ANSS Seminar 7/17: Yifan Yu, Stanford University
Barnhart, William D
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Hello Network Seismology Community and Beyond! Join us for our next seminar! July 17th, 2 pm MT: Yifan Yu - Stanford - "Accuracy and Precision of Earthquake Location Programs: Insights from a Synthetic Controlled Experiment" Click this link to join!
Abstract: Accurate and reliable earthquake locations are essential for seismic network operations, whether for real-time monitoring, catalog development, or hazard assessment. However, location performance varies widely across programs due to differences in how they address the challenges posed by incomplete knowledge and simplified representation of complex Earth structures. Assessing their reliability in location and uncertainty characterization remains challenging as benchmark datasets with known event locations are rare, and usually confined to particular sources, such as quarry blasts. This study evaluates eight earthquake location methods (GrowClust, HypoDD, Hypoinverse, HypoSVI, NonLinLoc, NonLinLoc_SSST, VELEST, and XCORLOC) through a controlled synthetic computational experiment based on the setting of the 2019 Ridgecrest, California, earthquake sequence. Our benchmark dataset includes 3D travel-time calculations based on a Community Velocity Model with realistic topography and heterogeneity, and incorporates phase picking errors, partial data coverage, and outliers. Each location method is applied using a simplified 1D velocity model, we then assess both location accuracy, precision, and how well each method quantifies its own uncertainty.
Do you have an idea for a seminar topic? Get in touch with the seminar committee (Will Yeck, Gabrielle Tepp, Fabia Terra, Mairi Litherland, Kyren Bogolub, and Bill Barnhart) |
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William Barnhart, PhD
Assistant Coordinator
USGS Earthquake Hazards Program
c: 319-834-0674
o: 303-273-8591