Claudio Satriano

Volcanic features offshore Mayotte and seismic/hydrophone stations used. The network includes four onshore broad-band (BB) stations (black), one accelerometer (red) and multiple ocean-bottom hydrophones (OBH, orange). Offshore stations combine deployments MAYOBS1 (Feb–May 2019) and MAYOBS2 (May–Oct 2019). An asterisk (e.g. MOC*⁠) marks instruments redeployed across campaigns. P-T is Petite-Terre, east of Mayotte’s main island. Geomorphological boundaries and volcanic features (shaded areas in the bathymetry) follow N. Feuillet et al. (2021); V. Puzenat et al. (2022). Bathymetry is from MAYOBS campaigns (S. Jorry 2019).

Published in #GJI Geophysical Journal International: "Source parameters of very low frequency events during the Mayotte seismo-volcanic crisis (May 2018–January 2022)", Laurent et al. This is Fig. 1: please visit academic.oup.com/gji/article/... to read the paper. @royalastrosoc.bsky.social

Earthquake source parameters

Mw=7.6, NEAR EAST COAST OF HONSHU, JAPAN (Depth: 45 km), 2025/12/08 14:15:11 UTC - Full details here: http://geoscope.ipgp.fr/scripts/seismes/fiche.php?seis=us6000rtdt

#EarthquakeReport for M8.8 #Earthquake offshore of #Kamchatka #Russia

tied 8th largest magnitude temblor instrumentally recorded
@USGS_Quakes finite fault slip model 8+ meters slip
similar to 1952 M9

learn about tectonics here: earthjay.com?p=12053

earthquake.usgs.gov/earthquakes/...

Pyroclastic flows at Etna have been confirmed by INGV ⚒️🌋

Map of the Lötschtal showing the area affected by the glacier collapse. Blue colors show lost elevation, red areas elevation gains. The two most notable areas are the collapsed peak of Kleines Nesthorn and the collapsed glacier which are shown in deep blue with elevation loss of up to 128m and 51m respectively. The material slid down the mountain in an approximately 400m wide path and accumulated in a 2,5km long area on the valley floor which is up to 32m thick. The newly formed lake above the village of Blatten is also drawn in. The Map text reads: Kleines Nesthorn and Birchgletscher collapse / Blatten im Lötschental (VS) On Wednesday, May 28th, a2025, the Birchgletscher glacier collapsed under the weight of rock and debris following the partial collapse of the Kleines Nesthorn. Approximately 10 million cubic meters of debris flowed into the valley, burying large parts of the villages of Blatten and Ried. The debris also blocked the Lonza River, forming a small lake that destroyed several more houses in Blatten. Analyis Using Oblique imagery collected and provided by swisstopo on May 30th, 2025, a photogrammetric DEM was created and compared to the swissALTI3D DEM. The following volume change was measured in the affected area: Above Volume (m³): 11.2 Mio Below Volume (m³): 10.1 Mio

I also derived a new elevation model from the aerial images, allowing me to visualize the elevation change in the affected areas.
The rocks and debris in the valley are locally up to 32m thick and I estimate the total displaced volume is about 11 million cubic meters. #Blatten

My automated inversion of source spectrum captured the largest one (Mw 3.3), with an interesting peak at 10 Hz at all the recording stations 🤔. More details: ssphex.ipgp.fr/catalog/fr20.... The SspHex website: ssphex.ipgp.fr

"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... ⚒️🧪

This work was funded by: European Commission, Horizon Europe project 101058518 Geo-Inquire - European Plate Observing System EPOS - US National Science Foundation CSA Award No. 2310069 - New Zealand Government: Natural Hazards Commission Toka Tū Ake (NHC), GNS Science Te Pū Ao, Toitū Te Whenua Land Information New Zealand (LINZ), the National Emergency Management Agency (NEMA) and the Ministry of Business, Innovation and Employment (MBIE) - Australian National Collaborative Research Infrastructure Strategy (NCRIS)

Achieving Success in Seismic Network DOIs for data sharing and attribution!
The seismological community strategy is a success, citations improved and licensing is starting. In this paper Pedersen et al., propose recommendations for the way forward
Read now: seismica.library.mcgill.ca/article/view...

Map of Myanmar area showing sharp color change along the fault running roughly north-south. Red on west side where land moved northward.

NASA JPL ARIA project analysis of data from Copernicus Sentinel-2 optical and Sentinel-1 radar images measured the slip on the Sagaing Fault in Myanmar. Quick preliminary map. More details later. Fault ruptured about 500 km (300 miles) in the magnitude 7.7 […]

[Original post on mastodon.social]

Heat map of N-S displacement at Sagaing, Myanmar, before and after the March 2025 earthquake. The right east (right) side was displaced northward by about 2 m while the west side was displaced southward by about 4.5 m, indicating 6.5 m of N-S slip along a rupture that bisects the city.

