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Seismological Society of America

@seismosocam.bsky.social

The Seismological Society of America (SSA), founded in 1906, is an international scientific society devoted to the advancement of earthquake science.

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Seismological Society of America @seismosocam.bsky.social · 38m ago

Seismic Source Analysis of the 10 August 2025 Mw 6.1 Sındırgı and the 27 October 2025 Mw 6.1 Sındırgı Earthquakes (Western Anatolia Extensional Province, Türkiye) Based on Geological, Seismological, and InSAR Data #SRL ⚒️ buff.ly/l25k2CD

Active fault map of the Simav fault zone showing destructive earthquakes from historical and instrumental periods.

Seismological Society of America @seismosocam.bsky.social · 2h ago

🌟 OPEN ACCESS 🌟 Mixed Subshear and Supershear Rupture Kinematics of the 2023 Kahramanmaraş, Türkiye Earthquake Doublet Modulated by Complex Fault Geometry #BSSA ⚒️ How does a rupture propagate in a geometrically complex multifault system? buff.ly/dS3uPvD

Backprojection imaging results for the 2023 Kahramanmaraş earthquake doublet.

Seismological Society of America @seismosocam.bsky.social · 4h ago

📣 Get Advice from Expert Mentors📣 15 September at 10-11 AM US PT SSA members, here's your chance to connect with our community for academic and career guidance during this virtual mentoring session. Register for free today!: buff.ly/WRI5Uin

Seismological Society of America @seismosocam.bsky.social · 14h ago

🌟 OPEN ACCESS 🌟 In a new #SRL paper, scientists present a globally applicable method for estimating landslide volume from seismic features. The method could be integrated into future landslide seismic monitoring frameworks. ⚒️ buff.ly/18KB6Ay

Features used in the single and multivariable linear regressions. Both the high‐frequency (1–5 Hz) and long‐period (20–100 second) signals are shown. This waveform shows a detection of the Ellsworth Glacier rock avalanche at AK.SLK.BHZ, located 78.3 kilometers away from the event.

Seismological Society of America @seismosocam.bsky.social · 15h ago

A landslide, induced by extreme rainfall, had no seismic precursors. Yet, its signal associated with the initiation of the slide, and subsequent slowdown, suggests that an early warning system could be helpful. Find out more, in #SRL. ⚒️ buff.ly/tKUyXfm

Seismological Society of America @seismosocam.bsky.social · 20h ago

🌟 OPEN ACCESS 🌟 In a new #SRL paper, scientists present a probabilistic approach to modeling catalog incompleteness as a means to address the problem of real earthquake catalogs deviating from the Gutenberg-Richter law at lower magnitudes. ⚒️ buff.ly/GlBKqiA

The complementary cumulative frequency–magnitude distribution of induced seismicity in north‐central Oklahoma from January 1, 2010 to December 31, 2016.

Seismological Society of America @seismosocam.bsky.social · 22h ago

A list of past recipients of the Harry Fielding Reid Medal reads like a Who's Who in #seismology. Do you know someone who deserves to be the next Reid Medalist? Nominations are due 30 September buff.ly/2d2DHWe #earthquake #geophysics ⚒️

Seismological Society of America @seismosocam.bsky.social · yesterday

Stress Evolution Analysis of Induced Seismicity Sequences in Oklahoma and Kansas #SRL ⚒️ What factors drive the evolution of induced seismicity sequences?  buff.ly/KGMED3U

Combined histogram of prestress values for earthquakes in all analyzed sequences. Shaded regions indicate the “stressed” (to the right with red shading) and “destressed” (to the left with blue shading) preceding stress change regions of the histogram. (a) Results for 3 MPa assumed characteristic stress drop. (b) 10 MPa assumed characteristic stress drop.

