Interpretation of earthquake epicenter and CMT centroid locations, in terms of rupture length and direction

Details Interpretation of earthquake epicenter and CMT centroid locations, in terms of rupture length and direction Interpretation of earthquake epicenter and CMT centroid locations, in terms of rupture length and direction

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pepi..102..123s&link_type=abstract

Physics of the Earth and Planetary Interiors, v. 102, p. 123-132.

Physics

11

Scientific paper

A comparison is made between hypocenter and centroid estimates of shallow earthquakes to investigate whether the difference between these two quantities contains useful information on fault rupture length and direction. An initial comparison of International Seismological Centre (ISC) and Harvard centroid-moment tensor (CMT) catalog locations suggests that for earthquakes below MW ~ 6.5 the difference in location is dominated by location errors, whilst larger earthquakes appear to show the effect of increasing spatial rupture. However, for this data set combined location errors greater than 25 km are observed for a majority of earthquakes imposing a limit on interpretation. We use these constraints to investigate this approach using a consistent Earth model in the re-analysis of eight, previously well-studied, events. New hypocenter estimates based on teleseismic P-wave arrivals from the ISC Bulletin and a 3-D velocity model of the mantle (S&P12/WM13) are compared with new centroid locations obtained using the same 3-D model, and waveform data from International Deployment of Accelerometers (IDA), Global Digital Seismic Network (GDSN), and re-calibrated high-gain, long-period (HGLP) stations. The distance between our new hypocenter and centroid locations is shown to provide reliable information on both the rupture length and direction. The rupture lengths and azimuths generally agree with the most recent, previous results from other methods and provide an absolute estimate of the location of the rupture.

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