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WITHDRAWN Uncertainty in Source Location Estimates Using a Single Seismic Station

Description: 

WITHDRAWN Poorly recorded seismic events, particularly small magnitude events occurring in regions with sparse station coverage, are often difficult or impossible to relocate using standard methods based on seismic arrival times. When data are only available from a single seismic station, distance and backazimuth may be estimated from the three-component waveforms, however polarization analyses and particle motion are highly sensitive to local variations in the wavefield. These localized variations make it necessary to include robust estimations of uncertainty when using these methods to identify the source region for a small natural or anthropogenic seismic event. Here we present single-station estimates of backazimuth and distance for a variety of well-recorded seismic events in the western U.S. to investigate the uncertainty associated with these source location estimates. We consider sensitivity parameters associated with data quality control (QC) and processing of the three-component waveforms for a range of source types including shallow crustal earthquakes, borehole explosions, and mining-related surface explosions. We utilize data recorded as part of the EarthScope Idaho-Oregon (IDOR) project as well as regional monitoring network data from Utah and Nevada. We compare results for backazimuth predictions from approximately co-located explosive and earthquake sources, as well as variations in the accuracy of source location estimations from stations at local to regional distances for a single event.

SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.

Session: It’s All About Relocation, Relocation, Relocation [Poster]

Type: Poster

Date: 4/20/2023

Presentation Time: 08:00 AM (local time)

Presenting Author: Sarah A. Nolt-Caraway

Student Presenter: No

Invited Presentation: 

Authors