamchatka M8.8 earthquake. Generated by NCDR, Taiwan. 🧪⚒️⚛️

Canicule intense dès juin, mais c’est l’écologie qui est punitive. Il est urgent… de détricoter les mesures environnementales.

Les sdf, les pauvres, les malades, les retraités, les enfants, les agriculteurs, les ouvriers, victimes de la chaleur, comptent donc si peu pour nos parlementaires?

🤢🤢🤢

Delighted to see our @NERCscience @EvoFlood project research on changing flood hazard and risk profiled by @theAGU 💜 @lborouniversity

eos.org/research-spo...

Apparently surface rupture during the Myanmar 2025. I'm very surprised by the weak shaking along the rupture. I'm not sure if this is the main rupture (I would say no - nonetheless, VERY COOL). Author unknown, location Thazi (to be confirmed)

So not "altimetry-on-river" related as it is an output of my previous job, but worth sharing nonetheless :)

In this paper we discuss the origin of this speckle and strategies that can be used to characterize and remove its energy spectrum, ultimately leading to better ocean wave spectra retrieval. DM me for a copy!

CFOSAT is dedicated to the measurement of directional spectra of ocean waves, but like any radar it is strongly affected by speckle noise.

Our paper on the speckle noise spectrum of the SWIM instrument aboard the CFOSAT oceanography satellite is online on IEEE TGRS!
ieeexplore.ieee.org/document/109...

Sentinel-2 reveals the surface deformation after the 2025 #Myanmar #earthquake www.cesbio.cnrs.fr/multitemp/se...

Left: excerpt of the satellite image. Different fields, dirt roads and paths, houses are visible. The earthquake rupture is visible as darker lines cutting across fields and roads. A clear lateral offset of a dirt road is also visible. To the right, same image with the earthquake rupture mapped in red.

High resolution MAXAR satellite image reveals the #Myanmar #earthquake surface rupture north of the town of Sagaing. It is close to epicenter and N tip of the >400km long rupture.

Right-lateral offset of ~3.2m is clearly illustrated by the distorsion and lateral shift of a dirt road striking E-W.

Updated processing from Sentinel-1 data over the #MyanmarEarthquake. Here are azimuth and range offsets, displacements in the indicated lines-of-sight (LOS). The azimuth offsets' LOS is better aligned with the fault strike, hence its larger displacement. Rupture extends ~400 km south of Mandalay.

Screenshot of Myanmar M7.7 surface rupture map service

Remote surface rupture observations for the M7.7 2025 Myanmar earthquake - soft rollout!

doi.org/10.5066/P1RY...

Simple fault trace and slip distribution from pixel tracking, high-res from available imagery. Watch for updates!

⚒️ USGS and collaborators effort led by @nadinegrr.bsky.social 🙏

Update: Preliminary coseismic displacements of 2025 Myanmar earthquake from @CopernicusEU @ESA #Sentinel2 images by using #CosiCorr, processed by @NTU_TW GEOG
#Copernicus

1. Rupture propagated from N to S
2. Max. offset >4m
3. Rupture length ~500km

The descending interferogram from Sentinel-1 (20250319-20250331) suggests that the earthquake rupture extends to 18.7 degrees and may have reached further south. More data in the next few days will reveal the full length of the rupture from this devastating earthquake.

Updates on the M7.7 Myanmar earthquake An unusually long, possibly supershear rupture

🧪⚒️

Two days after the M7.7 earthquake in Myanmar, what have we learned?

Rapid seismological analyses shared by scientists suggest that the rupture was both longer and faster than expected - two factors that could have increased damage.

Read more: earthquakeinsights.substack.com/p/updates-on...

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

Seismicity map of the Myanmar area generated by Jascha Polet using GMT and a myriad of earthquake catalogs

A historical seismicity map shows several #earthquakes of similar size to today’s M7.7 in Myanmar occurred in the region in the early 20th century, but this section of the Sagaing fault probably hasn’t ruptured since 1839 🧪⚒️

The revised focal mechanism is RLSS. Wikipedia has a nice map with the fault sections on it and Ray thinks that is was the section that hasn’t ruptured since 1839.

Surface waves are still rolling through on my broadband in NZ:

First slip map for the Mw 7.8 Myanmar earthquake. Propagation of rupture towards the South. Slipnear method (Géoazur/OCA).

Vous avez toujours les mots justes. Merci pour votre prise de parole, et votre travail de communication de manière générale

Map of region of today’s M7.6 quake near the Cayman Islands with the current sequence in purple (generated by Jascha Polet)

I made a quick map of historical seismicity for the region of today’s M7.6 #earthquake near the Cayman Islands. This left lateral strike slip event occurred on a fault system that produced a few similar events in size & mechanism in the last decade.
(Good to see that USGS NEIC is still online!)🧪⚒️

Some beauty for the eyes

Fingers crossed for you and the few people I still know over there... Stay safe Eric!

Launch update: #NISAR, a powerful Earth-observing satellite, is targeting a likely launch date in March 2025.

The joint @nasa-@IsrO mission will scan nearly all of Earth’s land and ice surfaces to measure changes down to fractions of an inch: https://blogs.nasa.gov/nisar