Seismological Society of America @seismosocam.bsky.social · 2d ago

The principle of reciprocity is one of the most fundamental physical laws in wave propagation. It means that if the source and receiver locations were swapped, the seismic wavefield would remain the same. How can it be maintained in data-driven methods? #SRL ⚒️ buff.ly/cGRAlEr

Schematic diagrams of the reciprocity relation for single vertical forces at the sources and vertical particle velocity responses at the receivers. The diagram on the left illustrates the original experiment, where the source is placed at point A (red star) and the receiver at point B (blue triangle). The diagram on the right shows the reciprocal experiment, where the source is relocated to point B (blue star) and the receiver to point A (red triangle). Both experiments yield identical waveforms at the receivers.

Seismological Society of America @seismosocam.bsky.social · 2d ago

In a new #SRL paper, scientists improve the MAchine Learning aided earthquake MIgration location (MALMI) algorithm, and apply their new workflow to the Luxian region of China’s Sichuan basin. For details, please visit the paper. ⚒️ buff.ly/aRRozTC

Upper left inset shows the study area location, as a red square, in South China. The main figure is a map showing the geological setting of the study area, the distribution of the planar array, methane sources, and mapped faults. Black triangles denote seismic stations, and red triangles denote manually triggered methane explosion sources. The blue star indicates the epicenter of the September 2021 Ms 6.0 earthquake. Black labels mark the Huangniya fault, Yanziya fault, Yueqinba fault, Shuanghechang fault, Duijinwan fault, and Yujiasi Syncline.

Seismological Society of America @seismosocam.bsky.social · 2d ago

SSA is at #AOGS2026! Stop by our booth in the Exhibit Hall to sign up for a FREE student or early career membership. You'll get access to our journals, travel grants, online mentoring and much more. Come join our global community for #seismology and #earthquake science! ⚒️

Seismological Society of America @seismosocam.bsky.social · 2d ago

🌟 OPEN ACCESS 🌟Phase Picking Beyond Local Distances: Where Waveform Filtering Still Matters for Deep Learning Models #TSR ⚒️ Deep learning workflows for phase picking at regional distances don’t work as well as for they do for local events. How can this be remedied? buff.ly/Hu7lllg

Schematic comparison of the two baseline models and the stacking and branching approaches proposed in this study. A 30 second, three‐component waveform (high‐pass filtered at 1 Hertz for visibility) is shown at the top, with a 3 second input window (highlighted in light blue) containing an analyst‐labeled arrival time (magenta line).

Seismological Society of America @seismosocam.bsky.social · 2d ago

🌟 OPEN ACCESS 🌟 Earthquake Early Warning in Central America from 2016 to 2024 #SRL ⚒️ How well are Guatemala, El Salvador, Nicaragua, and Costa Rica’s earthquake early warning systems doing?  buff.ly/NsfTo4o

Map of seismic networks in Central America showing all instrumentation streaming at the four agencies at the end of the period of study (July 2025).

Seismological Society of America @seismosocam.bsky.social · 2d ago

⚒️ SSA Honors nominations are OPEN: 🏅 Reid Medal: buff.ly/2d2DHWe 🏆️ Richter Award: buff.ly/RwtLphP 📣 Press Award: buff.ly/UesJE3W 🎓️ Excellence in Mentoring (new!): buff.ly/YhwEwhm 🌟 Distinguished Service : buff.ly/SPBkfSK

Seismological Society of America @seismosocam.bsky.social · 3d ago

🌟 OPEN ACCESS 🌟 Distributed acoustic sensing is a promising tool for environmental and cryoseismological studies. How well does it perform in the high Arctic? A new #SRL study explores. ⚒️ buff.ly/AcVqPcn

This two-panel figure shows frequency–wavenumber (f‐k) analysis results of ambient seismic noise at HSPA array in the bandwidth of (a) 2–5 Hz, and (b) 3–5 Hz.

