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Bertrand Delouis

@bertranddelouis.bsky.social
177 followers 88 following 74 posts

Seismologist. Geoazur lab. Observatoire de la Côte d'Azur (OCA) Université Côte D'Azur (UniCA) France

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Bertrand Delouis @bertranddelouis.bsky.social · 04/07/2026
Updated slip model obtained using regional seismological data alone (stations in Colombia, the Caribbean, etc.) for the Venezuela earthquake of June 24, 2026, considered here as a single event. More text detail on Linkedin : www.linkedin.com/feed/update/...
linkedin.com
Updated slip model obtained using regional seismological data alone (stations in Colombia, the Caribbean, etc.) for the Venezuela earthquake of June 24, 2026, considered here as a single event… | Bert...
Updated slip model obtained using regional seismological data alone (stations in Colombia, the Caribbean, etc.) for the Venezuela earthquake of June 24, 2026, considered here as a single event. Comp...
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Dr. Eric J. Fielding, PhD @ericjfielding.bsky.social · 28/06/2026
NASA-ISRO SAR (NISAR) satellite imaged Venezuela June 25. NISAR SAR interferometry (InSAR) enabled calculation of surface displacement. Displacements have red tones for east and blue tones for west, with white in middle near-zero over fault rupture. Fault ruptured far to east under ocean. #venezuela
Map of north-central Venezuela with NISAR line-of-sight displacement map shown in false color varying from red to white to blue. Red land moved east (towards satellite) and blue land moved west. InSAR only measures land, so ocean and lakes have no measurements. Background map from Google satellite natural-color images on land and bathymetry in ocean.
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Gareth Funning @gfun.earth · 25/06/2026
Composite plot of the two coseismic interferograms (Sentinel-1, from Copernicus) with the USGS epicenters of the two earthquakes and faults from GEM. The shoreline San Sebastián fault lines up with the fringes in the west and is probably the fault responsible.
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Lea Pousse Beltran @ssoupssoup.bsky.social · 25/06/2026
A major seismic event struck Venezuela yesterday, with magnitudes reported as Mw 7.2 and Mw 7.5 by the USGS. According to several seismologists, due to the complexity of the seismic signal, these may in fact represent a single earthquake event (earthquakeinsights.substack.com/p/catastroph...).
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Earthquake information from Geoscope Observatory @geoscope-ipgp.bsky.social · 25/06/2026
Mw=7.8, NEAR COAST OF VENEZUELA (Depth: 12 km), 2026/06/24 22:04:32 UTC - Full details here: geoscope.ipgp.fr/scripts/seismes/fi…
Earthquake source parameters
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Bertrand Delouis @bertranddelouis.bsky.social · 25/06/2026
Auto slipmap with regional records (SLIPNEAR method, Géoazur/OCA) M 7.5 - VENEZUELA - 2026-06-24 22H04 UTC (MT solution from GFZ) A single earthquake is assumed (doublet not separated) EW Rupture plane identified at 100% Rupt propagation largely to the east Thanks to seismic records through IRIS
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Bertrand Delouis @bertranddelouis.bsky.social · 08/06/2026
Automatic slip model for the M7.8 South Mindanao Philipppines earthquake,June 7, 2026 (SLIPNEAR method, Géoazur/OCA) Due to the lack of accessible stations in Philippines, the model is moderatly constrained, but a clear rupture propagation to the south is found. Result for the East dipping plane.
