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@seismosocam.bsky.socialOct 9, 2026, 3:03 PM

🌟 OPEN ACCESS 🌟 Simulation‐Based Scenario ShakeMaps for Large Magnitude (6.5+) Crustal Earthquakes on the Seattle, Tacoma, and Southern Whidbey Island Faults, Washington, USA #BSSA ⚒️

Simulation‐based ShakeMaps show that basins and rupture details strongly shape shaking.

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Schematic representation of how scale factors are developed for points outside the simulation domain. 
@seismosocam.bsky.socialOct 8, 2026, 9:01 PM

In a new #BSSA paper, scientists dug up the two most recent surface-rupturing paleoearthquakes of China’s North Liuleng Shan Fault. By dating these events, the team established a recurrence interval of 12,233 ± 450 years. ⚒️

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Topographic and geomorphic features of the Gongjiawan road cut (GJW‐RC) site. Top panel shows a hillshade map overlain by a 2-meter interval topographic contour based on Structure‐from‐Motion‐derived digital elevation model showing fault traces (red triangles). Bottom panel shows an interpretive map with the offset landforms near the GJW‐RC.
@seismosocam.bsky.socialOct 8, 2026, 3:00 AM

Separating the upper-crustal seismic anisotropy signal of inherited structure versus ongoing deformation is difficult. Scientists look to the southeastern Korean Peninsula to explore how to do so. #BSSA ⚒️

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Ray path coverage (red lines) for measurements yielding reliable shear-wave splitting parameters.
@seismosocam.bsky.socialOct 7, 2026, 4:03 PM

🌟OPEN ACCESS🌟Efficient Physics‐Informed Ground‐Motion Simulations with Reduced‐Order Models: CyberShake Implications and High‐Resolution Site Terms for Southern San Andreas Fault Earthquakes #BSSA ⚒️

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Maps of the study area in southern California. The left panel shows the Uniform California Earthquake Rupture Forecast, version 3 (UCERF3) fault traces, indicated by gray lines. The portion of the southern San Andreas fault used in this study is shown in red. The CyberShake 22.12 sites in southern California are indicated by the triangles. The right panel is a zoomed‐in view of the CyberShake 22.12 sites. The gold star indicates a location in the narrow Fillmore basin where hazard is challenging to model accurately.
@seismosocam.bsky.socialOct 7, 2026, 3:03 PM

🌟 OPEN ACCESS 🌟 CyberShake Probabilistic Seismic Hazard Model for Northern California #BSSA ⚒️

Study 24.8 implements the CyberShake workflow for 315 sites in the greater San Francisco Bay Area.

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Schematic representation of the software elements in the CyberShake platform.
@seismosocam.bsky.socialOct 6, 2026, 9:01 PM

🌟 OPEN ACCESS 🌟 The 1975 magnitude 7.3 Haicheng earthquake is notable for precursory activity and successful public warning. A careful look at data from before and after the earthquake reveal statistically significant anomalies. #BSSA ⚒️

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Spatial distribution of earthquake epicenters within the study area surrounding the region around the Liaoning province from C.E. January 1, 1290 to February 4, 1975. The events with magnitude equal to and above 4.8 of the pre‐1970 earthquake catalog and those with magnitude above 1.0 of the post‐1970 earthquake catalog are shown by gray and red dots, respectively.
@seismosocam.bsky.socialOct 6, 2026, 4:04 PM

Anatomy of Synthetic Ground‐Motion Variability in Central Italy: Insights from Kinematic Rupture Scenarios #BSSA ⚒️

A new study provides a benchmark for uncertainty decomposition via mixed‐effects modeling.

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Study domain used for ground‐motion modeling under variable source scenarios, with 400 virtual receivers (triangles). The blue and red triangles denote the Norcia and Amatrice domains, respectively, and indicate the velocity model adopted at each receiver.
@seismosocam.bsky.socialOct 5, 2026, 3:03 PM

🌟 OPEN ACCESS 🌟 Testing Characteristic Magnitude Distributions in Modern PSHA Models #BSSA ⚒️

“We do not find evidence of characteristic magnitude distributions in the last 93 yr of seismicity observed in the Western United States.” 😮

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95% confidence model predictions for the magnitude probability distribution for characteristic and anticharacteristic areas, derived from Monte Carlo sampling over the NSHM23 logic tree, compared to the observed catalog.
@seismosocam.bsky.socialOct 4, 2026, 3:02 PM

A Robust Time‐Domain Approach for Measuring Moment Magnitudes Using Peak Displacement Amplitude #BSSA ⚒️

Check out this modified time-domain approach to determine earthquake moment magnitude!