Seismological Society of America @seismosocam.bsky.social · 3d ago

🌟 OPEN ACCESS 🌟 Reverse‐Polarity Earthquakes at Intermediate Depth in North Chile and Bolivia: Observations of a Rare Phenomenon #TSR ⚒️ Scientists discover 4 groups of curious earthquakes in the North Chilean subduction zone. buff.ly/EytMmb5

The two major left and right panels show relocated events of family cID120 on the left and location errors plotted on the right. The five reverse‐polarity events are indicated by a central filled dot. The color corresponds to subclusters. The lower third panel shows the slip history of family cID120. Reverse‐polarity events are indicated by negative slip values highlighted by red outlines. The vertical lines are colored by association to the subclusters in panel (a). Note that in three out of five cases (events 3, 14, and 23) the reverse event is preceded by a regular event with only a very short waiting time between both.

Seismological Society of America @seismosocam.bsky.social · 3d ago

In a new #SRL paper, scientists explored the 2024 Feidong earthquake swarm that occurred on a relatively quiet section of the Tanlu Fault. Their magnetotelluric analysis suggests a low risk of strong earthquakes in the region. ⚒️ buff.ly/7QrRPs3

Horizontal and vertical grids within the 3D model. The red dots represent the locations of magnetotelluric sites.

Seismological Society of America @seismosocam.bsky.social · 4d ago

🌟 OPEN ACCESS 🌟 In a new #BSSA paper, scientists investigate the reliability and technical feasibility of a methodology that includes earthquake sequences (not just the main shock) in probabilistic seismic hazard assessment. ⚒️ buff.ly/7HJ5fOI

Percentage variation of the 50 yr rates between SimplETAS and MPS19_cluster with respect to MPS19_cluster

Seismological Society of America @seismosocam.bsky.social · 4d ago

📣 PRESS RELEASE 📣 In a new #BSSA paper, scientists explore the ground motions produced by supershear earthquakes compared with their subshear counterparts and consider the question: Do the differences matter for engineering purposes? ⚒️ Press release: buff.ly/9oElK9m Paper: buff.ly/eKqPiWS

Simulations Show Distinct Ground Motion Signatures of Supershear Earthquakes | Seismological Society of America

21 July 2026—Sustained supershear earthquake ruptures produce distinct ground motion characteristics compared to subshear earthquakes, according to a study published in the Bulletin of the…

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Seismological Society of America @seismosocam.bsky.social · 4d ago

In a new #SRL paper, scientists explore newly found seismograms that show earthquakes that occurred during an intense and unusual seismic swarm in 1912 in Guadalajara, Mexico. ⚒️ buff.ly/5b7T2oY

Examples of earthquakes recorded on August 2, 1912 at the seismic station in Guadalajara. The white circles around the signals were made by the original operators.

Seismological Society of America @seismosocam.bsky.social · 4d ago

Microseism Generation by Two Consecutive Super Typhoons Crossing the Ryukyu Arc Observed with Ocean‐Bottom Seismometers #SRL ⚒️ What happens to microseisms when two super typhoons occur one after the other? buff.ly/XLRoPB0

Time–frequency power spectrograms at OBS station OT34 from September 22 to October 9, 2018 on (a) the differential pressure gauge and (b) the vertical seismic component, showing marked amplification and frequency broadening of microseism energy in the 2–10 second band as the storms approached the OBS array.

Seismological Society of America @seismosocam.bsky.social · 4d ago

Fifteen Years of Observations Suggest Structural and Ocean‐Wave Control on Seismicity at the Mendocino Triple Junction #SRL ⚒️ How might storms modulate seismicity at the Mendocino Triple Junction?   buff.ly/a3Mmf12

Map of the Mendocino Triple Junction region showing seismicity and beamforming geometry. Circles indicate catalog earthquakes (2010–2024), scaled by moment magnitude and colored by hypocentral depth. Focal mechanisms mark the six largest events. Gray lines with white outlines indicate bearings from the PBO mini‐array to the corresponding epicenters. The yellow diamond marks NOAA buoy 46213 used for wave‐height time series, and inverted triangles denote seismic stations. Bathymetry and topography are from Generic Mapping Tools (GMT) Global Earth Relief.