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Bertrand Delouis @bertranddelouis.bsky.social · 14/04/2026
Auto solution FMNEAR (Géoazur/OCA) with regional records for the M 5.7 - NEVADA, USA 2026-04-14 01:29:11 UTC (Loc EMSC used to trigger inversion). emsc-csem.org/Earthquake_d... Thanks to the seismic records provided by NCEDC, SCEDC, and IRIS
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Bertrand Delouis @bertranddelouis.bsky.social · 02/04/2026
Auto solution FMNEAR (Géoazur/OCA) with regional records for the M 4.6 – Near San Jose, California, 2026-04-02 08:41:24.7 UTC (Loc EMSC used to trigger inversion). emsc-csem.org/Earthquake_d... Thanks to the seismic records provided by SCEDC
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Anthony Lomax @alomaxnet.bsky.social · 09/12/2025
Preliminary NLL-SC relocation of M7 Dec 6 #Alaska #Yukon Hubbard Glacier #earthquakes and seismicity since 2020. Hubbard events fall in void in earlier seismicity, show clear SE-NW trend, and suggest main rupture was ~vertical (strike-slip?) at SE and complex or dipping (toward NE??) to the NW.
Epicenter map of NLL-SSST-coherence relocated seismicity for the period 2020 to 8 Dec 2025 in the area surrounding the M7 Dec 6 #Alaska #Yukon Hubbard Glacier #earthquake sequence. Purple lines show Quaternary faults from https://www.usgs.gov/programs/earthquake-hazards/faults
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Bertrand Delouis @bertranddelouis.bsky.social · 08/12/2025
Auto slipmap with regional records (SLIPNEAR method, Géoazur/OCA) M 7.6 Japan Earthquake, 2025-12-08 14:15:10 (UTC) Plane shallow dipping to the East (strike 179) shown. Rupt very concentrated around the hypocenter, far from and much deeper than the trench. Thanks to seismic records through IRIS
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John Cassidy @earthquakeguy.bsky.social · 07/12/2025
Today's shallow M7 #earthquake near the Yukon-Alaska border has produced more than 60 #aftershocks (some as large as M5.1) during the first 5 hours. Live #shaking from a seismic station at Haines Junction (YT) shows a steady stream of aftershocks: www.earthquakescanada.nrcan.gc.ca/stndon/wf-fo... ⚒️🧪
A USGS map of aftershocks (first 5 hours) show more than 60 located, some as large as M5.1. Coloured dots indicate the age of the events. These extend in a NW-SE direction along a 50-km-long fault.
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Bertrand Delouis @bertranddelouis.bsky.social · 06/12/2025
Auto slipmap with regional records (SLIPNEAR method, Géoazur/OCA) M 7.0 SOUTHERN YUKON TERRITORY, CANADA Earthquake, 2025-12-06 20:41:49 (UTC) FM USG Plane oriented NW-SE (dipping to the NE) shown. Rupt propagation mainly to the NW, surface rupture likely. Thanks to seismic records through IRIS
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Bertrand Delouis @bertranddelouis.bsky.social · 06/12/2025
Auto solution FMNEAR (Géoazur/OCA) with regional records for the M 7.0 - Yakutat, SOUTHERN YUKON TERRITORY, CANADA Earthquake, 2025-12-06 20:41:49 (UTC) Thanks to the seismic records provided through IRIS
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Bertrand Delouis @bertranddelouis.bsky.social · 01/12/2025
Annot greystones, south of France
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Anthony Lomax @alomaxnet.bsky.social · 21/11/2025
New! We study the disruptive 2025 earthquake unrest near #Santorini using machine-learning derived seismicity as virtual stress meters at depth. We show the unrest was due to a magma dike intrusion, imaging in detail a complex, rebounding process of dike propagation. www.science.org/doi/10.1126/...
science.org
The 2025 Santorini unrest unveiled: Rebounding magmatic dike intrusion with triggered seismicity
Magmatic intrusion in Earth’s crust can lead to hazardous volcanic eruptions, but the physical processes involved remain largely hidden from direct observation. We used machine learning–derived seismi...
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Bertrand Delouis @bertranddelouis.bsky.social · 28/10/2025
Auto slipmap with regional records (SLIPNEAR method, Géoazur/OCA) M 6.0 - Western Turkey - 2025-10-27 19:48:28 (UTC) earthquake Rupture plane not selected in an automated way. The two planes are shown. The focal mechanism used is from GFZ
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Bertrand Delouis @bertranddelouis.bsky.social · 27/10/2025
Auto slipmap with regional records (SLIPNEAR method, Géoazur/OCA) M 6.5 - E of Beauséjour, Guadeloupe - 2025-10-27 12:38:40 (UTC) Rupture plane not selected in an automated way. The two planes are shown.
