iiinova — where your digital self keeps evolving

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Seismological Society of America @seismosocam.bsky.social · 28/08/2026

Presenting SDpy — stress drop in Python! This is an open-source Python package for estimating earthquake stress drop based on spectral fitting and spectral ratio methods. Find out more, in #SRL. ⚒️ buff.ly/dPEd5K6

Workflow of SDpy (stress drop in Python).

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Earthquake information from Geoscope Observatory @geoscope-ipgp.bsky.social · 27/08/2026

Mw=6.0, EASTERN GULF OF ADEN (Depth: 6 km), 2026/08/27 21:07:38 UTC - Full details here: geoscope.ipgp.fr/scripts/seismes/fi…

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Dr. Judith Hubbard @judithgeology.bsky.social · 10/08/2026

⚒️ 🧪 A deadly M7.4 earthquake just struck Colombia, causing strong shaking and collapsing buildings. The death count - now at 69 - has been increasing with passing hours. We look at the tectonics responsible for this event. earthquakeinsights.substack.com/p/deadly-m74...

earthquakeinsights.substack.com

Deadly M7.4 earthquake strikes beneath Colombia

Deep strike-slip event within a subducting slab

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Dr. Judith Hubbard @judithgeology.bsky.social · 20/07/2026

⚒️ 🧪 A M5.5 earthquake struck central Peru today, killing at least 6. What made this event so damaging? earthquakeinsights.substack.com/p/deadly-m55...

earthquakeinsights.substack.com

Deadly M5.5 earthquake strikes central Peru

Shallow hypocenter + vulnerable construction = serious damage

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Dr. Eric J. Fielding, PhD @ericjfielding.bsky.social · 10/07/2026

NISAR surface displacement map of Venezuela is the NASA Earth Observatory Image of the Day today. Map shows earthquake displacement on land is largest north of Caracas, so fault slip at depth on offshore fault greater. Fault went through Catia La Mar next to airport. science.nasa.gov/earth/earth-...

Map of north central Venezuela with surface displacements due to large earthquake shown with color. Coast from Morón east past Caracas moved as much as 60 cm west (blue tones) due to slip on fault offshore. Red tones show eastward displacement north of the fault near Morón and in Catia La Mar of the La Guaira coastal state.

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𝙈𝙞𝙣 𝙎𝙚𝙤𝙣𝙜 𝙎𝙚𝙤 @seismoseo.bsky.social · 03/07/2026

Also curious whether this 2009 event also ruptured eastward.

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𝙈𝙞𝙣 𝙎𝙚𝙤𝙣𝙜 𝙎𝙚𝙤 @seismoseo.bsky.social · 03/07/2026

It seems that San Sebastian-El Pilar (SS-EP) fault is the fault system where material contrast well predicts the rupture direction? I have limited background, but found studies that reported eastward rupture propagation for some M > 6 past events. agupubs.onlinelibrary.wiley.com/doi/abs/10.1...

agupubs.onlinelibrary.wiley.com

The 1967 Caracas Earthquake: Fault geometry, direction of rupture propagation and seismotectonic implications

The fault plane orientation of the July 30, 1967, Caracas earthquake (Mw = 6.6) has been a source of controversy for several years. This strike-slip event was originally thought to have occurred on a...

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𝙈𝙞𝙣 𝙎𝙚𝙤𝙣𝙜 𝙎𝙚𝙤 @seismoseo.bsky.social · 30/06/2026

Although this was my first attempt to deal with large event and teleseismic data, WISP was written good enough to practice this inversion. I used single-fault model, but moment rate functions seem to reasonably match with that of USGS. SH waves fit relatively bad, but that is also the case for USGS.

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𝙈𝙞𝙣 𝙎𝙚𝙤𝙣𝙜 𝙎𝙚𝙤 @seismoseo.bsky.social · 30/06/2026

Using open-source WISP (Goldberg et al., 2026) code and with help from Claude Opus 4.8, I did very preliminary finite fault inversion of 2026 Venezuela earthquake. Producing reasonably looking result took several iterations, but with very little effort of data-fetching.

