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Volume 115, Number 3
June 2025
Bulletin of the Seismological Society of America Cover Image for Volume 115, Issue 3
ISSN: 0037-1106
EISSN: 1943-3573

Special Section: Improving Measurements of Earthquake Source Parameters

Introduction to the Special Section on Improving Measurements of Earthquake Source Parameters
Annemarie Baltay; Rachel E. Abercrombie; Adrien Oth; Takahiko Uchide
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Overview of the SCEC/USGS Community Stress Drop Validation Study Using the 2019 Ridgecrest Earthquake Sequence
Rachel E. Abercrombie; Annemarie Baltay; Shanna Chu; Taka’aki Taira; Dino Bindi; Oliver S. Boyd; Xiaowei Chen; Elizabeth S. Cochran; Emma Devin; Douglas Dreger; William Ellsworth; Wenyuan Fan; Rebecca M. Harrington; Yihe Huang; Kilian B. Kemna; Meichen Liu; Adrien Oth; Grace A. Parker; Colin Pennington; Matteo Picozzi; Christine J. Ruhl; Peter Shearer; Daniele Spallarossa; Daniel Trugman; Ian Vandevert; Qimin Wu; Clara Yoon; Ellen Yu; Gregory C. Beroza; Tom Eulenfeld; Trey Knudson; Kevin Mayeda; Paola Morasca; James S. Neely; Jorge Roman‐Nieves; Claudio Satriano; Mariano Supino; William R. Walter; Ralph Archuleta; Gail Marie Atkinson; Giovanna Calderoni; Chen Ji; Hongfeng Yang; Jiewen Zhang
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SCEC/USGS Community Stress‐Drop Validation Study: How Spectral Fitting Approaches Influence Measured Source Parameters
Elizabeth S. Cochran; Annemarie Baltay; Shanna Chu; Rachel E. Abercrombie; Dino Bindi; Xiaowei Chen; Grace A. Parker; Colin Pennington; Peter M. Shearer; Daniel T. Trugman
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Earthquake Source Spectra Estimates Vary Widely for Two Ridgecrest Aftershocks Because of Differences in Attenuation Corrections
Peter M. Shearer; Ian Vandevert; Wenyuan Fan; Rachel E. Abercrombie; Dino Bindi; Giovanna Calderoni; Xiaowei Chen; William Ellsworth; Rebecca Harrington; Yihe Huang; Trey Knudson; Meggy Roßbach; Claudio Satriano; Mariano Supino; Daniel T. Trugman; Hongfeng Yang; Jiewen Zhang
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Ridgecrest Aftershock Stress Drops from P‐ and S‐Wave Spectral Decomposition
Ian C. Vandevert; Peter M. Shearer; Wenyuan Fan
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Improved Source Parameter Estimation of Earthquakes in the 2019 Ridgecrest Sequence Based on a Global‐Optimization Algorithm and Their Implications on Fault Behaviors
Jiewen Zhang; Hongfeng Yang
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Factors That Influence Variability in Stress‐Drop Measurements Using Spectral Decomposition and Spectral‐Ratio Methods for the 2019 Ridgecrest Earthquake Sequence
Xiaowei Chen; Qimin Wu; Colin Pennington
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Source Parameter Analysis Using Maximum Amplitudes in the Time Domain
Trey C. Knudson; William L. Ellsworth; Gregory C. Beroza
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Capturing Broadband Spectral Characteristics of Moderate‐Size Earthquakes Using Nearby Recordings: A Case Study of 42 Mw 4.0–5.4 Ridgecrest Earthquakes
Chen Ji; Ralph J. Archuleta; Aaron Peyton
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Combining Two Distinct Methods to Resolve Spatial Variation in Attenuation and Earthquake Source Parameters
Giovanna Calderoni; Rachel E. Abercrombie
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Source‐Scaling Comparison and Validation for Ridgecrest, California: Radiated Energy, Apparent Stress, and Mw Using the Coda Calibration Tool (⁠2.6<Mw<7.1⁠)
Kevin Mayeda; Dino Bindi; Jorge Roman‐Nieves; Paola Morasca; Douglas Dreger; Chen Ji; Taka’aki Taira; Ralph Archuleta; William R. Walter; Justin Barno
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Impact of Geometric Spreading in the Fourier Domain on Source Spectra: Observations of Steep Amplitude Decay and Frequency Dependence from the 2019 Ridgecrest, California, Earthquake, Seq...
Gail M. Atkinson
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Source Parameter Estimation Using Site‐Corrected Source Spectra for the 2019 Ridgecrest Earthquake Sequence in Southern California
Byeong Seok Ahn; Tae‐Seob Kang; Hyun Jae Yoo
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Importance of Considering Near‐Surface Attenuation in Earthquake Source Parameter Estimation: Insights from Kappa at a Dense Array in Oklahoma
Hilary Chang; Rachel E. Abercrombie; Nori Nakata
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Earthquake Source Spectra and Site Attenuation in Northwestern France
Marion Alloncle; Mickaël Bonnin; Antoine Mocquet
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Scaling and Depth Variability of Source Parameters in Central and Southern Italy Using Regional Attenuation Models
Dino Bindi; Daniele Spallarossa; Matteo Picozzi; Gabriele Tarchini
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Source Characteristics of Tectonic and Induced Events near St. Gallen, Switzerland: Utilizing the Empirical Green’s Function Method and Generalized Inversion Technique
SeongJu Jeong; Semechah K. Y. Lui
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Stress Drop Variations of (A)Seismic Fault Segments in the Sea of Marmara Region (Northwestern Türkiye) Supported by Different Methodological Approaches
Xiang Chen; Grzegorz Kwiatek; Dino Bindi; Dirk Becker; Marco Bohnhoff; Fabrice Cotton; Patricia Martínez‐Garzón
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Seismic Energy Radiated by Earthquakes in the North‐Central Region of the Gulf of California, Mexico
