Origin of short-period signals following P-diffracted waves: A case study of the 1994 Bolivian deep earthquake

Details Origin of short-period signals following P-diffracted waves: A case study of the 1994 Bolivian deep earthquake Origin of short-period signals following P-diffracted waves: A case study of the 1994 Bolivian deep earthquake

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pepi..103....1t&link_type=abstract

Physics of the Earth and Planetary Interiors, v. 103, p. 1-16.

Physics

1

Scientific paper

Seismograms of the June 9, 1994, Bolivian deep earthquake recorded at epicentral distances from 100° to 122° show a train of signals with predominant frequencies between 1 and 2 Hz after the arrivals of short-period diffracted P-waves (Pdiff). We investigate the origin of these signals following Pdiff by analyzing a total of 20 records from the IRIS broad-band network and the short-period network of New Zealand. The arrivals of late signals continue for over 100 s, that is two times longer than the estimated source duration of this event. Subsequent aftershocks, which cause the following signals, are not expected from the long-period records. These results indicate that the long continuation of short-period signals is not due to the source complexities. The signals following Pdiff have small incident angles, and their spectra show peaks at about the same frequencies. These characteristics of the following signals exclude the possibility that their origin is shallow structure such as the heterogeneities beneath the stations or upper mantle. Pdiff propagates a long distance within the heterogeneous region near the core-mantle boundary. We conclude that the short-period signals following the main Pdiff are scattered waves caused by small-scale heterogeneities near the core-mantle boundary.

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