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Dr. Judith Hubbard @judithgeology.bsky.social · 28/06/2026

⚒️ 🧪 Should the Venezuela earthquake(s) be considered one event or two? We asked the USGS how they made their decision. Also: a look at their preliminary slip model. earthquakeinsights.substack.com/p/venezuela-...

earthquakeinsights.substack.com

Venezuela: One earthquake or two?

A look into the data as the USGS saw it

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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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Baoning Wu @baoningwu.bsky.social · 27/06/2026

A replot of the latest aftershock locations from FUNVISIS (Jun-26 night, California). It seems that there is a gap between the east rupture and the west rupture. One needs a Python script to download the catalog, using the link that the browser uses. www.funvisis.gob.ve/monitor.html

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Dr. Judith Hubbard @judithgeology.bsky.social · 26/06/2026

What have we learned about the deadly Venezuela earthquake in the last day and a half? A lot, actually. earthquakeinsights.substack.com/p/early-scie...

earthquakeinsights.substack.com

Early scientific picture of the deadly Venezuela earthquake emerges

Eastward rupture from the Boconó fault onto the San Sebastián fault

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Lucy Jones @drlucyjones.bsky.social · 10/05/2026

The Imperial Valley has seen dozens if not hundreds of these sort of swarms over the century we have recorded. A swarm is a group of quakes (dozens to thousands) where there are many quakes close in size and no obvious mainshock. Often the size will grow like we've seen here going from M3s to M4s.

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Lucy Jones @drlucyjones.bsky.social · 10/05/2026

So 2 areas with swarms ongoing in Southern California. A classic Brawley seismic zone swarm today in the Imperial Valley fault. Largest so far is M4.1. These continue until they stop so we will likely see more M3s tonight and may get bigger.

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Caltech Seismological Laboratory @caltechseismo.bsky.social · 10/05/2026

A swarm sequence has been confirmed near #Brawley, CA, #SouthernCalifornia #Earthquake. This is a typical sequence for the area, with with 81 events catalogued so far, including a M4.4 at 7:22 PDT. You can read more about it here: www.scsn.org/index.php/20...

scsn.org

Latest Earthquake Information | SCSN

For data archive access visit SCEDC

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Dr. Wendy Bohon @drwendyrocks.bsky.social · 10/05/2026

Seismic swarm happening southwest of Brawley. This area is notoriously swarmy, and had significant swarms in 2012 and 2020. 82 detected events so far, including a M4.4. More earthquakes are likely and may be felt be folks nearby.

Map showing the location of earthquakes marked by dots. The size of the dot indicates the relative magnitude and the color indicates the time. Earthquakes in Red happened in the last hour and earthquakes and Orange happened in the last day..

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Dr. Judith Hubbard @judithgeology.bsky.social · 20/04/2026

⚒️ 🧪 A M7.4 earthquake offshore northern Japan today led to a megaquake advisory: a warning that the risk of a M8+ earthquake is ten times higher than usual. What does that mean, and how does this event fit into the mosaic of earthquakes in this seismically active region?

earthquakeinsights.substack.com

Another large subduction earthquake off the coast of northern Japan...

...and another megaquake advisory is issued.

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Steven J. Gibbons @stevenjgibbons.bsky.social · 10/04/2026

As of 2026-04-10 “Relative location of seismic events using broadband frequency-wavenumber analysis: Application to the North Korean Nuclear Test Site” is published in final form in @rasjournals.bsky.social RAS Techniques and Instruments (doi.org/10.1093/rast...) Let's take a look ... (1/n)

Images from the paper “Relative location of seismic events using broadband frequency-wavenumber analysis: Application to the North Korean Nuclear Test Site” by Steven J. Gibbons in RAS Techniques and Instruments (2026) https://doi.org/10.1093/rasti/rzag023

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Dr. Judith Hubbard @judithgeology.bsky.social · 02/03/2026

Will a large earthquake be followed by an even larger event? A 2025 paper proposed a new method for classifying foreshocks in advance, with an apparent success rate above 90%. But does it work? Our deep-dive analysis found serious problems that we believe invalidate the result. Read more: ⚒️ 🧪

earthquakeinsights.substack.com

Can we tell if an earthquake is going to be a foreshock?

A recent study says yes, but we find otherwise.