Very (very) rough analysis indicates >6 m of slip.
I resolve pixel offset using DIC in experimental cm sized samples with speckle pattern, and never used it before on satellite images. However the dextral offset is pretty clear, and I trust my calibration so the slip magnitude should be about right.

First Satellite Images from Myanmar are available. Surface Deformation along the Sagaing Fault and the collapsed Ava.Bridge are visible in Downtown Sagaing. Pictures and Videos from the Surface Rupture have been reported since Friday.
Via browser.dataspace.copernicus.eu
#Myanmar #Earthquake

Earthquake source parameters

Mw=7.1, TONGA ISLANDS (Depth: 16 km), 2025/03/30 12:18:43 UTC - Full details here: http://geoscope.ipgp.fr/scripts/seismes/fiche.php?seis=us7000pntq

The fault involved in the M7.7 earthquake in #Myanmar is well known but the #Mandalay area didn't show much seismic activity so far.

Looking at the historical earthquake map and the preliminary USGS slip model below, it seems today's large earthquake filled partly the gap between 20 and 22 degrees North latitude.

Earthquake source parameters

Mw=7.9, MYANMAR (Depth: 35 km), 2025/03/28 06:20:54 UTC - Full details here: http://geoscope.ipgp.fr/scripts/seismes/fiche.php?seis=us7000pn9s

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

Rapport scientifique et technique d'étape sur le séisme de magnitude 4.1 du 18 mars 2025 au nord de Nice, commune de Coaraze, et la séquence sismique qui a suivi.

sismoazur.oca.eu/static/doc/s...

sismoazur.oca.eu#/specific_re...

Revised source inversions of the Ml4.1 and Ml3.8 shocks that occurred on March 18, 2025 just north of the city of Nice in southern France.

Earthquake source parameters

Mw=6.2, SOUTH OF PANAMA (Depth: 13 km), 2025/03/21 14:50:51 UTC - Full details here: http://geoscope.ipgp.fr/scripts/seismes/fiche.php?seis=us7000pllt

#EarthquakeReport #TsunamiReport for #OTD in 2011 M9.1 #Earthquake offshore of #Japan

generated 50+m of megathrust fault slip
produced local and transpacific #Tsunami

learn more
earthjay.com?p=9773

and @calconservation.bsky.social @cageosurvey.bsky.social
storymaps.arcgis.com/stories/d230...

bsky.app/profile/geos...

(Shameless ad for our Geoscope earthquake service 😉)

🌀 Les stations de l'OVPF-IPGP n'ont pas été épargnées par les vents cycloniques de #Garance: stations détruites, panneaux solaires brisés, antennes cassées, portes de coffret arrachées...
👨‍🔧Les équipes restent mobilisées pour remettre en état ce réseau et évacuer prochainement les stations détruites.

And now for something completely different:
bsky.app/profile/wear...

@alomaxnet.bsky.social (Lomax) uses aftershocks as virtual observations at the depth of rock deformation surrounding an earthquake rupture to image in 3D the fault slip during the earthquake.
Read more:
seismica.library.mcgill.ca/article/view...

🌀Situation post-cyclone #Garance. Grâce à la forte mobilisation des équipes de l’OVPF-IPGP, l’observatoire a de nouveau le contact avec 65% de ses stations sur le terrain (contre 15% à la fin du cyclone).
L'OVPF-IPGP reste mobilisé pour remettre en état ce réseau le plus rapidement possible.

Un séisme de magnitude 5.0)a été enregistré le dimanche 02 mars 2025 à 20:01 (heure locale) et identifié d'origine Tectonique. L'épicentre a été localisé à 57 km à l'est-nord-est de Trinité, à 46 km de profondeur.
Si vous avez ressenti ce séisme, merci de témoigner sur www.franceseisme.fr

NLL-SSST-coherence high-precision earthquake location catalog for the 2025 #Santorini #Amorgos #earthquake swarm.
Based on data from Institute of Geodynamics of the National Observatory of Athens (NOA-IG).
Download & details: doi.org/10.5281/zeno...

Di Giacomo et al. had a fresh look at the time-dependent uncertainty related to early analog instrument picks. Their findings translate into a more reliable location uncertainty estimation. @iscseism.bsky.social

Read now: seismica.library.mcgill.ca/article/view...

Auto solution FMNEAR (Géoazur/OCA) with regional records for the M 4.0 – SOUTH SPAIN, 2025-02-27 02:29:32.3 UTC (Loc EMSC used to trigger inversion)

sismoazur.oca.eu#/focal_mecha...
emsc-csem.org/Earthquake_d...

Thanks to the seismic records from Spain and Portugal provided through IGN and IRIS