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Spectral ratios of time‐domain three‐component S‐wave spectral amplitudes to time‐domain vertical amplitudes. Thick‐solid lines at each center frequency represent the medians, and the dashed line indicates their overall median.
@seismosocam.bsky.socialOct 4, 2026, 3:00 AM

In a new #BSSA paper, a team of scientists developed a deep-learning model that detects earthquakes in GNSS data. They used the Ridgecrest, California earthquake sequence as a case study. ⚒️

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Example of the rupture pattern for one of the FakeQuakes ruptures used to generate synthetic displacement waveforms for the training dataset. The triangular shapes represent individual subfaults. 
@seismosocam.bsky.socialOct 3, 2026, 9:01 PM

In a new #BSSA paper, scientists present an automatic high‐pass cutoff frequency selection method that helps with the denoising process — important for the use of strong-motion data. ⚒️

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Flowchart of the grey wolf optimizer–decision tree–recursive feature elimination with cross‐validation algorithm used for feature selection.
@seismosocam.bsky.socialOct 2, 2026, 3:03 PM

🌟 OPEN ACCESS 🌟 How to Determine an Earthquake Rate Budget? A Comparison of Geodetic, Geologic, and Seismologic Moment Rates #BSSA ⚒️

Updated datasets help scientists tackle questions related to earthquake rates and seismic hazard analyses.

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Geologic data used in National Seismic Hazard Model (NSHM) across model years. Percentages plotted on the y axis are relative to the western United States portion of the 2023 U.S. NSHM. 
@seismosocam.bsky.socialOct 2, 2026, 4:00 AM

Sparse ground-motion data? No problem! A new #BSSA study demonstrates how combining geospatial data with site-specific information can result in a useful regional site term for the Basin and Range region. ⚒️

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For the dataset in this study, the left panel shows the number of ground‐motion recordings by period and the right panel shows the number of stations by period after removing the unusable frequencies.
@seismosocam.bsky.socialSep 30, 2026, 9:01 PM

In a new #BSSA paper, scientists explored the upper-crustal seismic anisotropy of the southeastern Korean Peninsula using data from the Gyeongju Hi‐density Broadband Seismic Network. They address whether anisotropy reflects inherited fabrics or ongoing deformation. ⚒️

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Ray path coverage (red lines) for measurements yielding reliable shear-wave splitting parameters.
@seismosocam.bsky.socialSep 30, 2026, 3:03 PM

Paleoseismic Records of the North Liuleng Shan Fault: Implications for Intraplate Seismic Hazard in the Northern Shanxi Graben, China #BSSA ⚒️

Trench excavations unearthed the two most recent surface-rupturing earthquakes.

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Topographic and geomorphic features of the Gongjiawan road cut (GJW‐RC) site. Top panel shows a hillshade map overlain by a 2-meter interval topographic contour based on Structure‐from‐Motion‐derived digital elevation model showing fault traces (red triangles). Bottom panel shows an interpretive map with the offset landforms near the GJW‐RC.
@seismosocam.bsky.socialSep 30, 2026, 3:00 AM

Multisite integrated chronologies, or MUSIC, is an open‐source toolbox for correlation assessment and combination of paleoseismic data. Find out more, including an example from the Altyn Tagh Fault, in #BSSA. ⚒️

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@seismosocam.bsky.socialSep 28, 2026, 3:02 PM

🌟 OPEN ACCESS 🌟 Multitimescale Anomalies of the Precursory Scale Increase (Ψ) Prior to the 1975 Ms 7.3 Haicheng Earthquake #BSSA ⚒️

What insights can the 1975 earthquake provide regarding statistically significant anomalies prior to the event?

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@seismosocam.bsky.socialSep 28, 2026, 3:00 AM

Wellington, New Zealand’s central business district experiences site amplification during earthquakes because it is built on a sedimentary basin. Scientists explore site amplification via 3D ground-motion simulations. Find out more, in #BSSA ⚒️

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Map showing the locations of the six earthquake sources and ground‐motion recording stations considered in this study. 
@seismosocam.bsky.socialSep 28, 2026, 12:00 AM

Erratum to Detailed Seismic Structure Beneath the Opak Fault Zone, Yogyakarta, Indonesia: Evidence for an Interconnected Fault System and Implications for Seismic Hazard #BSSA ⚒️

Erratum: buff.ly/pfP4s3S

Original paper: buff.ly/jMoqnKZ

@seismosocam.bsky.socialSep 26, 2026, 9:01 PM

Can GNSS-based early warning algorithms accurately estimate earthquake magnitudes? A new #BSSA paper presents a deep-learning model that detects earthquakes in GNSS data, allowing the waveforms to be identified. ⚒️

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Example of the rupture pattern for one of the FakeQuakes ruptures used to generate synthetic displacement waveforms for the training dataset. The triangular shapes represent individual subfaults. 
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