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SPECFEM @specfem.org · 28/06/2026

PGV shakemap for the Venezuela Mw7.5 event based on the USGS finite-fault solution (red regions have intensity >VII) #specfem3d #shakemap #USGS

PGV shakemap based on USGS finite-fault solution. Red regions have intensity > VII.

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SPECFEM @specfem.org · 28/06/2026

#shakemovie simulation - Venezuela Mw7.5 event using the USGS finite-fault solution #specfem3d

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SPECFEM @specfem.org · 26/06/2026

#shakemovie simulation - Venezuela event using M7.2 & M7.5 double CMT solutions from USGS. this uses the updated M7.2 CMT (half-duration 17.5s) and the M7.5 CMT (half-duration 0.5s - weird for an event of such magnitude). body waves might have triggered the Kuji M6.9 event #specfem3D_globe

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SPECFEM @specfem.org · 24/11/2025

SPECFEM3D Cartesian on the Moon - on April 19, 1972, the Apollo 16 S-IVB rocket booster was sent on collision with the Moon for a seismic experiment to study Moon's interior. Simulation includes subsurface scatterers and Apollo 12 seismic station #specfem3d

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SPECFEM @specfem.org · 22/09/2025

when a SPECFEM developer has a summer holiday project.. check out seismic wiggles :) apps.apple.com/us/app/wiggl... #Wiggles #FDSNstationmonitor #iOS

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SPECFEM @specfem.org · 25/06/2025

air strike reported on June 22, 2025, 2:30am local time (23:00 UTC on 2025-06-21) - not much visible in available data at closest stations AB.HASN, AB.YNKD and IU.GNI (~500-800 km away from Fordow site). main signal visible between 21:45-22:15 UTC is a Mw6.0 earthquake (epicenter in Japan)

vertical displacement of station AB.HASN

vertical displacement of station AB.YNKD

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SPECFEM @specfem.org · 05/06/2025

#specfem3d peak-ground motion (PGV) shakemap of the time-reversal simulation of the Birch glacier collapse. it should highlight the event site - but sometimes things are not so simple.

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SPECFEM @specfem.org · 05/06/2025

#specfem3d time-reversal simulation of the Birch glacier collapse. Reinjecting seismic data from all available Swiss broadband stations together with the velocity model from Diehl et al. (2021) pinpoints the source of all that seismic energy...

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SPECFEM @specfem.org · 31/03/2025

Spectral accelerations (SA) at the Bangkok building collapse site based on the synthetics of the updated USGS finite-fault solution of the Myanmar Mw7.7 earthquake #specfem3d #USGS

Spectral acceleration (SA) plot for the location where the high-rise building collapsed in Bangkok due the Myanmar Mw7.7 earthquake.

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SPECFEM @specfem.org · 30/03/2025

#shakemovie simulation with the updated USGS finite-fault solution of the Myanmar Mw7.7 #earthquake w/ USGS Vs30 and EarthScope EMC FWEA23 (Liu et al. 2024) model #specfem3d #USGS #EarthScope #blender

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SPECFEM @specfem.org · 30/03/2025

PGV shakemap for the Myanmar Mw7.7 #earthquake based on the updated version of the USGS finite-fault solution #specfem3d #shakemap #USGS

PGV shakemap for the Myanmar Mw7.7 earthquake using the updated version of the USGS finite-fault solution

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SPECFEM @specfem.org · 28/03/2025

PGV shakemap for the Myanmar Mw7.7 #earthquake based on USGS finite-fault solution #specfem3d #shakemap

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SPECFEM @specfem.org · 28/03/2025

2025-03-28 Myanmar Mw7.7 #earthquake - shakemovie simulation w/ USGS finite-fault solution and IRIS EMC GLAD-M35 (Cui et al. 2024) model #specfem3d #shakemovie #geoscience #USGS #EarthScope #blender #b3d

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SPECFEM @specfem.org · 26/03/2025

Last Friday, two strong Mw6.2 earthquakes struck near Panama and Alaska - just ~3 minutes apart - followed by a smaller Mw5.7 quake. As if Panama and Alaska decided to sync up.. here’s a #shakeMovie visualization - watch as they light up the Earth with some nice fringes #specfem3dGLOBE

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SPECFEM @specfem.org · 05/03/2025

#SPECFEM codes hit 30,000+ citations! awkward moment. when your simulation software has a bigger social circle than you do and your code is more popular than you’ll ever be. 🙂 well done Dimitri. specfem.org

screenshot of google scholar page of SPECFEM hitting 30k+ citations

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SPECFEM @specfem.org · 08/01/2025

for comparison, this simulation is using the same mesh resolution, but with flat topography and just a single centroid-moment tensor (CMT) source. the noisy scattering pattern is mostly due to the USGS finite-fault solution that uses 147 single point sources with interfering wavefields.