Favio Cruz Hernández; Raúl R. Castro
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Time‐Dependent Stress Drop Variations After Large Earthquakes Along the North Chilean Megathrust
Jonas Folesky; Jörn Kummerow
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Numerical Tests to Evaluate the Effect of Constraining the Spectral Shape of Reference Events on Source Parameter Scaling
Dino Bindi; Kevin Mayeda; Daniele Spallarossa; Matteo Picozzi; Adrien Oth; Paola Morasca; William R. Walter
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On Seismological Stress‐Drop Estimates for Earthquake Sources Simulated on Rate‐and‐State Faults
Yen‐Yu Lin; Natalie Schaal; Nadia Lapusta
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Earthquake Stress Drop, Source Spectra from Laboratory Experiments, and the Apparent Unsteadiness of Frictional Slip
Brian Kilgore; N. M. Beeler
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Comparison of EGF Methods for Ridgecrest Sequence: Can EGFs Help Resolve Ambiguity in Isolating Source Spectra?
Rachel E. Abercrombie; Xiaowei Chen; Yihe Huang; Shanna Chu
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The Impact of Source Time Function Complexity on Stress‐Drop Estimates
James S. Neely; Sunyoung Park; Annemarie Baltay
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Resolving the Variability Discrepancy between Peak Ground Acceleration and Spectral Stress Drop: Insight from Double‐Corner‐Frequency Spectra
Shota Shimmoto; Hiroe Miyake
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Characterizing Directivity in Small (M 2.4–5) Aftershocks of the Ridgecrest Sequence
Shanna Chu; Annemarie Baltay; Rachel Abercrombie
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Investigating Corner‐Frequency Uncertainties: Insights from Six Earthquakes (⁠Mw 3.2–3.8) in Ridgecrest, California, and the Korean Peninsula
Minkyung Son; Esteban J. Chaves
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Kinematic Source Modeling Using Radiation‐Corrected Empirical Green’s Functions in Waveform Inversion
Ritsuya Shibata; Naofumi Aso
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Toward a Better Understanding of Spatiotemporal Rupture Evolution Through a Concrete Accounting of Site Effects: The Iwate–Miyagi 2008 Case
Ioannis Fountoulakis; Olga‐Joan Ktenidou; Pierre‐Yves Bard; Christos P. Evangelidis; Efthimios Sokos
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Effect of Time Window and Spectral Measurement Options on Empirical Green’s Function Analysis Using DAS Array and Seismic Stations
Xiaowei Chen; Jiuxun Yin; Colin Pennington; Qimin Wu; Zhongwen Zhan
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Earthquake Source Parameter Estimation Using Distributed Acoustic Sensing and Frequency Wavenumber Scaling
Itzhak Lior
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Seismic Moment and Local Magnitude Scales in Ridgecrest, California, from the SCEC/USGS Community Stress Drop Validation Study
Annemarie Baltay; Rachel E. Abercrombie
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Quantifying Magnitude Uncertainty of the 2019 Ridgecrest Earthquake Sequence Through a Sensitivity Study of the Relative Magnitude Method
Sydney L. Gable; Yihe Huang
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Exploring Uncertainty in Moment Estimation for Small Earthquakes in Southern Nevada Using the Coda Envelope Method
Anne M. Patton; Colin N. Pennington; William R. Walter; Daniel T. Trugman
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Coda Envelope Moment Magnitudes and Source Scaling for Southeastern Canada
Allison L. Bent; Kevin Mayeda; Jorge I. Roman‐Nieves; Justin Barno
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Using a 1D Radially Symmetric Coda Envelope Model for Robust Moment Magnitude (⁠Mw⁠) Estimation in Iraq’s Tectonically Diverse Zones
Muntadher Al‐Kaabi; Kevin Mayeda; Jorge Roman‐Nieves; Andrea Chiang; Hanan Mahdi; Haydar Al‐Shukri
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Energy‐Magnitude Station Corrections across the Conterminous United States
Dino Bindi; Domenico Di Giacomo
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Centroid Full Moment Tensor Patterns of Induced Mw 0.3–2.0 Earthquakes in the Fennoscandian Shield
Annukka E. Rintamäki; Gregor Hillers; Sebastian Heimann; Torsten Dahm; Annakaisa Korja
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  • Cover Image

    Cover Image

    issue cover

    The captivating cover photo (taken 07 July 2019) features an aerial view of the rupture zone of the Mw 7.1 Ridgecrest earthquake of 05 July 2019. Taken only two days after this important temblor, the most powerful earthquake to occur in California in 20 years since the 1999 Hector Mine event, the photo shows a dirt road right-laterally displaced by ∼3 m due rupture on the Paxton Ranch fault (about 15 km northeast of the town Ridgecrest, view to southwest). Also, notice the substantial ground failure and surfical cracking off the main fault trace indicating strong off-fault deformation as part of the dynamic rupture process. This issue of the Bulletin of the Seismological Society of America is dedicated to the Special Issue on “Improving Measurements of Earthquake Source Parameters,” comprising in total 39 articles of which many are based on a curated aftershock dataset recorded after the Mw 7.1 Ridgecrest earthquake.

    Image credit: Christopher B. DuRoss/U.S. Geological Survey

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  • Online ISSN 1943-3573
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