Bertrand Delouis
@bertranddelouis.bsky.social
Seismologist. Geoazur lab.
Observatoire de la Côte d'Azur (OCA)
Université Côte D'Azur (UniCA)
France
Observatoire de la Côte d'Azur (OCA)
Université Côte D'Azur (UniCA)
France
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
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
December 8, 2025 at 5:53 PM
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
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
Rupture propagation to the north-west seems to be confirmed by the early aftershock distribution :
December 7, 2025 at 10:08 AM
Rupture propagation to the north-west seems to be confirmed by the early aftershock distribution :
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
Plane oriented NW-SE (dipping to the NE) shown.
Rupt propagation mainly to the NW, surface rupture likely.
Thanks to seismic records through IRIS
December 6, 2025 at 10:19 PM
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
Plane oriented NW-SE (dipping to the NE) shown.
Rupt propagation mainly to the NW, surface rupture likely.
Thanks to seismic records through IRIS
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
Thanks to the seismic records provided through IRIS
December 6, 2025 at 9:56 PM
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
Thanks to the seismic records provided through IRIS
Annot greystones, south of France
December 1, 2025 at 5:07 PM
Annot greystones, south of France
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
Rupture plane not selected in an automated way. The two planes are shown.
The focal mechanism used is from GFZ
October 28, 2025 at 7:32 AM
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
Rupture plane not selected in an automated way. The two planes are shown.
The focal mechanism used is from GFZ
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.
Rupture plane not selected in an automated way. The two planes are shown.
October 27, 2025 at 2:14 PM
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.
Rupture plane not selected in an automated way. The two planes are shown.
The vast majority of the aftershocks is located to the East or South-East of the epicenter, not to the North-West of it:
July 21, 2025 at 10:56 AM
The vast majority of the aftershocks is located to the East or South-East of the epicenter, not to the North-West of it:
July 17, 2025 at 10:23 AM
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
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
July 17, 2025 at 9:36 AM
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
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
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%
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%
June 8, 2025 at 2:53 PM
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%
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%
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
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
May 2, 2025 at 5:57 PM
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
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
The slip distribution coincides well with the aftershock distribution (EMSC), confirming ~15-20 km of rupture propagation towards the East :
April 24, 2025 at 7:04 AM
The slip distribution coincides well with the aftershock distribution (EMSC), confirming ~15-20 km of rupture propagation towards the East :
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
EW nodal plane preferred with confidence 65% as the rupture plane. Rupt propagation mainly to the East.
Thanks to seismic records from KOERI
April 23, 2025 at 11:59 AM
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
EW nodal plane preferred with confidence 65% as the rupture plane. Rupt propagation mainly to the East.
Thanks to seismic records from KOERI
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
Thanks to the seismic records provided through IRIS and SCEDC
April 14, 2025 at 5:43 PM
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
Thanks to the seismic records provided through IRIS and SCEDC
Propagation towards the South confirmed by distribution of seismic moment along strike from FMNEAR inversion.
March 28, 2025 at 8:21 AM
Propagation towards the South confirmed by distribution of seismic moment along strike from FMNEAR inversion.
First slip map for the Mw 7.8 Myanmar earthquake. Propagation of rupture towards the South. Slipnear method (Géoazur/OCA).
March 28, 2025 at 8:17 AM
First slip map for the Mw 7.8 Myanmar earthquake. Propagation of rupture towards the South. Slipnear method (Géoazur/OCA).
Le mécanisme au foyer :
March 25, 2025 at 10:21 AM
Le mécanisme au foyer :
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.
March 19, 2025 at 12:58 AM
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.
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
sismoazur.oca.eu#/focal_mecha...
emsc-csem.org/Earthquake_d...
Thanks to the seismic records from Spain and Portugal provided through IGN and IRIS
February 28, 2025 at 2:18 PM
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
sismoazur.oca.eu#/focal_mecha...
emsc-csem.org/Earthquake_d...
Thanks to the seismic records from Spain and Portugal provided through IGN and IRIS
Revised solution FMNEAR (Géoazur/OCA) with regional records for the M 4.8 - PORTUGAL, 2025-02-17 13:24:03.9 UTC (Loc EMSC used to trigger inversion).
Mw 4.4
Joint inversion of waveforms and first motions.
Thanks to the seismic records provided from Portugal through IRIS
Mw 4.4
Joint inversion of waveforms and first motions.
Thanks to the seismic records provided from Portugal through IRIS
February 17, 2025 at 7:17 PM
Revised solution FMNEAR (Géoazur/OCA) with regional records for the M 4.8 - PORTUGAL, 2025-02-17 13:24:03.9 UTC (Loc EMSC used to trigger inversion).
Mw 4.4
Joint inversion of waveforms and first motions.
Thanks to the seismic records provided from Portugal through IRIS
Mw 4.4
Joint inversion of waveforms and first motions.
Thanks to the seismic records provided from Portugal through IRIS