The Temporal Distribution of Seismic Radiation During Deep Earthquake Rupture

Details The Temporal Distribution of Seismic Radiation During Deep Earthquake Rupture The Temporal Distribution of Seismic Radiation During Deep Earthquake Rupture

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994sci...265..771h&link_type=abstract

Science, Volume 265, Issue 5173, pp. 771-774

Physics

18

Scientific paper

The time history of energy release during earthquakes illuminates the process of failure, which remains enigmatic for events deeper than about 100 kilometers. Stacks of teleseismic records from regional arrays for 122 intermediate (depths of 100 to 350 kilometers) and deep (depths of 350 to 700 kilometers) earthquakes show that the temporal pattern of short-period seismic radiation has a systematic variation with depth. On average, for intermediate depth events more radiation is released toward the beginning of the rupture than near the end, whereas for deep events radiation is released symmetrically over the duration of the event, with an abrupt beginning and end of rupture. These findings suggest a variation in the style of rupture related to decreasing fault heterogeneity with depth.

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