Introduction

This research seeks to apply a regional distance complete moment tensor approach to tectonic and man-made seismic events in order to document performance in the ability to identify and characterize anomalous (non-double-couple) seismic radiation. Identification of events with demonstrably significant non-double-couple components can aid in discrimination and possibly yield determination (Given and Mellman, 1986; Patton, 1988; Dreger and Woods, 2002). As an initial application we calculate the full moment tensors of 17 nuclear tests at the Nevada Test Site (NTS), three collapses (two mine collapses and one explosion cavity collapse), and 12 earthquakes near the NTS.

We implement the time-domain full regional waveform inversion for the complete moment tensor (2nd rank tensor, $M_{ij}$) devised by Minson and Dreger (2007) after Herrmann and Hutcheson (1993) based on the work of Langston (1981). Data are collected for a total of 55 stations from the US National Seismic Network, IRIS/USGS, Berkeley Digital Seismic Network, Trinet, and the Lawrence Livermore National Laboratory (LLNL) network. We remove the instrument response, rotate to the great-circle frame, integrate to obtain displacement, and filter similarly to the synthetic seismograms.

Berkeley Seismological Laboratory
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