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Observatoire volcanologique et sismologique de Guadeloupe @ovsg.bsky.social · 27/10/2025
[Séisme ressenti] Un séisme a été enregistré le lundi 27 octobre 2025 à 12:38 heure locale. ➡️ magnitude 6.6 ± 0.3 ➡️ type Tectonique 👉Si vous l'avez ressenti, merci de nous aider en témoignant sur www.franceseisme.fr
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Earthquake information from Geoscope Observatory @geoscope-ipgp.bsky.social · 27/10/2025
Mw=6.5, LEEWARD ISLANDS (Depth: 13 km), 2025/10/27 12:38:40 UTC - Full details here: geoscope.ipgp.fr/scripts/seismes/fi…
Earthquake source parameters
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Dr. Alice-Agnes Gabriel @inseismoland.bsky.social · 07/10/2025
Do Coupled Megathrusts Rupture? In our new preprint, Bar Oryan and I present the first global analysis of the relationship between kinematic geodetic coupling and earthquake slip models across 12 subduction zones and 61 megathrust earthquakes. eartharxiv.org/repository/v...
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GFZ Helmholtz-Zentrum für Geoforschung @gfz.bsky.social · 25/09/2025
Our latest study in Nature, together with colleagues from @geomarkiel.bsky.social and universities from Greece, shows what happened beneath Santorini earlier this year when tens of thousands earthquakes shook the islands and the seafloor. It was magma. We also have 1/2 www.gfz.de/en/press/new...
gfz.de
Magma displacement triggered tens of thousands of earthquakes
Magma displacement triggered tens of thousands of earthquakes: Analysis of the swarm of earthquakes around Santorini in early 2025 reveals causes and development of the seismic crisis
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Julie Elliott @julieelliott.bsky.social · 16/07/2025
Quick map of M7.3 earthquake offshore the Alaska Peninsula. Today's earthquake (green) has a very similar focal mechanism to the M7.8 2020 Sand Point event, which was dominantly strike-slip but caused a tsunami. Based on depths of mainshock and early aftershocks, could be an upper plate event. ⚒️
Map showing earthquakes and past ruptures along the Alaska Peninsula.  Five large earthquakes (7.2-8.2) have occurred since July 2020.  Green focal mechanism shows a healthy amount of strike slip and marks today's event.  Red contours show past rupture areas for large earthquakes.  Black contours show 1-m slip intervals for the 2020 M7.8 Simeonof earthquake (Xiao et al., 2021).  Purple contours show 1-m slip intervals for the 2021 M8.2 Chignik earthquake (Elliott et al., 2022).  Light blue and cyan contours show possible 1-m slip intervals for 1938 M8.3 earthquake (Freymueller et al., 2021).  Blue dots are continuous GNSS sites.  Gray shading shows geodetic coupling estimates.  1.0 means plates are fully locked together; 0 means plates are freely slipping past each other.
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Bertrand Delouis @bertranddelouis.bsky.social · 17/07/2025
Auto slipmap with regional records (SLIPNEAR method, Géoazur/OCA) M 7.3 - ALASKA - 2025-07-16 20:37:39 (UTC) Plane striking N343 (NNW-SSE) shown. Rupture direction to the South-East constrained by nearby stations (quite opposite to the USGS result). Thanks to seismic records through IRIS
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Bertrand Delouis @bertranddelouis.bsky.social · 08/06/2025
Slipmap for the earthquake of Colombia M6.4 of 8 June 2025. SLIPNEAR method. Preferred rupture plane (strike,dip,rake) : 50 20 112 with confidence : 47.% Discrimination among the two nodal planes may be considered reliable only if this confidence is larger or equal to 70%
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aldozollo.bsky.social @aldozollo.bsky.social · 24/05/2025
Our new study just out in #NatureCommunications maps the deep structure of Campi Flegrei with unprecedented detail—and found that pressurized fluids, not magma, are the main cause of current unrest 🇮🇹 Read the full study here: 🔗 doi.org/10.1038/s414...
doi.org
3D structure and dynamics of Campi Flegrei enhance multi-hazard assessment - Nature Communications
This study maps Campi Flegrei caldera’s internal structure, linking a gas-enriched reservoir and a deformed caprock to ground uplift and earthquakes. Land instability, seismic events and the risk of a...