Seismological Society of America @seismosocam.bsky.social · 5d ago

🌟 OPEN ACCESS 🌟 Did the 2025 magnitude 8.8 Kamchatka earthquake’s source area overlap with that of the 1952 magnitude 9.0 event in the region? Find out, in #TSR. ⚒️ buff.ly/dlRdTSV

Tectonic setting around the Kamchatka Peninsula. Contours show the slab surface depth from the Slab2 model at 20 kilometer intervals. The bold line denotes the Kuril–Kamchatka trench. The black, blue, and red stars represent the epicenters of the mainshock, the largest foreshock, and two magnitude 7+ aftershocks, respectively. The focal mechanisms show the USGS centroid moment tensor solutions used in the study. The blue and red dots indicate epicenters of foreshocks occurring within 10 kilometers of the plate boundary during the 7 days prior to the mainshock, and aftershocks occurring within one month after the mainshock, respectively. The green areas outline the assumed source regions of past prior major earthquakes.

Seismological Society of America @seismosocam.bsky.social · 5d ago

What happened, seismically speaking, after North Korea’s 2017 nuclear test at the Punggye‐ri test site? Find out, in #SRL ⚒️ buff.ly/R8DL3oe

Locations of the North Korea’s nuclear test site (NKTS; red star) and nine seismic stations (black triangles, labeled by station names) within 240 kilometers of the test site. The study area is indicated by a blue rectangle on a regional map of eastern Asia in the inset.

Seismological Society of America @seismosocam.bsky.social · 5d ago

In a new #BSSA paper, scientists develop a model to predict amplification of ground motion in certain scenarios while accounting for topography, with a focus on Pohang, South Korea. ⚒️ buff.ly/3sFoald

Sketch of topographic effects illustrating amplification and de‐amplification patterns associated with topographic parameters.

Seismological Society of America @seismosocam.bsky.social · 5d ago

🌟 OPEN ACCESS 🌟 Low‐Felt Intensity of Earthquakes in the Footwall of the Vanuatu Subduction Zone, New Caledonia, Southwest Pacific #BSSA ⚒️ Data from the footwall of subduction zones is rare. New Caledonia offers just such a setting to test ground-motion prediction equations. buff.ly/3Q6ldtO

Distribution of hypocenter distance against moment magnitude recorded in New Caledonia between 2000–2023.

Seismological Society of America @seismosocam.bsky.social · 6d ago

Sewer pipes can produce seismic signals, according to new research in #SRL! ⚒️ buff.ly/q7ISVgS

This two panel figure shows an example of an event recorded during the continuous monitoring phase. Panel (a) shows approximately five subevents in the waveform records from the array. The red stars denote the potential source locations of the first three subevents. Panel (b) provides the corresponding spectrogram illustrating the frequency content of the event.

Seismological Society of America @seismosocam.bsky.social · 6d ago

Friday 31 July is the DEADLINE for early-bird registration for SSA's #Optical #Seismology meeting this October in #Kona. Register now for the best rates: buff.ly/LFR44lK ⚒️

Seismological Society of America @seismosocam.bsky.social · 6d ago

🌟 OPEN ACCESS 🌟 Planes, trains and automobiles? A deployment along the Parks Highway in Alaska detected that and more! Check out #SRL for details. ⚒️ buff.ly/8bp4AJY

Difference in train signals for northbound (blue) and southbound (orange) trains recorded at one example seismometer (1119), which is 374 meters from the railroad tracks.

Seismological Society of America @seismosocam.bsky.social · 6d ago

Intrinsic Uncertainty of Noise Cross‐Correlation Functions and Its Implications for Source Properties #SRL ⚒️ buff.ly/lk92iSf

Slowness‐averaged intrinsic uncertainty spectra.