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Seismological Society of America @seismosocam.bsky.social · 25/01/2026

🌟OPEN ACCESS🌟 In 2024, the magnitude 4.2 Buan, Korea earthquake and its aftershock sequence — all events in a stable continental region — were exceptionally well-recorded. A new #SRL paper reveals details. ⚒️ buff.ly/0okDOm3

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Seismological Society of America @seismosocam.bsky.social · 21/01/2026

🌟OPEN ACCESS🌟Complex Multipatch Rupture and Aftershock Characteristics of the 2024 Mw 4.2 Buan, Korea, Earthquake Sequence #SRL ⚒️ On June 11, 2024, a M4.2 event struck near Buan and was felt across South Korea. What happened? buff.ly/0okDOm3

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Seismological Society of America @seismosocam.bsky.social · 16/01/2026

In a new #BSSA paper, scientists introduce a novel mapped variable for California — the regional geological unit, defined as a combination of geomorphic provinces and geological units. This variable strongly correlates with site amplification. ⚒️ pubs.geoscienceworld.org/ssa/bssa/art...

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Seismological Society of America @seismosocam.bsky.social · 18/12/2025

The Intensity Gap: A Global Analysis of Who Responds to the Crowdsourced “Did You Feel It?” System #SRL⚒️ Who responds to DYFI? Turns out, it depends on factors like language, broadband subscriptions, and even the physical parameters of an earthquake. pubs.geoscienceworld.org/ssa/srl/arti...

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GFZ Earthquake Alerts (GEOFON) @geofon.bsky.social · 16/12/2025

Magnitude : 4.6 Region: *Eastern Russia-Northeastern China Border * Time: 2025-12-16 14:38:42 UTC Epicenter : 130.70°E 42.65°N Depth: 566 km *First posted at: 14:57 UTC* geofon.gfz-potsdam.de/eqexplorer/ev… #GEOFON #GFZ #earthquake #magnitude

Map showing the earthquake of 2025-12-16 in Eastern Russia-Northeastern China Border Region

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Princeton University Press @princetonupress.bsky.social · 14/12/2025

@thwbecker.bsky.social and Claudio Faccenna's Tectonic Geodynamics is a comprehensive, integrative approach to tectonics and geodynamics for students and researchers. Out now (6 Jan UK pub)! Explore a free preview: press.princeton.edu/books/hardco... #EarthScience #Science #Geodynamics

Tectonic Geodynamics by Thorsten Becker and Claudio Faccenna. A comprehensive, integrative approach to tectonics and geodynamics for students and researchers.

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𝙈𝙞𝙣 𝙎𝙚𝙤𝙣𝙜 𝙎𝙚𝙤 @seismoseo.bsky.social · 12/12/2025

Also, I learned that there are some political issues about magnitude (totally unrelated to science), where the official agency never corrects local magnitude (ML 4.8) even though it is ML 4.6 if using all available stations. Also, they never reports moment magnitude perhaps because it is smaller.

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𝙈𝙞𝙣 𝙎𝙚𝙤𝙣𝙜 𝙎𝙚𝙤 @seismoseo.bsky.social · 12/12/2025

There are still some unresolved questions, such as large discrepancy between Mw and ML (Mw 4.23 vs ML 4.59), but not only restricted to this event. I personally believe that this may be combined effect of complex source and high average stress drop, but I could not discuss this issue in the paper.

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𝙈𝙞𝙣 𝙎𝙚𝙤𝙣𝙜 𝙎𝙚𝙤 @seismoseo.bsky.social · 12/12/2025

Just learned that this platform provides much flexible option to post long thread at once, compared to Twitter (not aware of their paid version). I think this is obviously superior aspect.

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𝙈𝙞𝙣 𝙎𝙚𝙤𝙣𝙜 𝙎𝙚𝙤 @seismoseo.bsky.social · 12/12/2025

I hope this study gains attention from the people interested in seismicity of intraplate regions, especially those broadly classified as Stable Continental Regions (SCRs), since we discuss some potential discriminatory features of the rupture processes of SCR earthquakes.