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SPECFEM @specfem.org · 07/01/2025

PGV shakemap for the Shigatse Mw 7.1 #earthquake based on USGS finite-fault solution #specfem3d #shakemap

Peak-Ground Velocity (PGV) shakemap for the Shigatse Mw 7.1 earthquake.

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SPECFEM @specfem.org · 07/01/2025

2025-01-07 Shigatse Mw 7.1 #earthquake - shakemovie simulation w/ USGS finite-fault solution and IRIS EMC GLAD-M35 (Cui et al. 2024) model #specfem3d #shakemovie #geoscience #USGS #IRIS #EarthScope #blender #b3d

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SPECFEM @specfem.org · 20/12/2024

Peak-Ground Velocity (PGV) maps do care about small-scale effects - here's using the local simulation with and without the USGS VS30 near-surface velocity model (background regional model from IRIS EMC LSP_Eucrust1.0, Lu et al. 2018)

PGV shakemap using USGS VS30 near-surface model in local simulation for the city of Freiburg, Germany, of the Waldkirch 2004 Mw4.7 event

PGV shakemap without VS30 near-surface model of the Waldkirch 2004 Mw4.7 event

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SPECFEM @specfem.org · 20/12/2024

#specfem3d example of computing the shaking of the 2004 Dec. 5 Waldkirch event (~Mw4.7) in the nearby city of Freiburg, Germany, by injecting the regional wavefield into a very small-scale local simulation (grid point spacing ~15m) - wavefield injection from regional into local SPECFEM3D

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SPECFEM @specfem.org · 17/12/2024

PGV shakemap for the Vanuatu Mw 7.3 #earthquake based on USGS finite-fault solution #specfem3d #shakemap

Peak Ground Velocity (PGV) shakemap for the Vanuatu Mw 7.3 earthquake

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SPECFEM @specfem.org · 17/12/2024

2024-12-17 Vanuatu Mw 7.3 #earthquake - shakemovie simulation w/ USGS finite-fault solution and IRIS EMC GLAD-M35 (Cui et al. 2024) model #specfem3d #science #USGS #IRIS #blender #b3d

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SPECFEM @specfem.org · 07/12/2024

PGV shakemap for the 2024-04-02P Hualien City, Taiwan Mw 7.4 earthquake based on USGS finite-fault solution #specfem3d #earthquake #shakemap

PGV shakemap for the 2024-04-02 Taiwan Mw 7.4 earthquake

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SPECFEM @specfem.org · 07/12/2024

remember - deadliest earthquakes in 2024 2024-04-02 Hualien City, Taiwan Mw 7.4 earthquake #specfem3d #science #earthquake

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SPECFEM @specfem.org · 07/12/2024

PGV shakemap for the 2024-01-01 Noto Mw 7.5 earthquake based on USGS finite-fault solution #specfem3d #earthquake #shakemap

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SPECFEM @specfem.org · 07/12/2024

remember - deadliest earthquakes in 2024 2024-01-01 Noto Mw 7.5 earthquake #specfem3d #science #earthquake

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SPECFEM @specfem.org · 07/12/2024

PGV shakemap for the Mendocino Mw 7.0 based on USGS finite-fault solution #specfem3d #earthquake #shakemap

PGV shakemap for Mendocino Mw 7.0 earthquake

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SPECFEM @specfem.org · 07/12/2024

2024-12-05 Mendocino Mw 7.0 earthquake - shakemovie simulation w/ USGS finite-fault solution and IRIS EMC WUS256 (Rodgers et al. 2022) model #specfem3d #science #earthquake #USGS #IRIS #blender #b3d

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