Significance of non-double couple components of deep and intermediate-depth earthquakes: implications from moment tensor inversions of long-period seismic waves

Details Significance of non-double couple components of deep and intermediate-depth earthquakes: implications from moment tensor inversions of long-period seismic waves Significance of non-double couple components of deep and intermediate-depth earthquakes: implications from moment tensor inversions of long-period seismic waves

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...75..243k&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 75, Issue 4, p. 243-266.

Physics

20

Scientific paper

Analysis of long-period seismic waves suggests that non-double couple components in source moment tensors of intermediate-depth and deep earthquakes are significant and appear to respond to the state of predominant strain release within slabs. The strain regime is partially or fully induced by the sources themselves or by slab structures near the sources. We observe consistency in the non-double couple components from three different seismic wave inversions. Among 21 earthquakes studied, 17 events have the same sign in the three non-double couple components, and the signs show a correlation with the state of strain release within the slabs. The effects of unmodeled propagation structure and instability of the inversion procedure are unlikely to be responsible for the consistent non-double couple components because the suites of seismic waves traverse different paths and the various inversion schemes have the different resolvabilities of the moment tensors.

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