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Bertrand Delouis @bertranddelouis.bsky.social · 02/05/2025
Auto slipmap with regional records (SLIPNEAR method, Géoazur/OCA) M 7.5 – DRAKE PASSAGE 2025-05-02 12:58:27.5 UTC Rupture plane not selected in an automated way. Plane dip to the NE (strike 326) shown. Rupture propagation mainly to the SE. Thanks to seismic records through IRIS
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Earthquake information from Geoscope Observatory @geoscope-ipgp.bsky.social · 25/04/2025
Mw=6.2, NEAR COAST OF ECUADOR (Depth: 21 km), 2025/04/25 11:44:55 UTC - Full details here: geoscope.ipgp.fr/scripts/seismes/fi…
Earthquake source parameters
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Earthquake information from Geoscope Observatory @geoscope-ipgp.bsky.social · 23/04/2025
Mw=6.3, TURKEY (Depth: 4 km), 2025/04/23 09:49:10 UTC - Full details here: geoscope.ipgp.fr/scripts/seismes/fi…
Earthquake source parameters
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Bertrand Delouis @bertranddelouis.bsky.social · 23/04/2025
Auto slipmap with regional records (SLIPNEAR method, Géoazur/OCA) M 6.2 – Western Turkey - 2025-04-23 09:49:10 (UTC) EW nodal plane preferred with confidence 65% as the rupture plane. Rupt propagation mainly to the East. Thanks to seismic records from KOERI
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Bertrand Delouis @bertranddelouis.bsky.social · 14/04/2025
Auto solution FMNEAR (Géoazur/OCA) with regional records for the M 5.2 – Southern California, 2025-04-14 17:08:28 UTC (Loc EMSC used to trigger inversion). Thanks to the seismic records provided through IRIS and SCEDC
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Gareth Funning @gfun.earth · 03/04/2025
The whole #MyanmarEarthquake rupture in one interferogram! This is three consecutive wide swath frames of ALOS-2 data, provided by JAXA through agreement with NASA. The line-of-sight (LOS) is ~perpendicular to fault strike, so most of what you see is vertical motion at bends and steps of the fault.
A radar interferogram covering 17.5 to 23.5 degrees north, in Myanmar. Tightly clustered fringes delimit the likely 2025 earthquake rupture zone.
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Robin Lacassin @rlacassin.bsky.social · 02/04/2025
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.
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.
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Dr. Eric J. Fielding, PhD @ericfielding.mastodon.social.ap.brid.gy · 01/04/2025
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]
Map of Myanmar area showing sharp color change along the fault running roughly north-south. Red on west side where land moved northward.
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Rich Briggs @rangefront.bsky.social · 01/04/2025
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 🙏
Screenshot of Myanmar M7.7 surface rupture map service
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Dr. Paula Marques Figueiredo @paleoquake.bsky.social · 01/04/2025
www.linkedin.com/posts/remote...
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Dr. Judith Hubbard @judithgeology.bsky.social · 29/03/2025
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
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Henning @geohenning.bsky.social · 28/03/2025
Cross-section of slip distribution by the USGS for the M7.7 Myanmar earthquake. Slip occured along the distance of about 250 km, maximum ~horizontal slip of 5.1 meters. ⚒🧪
Cross-section of slip distribution. The strike direction is indicated above each fault plane and the hypocenter location is denoted by a star. Slip amplitude is shown in color and the motion direction of the hanging wall relative to the footwall (rake angle) is indicated with arrows. Contours show the rupture initiation time in seconds.  Surface projection of the slip distribution superimposed on GEBCO bathymetry. Thick white lines indicate major plate boundaries [Bird, 2003]. Gray circles, if present, are aftershock locations, sized by magnitude.