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𝙈𝙞𝙣 𝙎𝙚𝙤𝙣𝙜 𝙎𝙚𝙤 @seismoseo.bsky.social · 12/12/2025

One interesting fact I learned from my advisor was that Prof. Helmberger once told her about working on the project of using SmS phases for directivity and source analysis, but she refused the suggestion because it was not her interest back then.

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𝙈𝙞𝙣 𝙎𝙚𝙤𝙣𝙜 𝙎𝙚𝙤 @seismoseo.bsky.social · 12/12/2025

I came out of the idea of using SmS phase while chatting with coauthor Sangwoo one day but found that it was already proposed by Prof. Helmberger 30 years ago (year I was born). pubs.geoscienceworld.org/ssa/bssa/art...

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𝙈𝙞𝙣 𝙎𝙚𝙤𝙣𝙜 𝙎𝙚𝙤 @seismoseo.bsky.social · 12/12/2025

The idea of using SmS phases (which has obvious downgoing ray take-off angles) has been first suggested by Prof. Don Helmberger and colleagues in 1980s-90s, but has gained less attention potentially due to difficulty in dealing with interference with the other phases.

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𝙈𝙞𝙣 𝙎𝙚𝙤𝙣𝙜 𝙎𝙚𝙤 @seismoseo.bsky.social · 12/12/2025

We show this by conducting both slip inversion with and without SmS relative source time functions, and for dense and sparse station geometry. We find that adding few SmS phases significantly enhances the resolution of slip distribution.

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𝙈𝙞𝙣 𝙎𝙚𝙤𝙣𝙜 𝙎𝙚𝙤 @seismoseo.bsky.social · 12/12/2025

Despite this work being specific study of single event sequence in a region not very interesting in terms of seismicity, one takeaway for those conducting source analysis (especially small events) is that Moho-reflected waves, such as SmS waves can be sometimes very useful.

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𝙈𝙞𝙣 𝙎𝙚𝙤𝙣𝙜 𝙎𝙚𝙤 @seismoseo.bsky.social · 12/12/2025

Our team studied the Mw 4.2 earthquake in South Korea last year and the work has just been published in SRL. I was fortunate to lead the research as the first author, mainly contributing on the source time function analysis using Empirical Green's Function approach.

pubs.geoscienceworld.org

Complex Multipatch Rupture and Aftershock Characteristics of the 2024 Mw 4.2 Buan, Korea, Earthquake Sequence | Seismological Research Letters | GeoScienceWorld

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Stephen Hicks @seismo-steve.bsky.social · 22/11/2025

This figure from a perspective piece on our paper by Virginie Pinel beautifully illustrates our proposed magma-pumping mechanism! www.science.org/doi/10.1126/...

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Anthony Lomax @alomaxnet.bsky.social · 06/12/2025

After a 3.3-magnitude earthquake in north-west England on Wednesday night, "Trains were halted after a suspected AI-generated picture that seemed to show major damage to a bridge appeared on social media". So there we are 😱 www.bbc.com/news/article...

bbc.com

Trains cancelled over fake bridge collapse image

Rail services were cancelled after a 'hoax' picture of a damaged bridge appeared on social media

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Anthony Lomax @alomaxnet.bsky.social · 09/12/2025

NLL-SC relocation of M7 Dec 6 #Alaska #Yukon Hubbard Glacier #earthquakes and seismicity since 2020. UPDATED with events throug Dec 9. Relocation catalog: doi.org/10.5281/zeno...

Epicenter map of NLL-SSST-coherence relocated seismicity for the period 2020 to 9 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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Dr. Alice-Agnes Gabriel @inseismoland.bsky.social · 08/12/2025

Huge Congratulations to Phd Student Jeena Yun for having two companion papers published in JGR Solid Earth agupubs.onlinelibrary.wiley.com/doi/10.1029/... and agupubs.onlinelibrary.wiley.com/doi/10.1029/...! In the first paper she explores the role of heterogeneous friction and stress in controlling

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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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Jascha Polet @jascha.bsky.social · 06/12/2025

M6.9 Yakutat #earthquake is located very close to the border of the USA and Canada. Preliminary results from GFZ Potsdam indicate relatively high non double couple component with oblique mechanism. ⚒️🧪

Historical earthquake map for the region of today’s M6.9 Yakutat earthquake generated by Jascha Polet using GMT.

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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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