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Lidong Bie @lidongbie.bsky.social · 28/03/2025
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.
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Stephen Hicks @seismo-steve.bsky.social · 28/03/2025
Preliminary back-projection which seems to confirm the finite fault model: www.linkedin.com/posts/hongju...
linkedin.com
For the M7.7 Myanmar earthquake occurred in 28 March 2025, we produced the… | Hongjun Si
For the M7.7 Myanmar earthquake occurred in 28 March 2025, we produced the following analysis results for emergency response: (1)Energy radiation from the…
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Bertrand Delouis @bertranddelouis.bsky.social · 28/03/2025
First slip map for the Mw 7.8 Myanmar earthquake. Propagation of rupture towards the South. Slipnear method (Géoazur/OCA).
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Stephen Hicks @seismo-steve.bsky.social · 28/03/2025
Fault segments and historical earthquakes along the Sagaing fault, which passes beaneath Mandalay, from Wang et al. (2014, JGR). doi.org/10.1002/2013...
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Robin Lacassin @rlacassin.bsky.social · 28/03/2025
The @ipgp.bsky.social #Geoscope solution 👇 shows mechanism of #Myanmar #earthquake (strike-slip, likely dextral rupture on #Sagaing fault) and the source time function with a rupture duration of 2 minutes. Magnitude is determined to be Mw7.9 with this solution. geoscope.ipgp.fr/index.php/en... ⚒️ 🧪
Map showing the location of the earthquake on the sagaing fault. The fault is shown by a blue line. The mechanism of the earthquake is also shown as well as the source time function.
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Henning @geohenning.bsky.social · 28/03/2025
The USGS already released a shakemap for the M7.7 #earthquake in Myanmar a few minutes ago. This will be devastating. ⚒️🧪 earthquake.usgs.gov/earthquakes/...
Shakemap by USGS for the M7.7 earthquake in Myanmar on Mar 28, 2025. Shaking expected up to violet. There will be heavy damage.
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Bertrand Delouis @bertranddelouis.bsky.social · 25/03/2025
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...
sismoazur.oca.eu
Sismoazur
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Bertrand Delouis @bertranddelouis.bsky.social · 24/03/2025
Une vidéo sur le séisme du 18 mars 2025 (M 4.1) près de Nice : analyse et contexte géologique www.youtube.com/watch?v=mROO... Merci à l'ObservaTerre - Epos-France pour la publication.
youtube.com
Séisme du 18 mars 2025 près de Nice : analyse et contexte géologique
YouTube video by L'ObservaTerre
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aldozollo.bsky.social @aldozollo.bsky.social · 18/03/2025
Mar 13 Campi Flegrei quake double (M4.6) on vertical N-S La Pietra Fault (~1km). 5% chance M≥4.5 soon; up to 1g shaking. Early warning worked. tinyurl.com/y3yw8ncr
tinyurl.com
Report_CampiFlegrei_event_130325_v2.pdf
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aldozollo.bsky.social @aldozollo.bsky.social · 21/03/2025
On Mar 18, 2025, a Mw4.0 quake near Potenza showed normal faulting. ~2.2 MPa stress drop, MMI VI (~4.9%g) near epicenter, complex extension. Early-warning worked in seconds. Innovative monitoring (DAS, apps) boosted real-time resilience. sway.cloud.microsoft/CYKl7Cjmzuby...
sway.cloud.microsoft
Potenza Earthquake (18/3/2025)
The 2025 Potenza Earthquake
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Bertrand Delouis @bertranddelouis.bsky.social · 19/03/2025
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.
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Anthony Lomax @alomaxnet.bsky.social · 03/03/2025
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...
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