Anomalous aftershocks of deep earthquakes in Mariana

Details Anomalous aftershocks of deep earthquakes in Mariana Anomalous aftershocks of deep earthquakes in Mariana

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1977w&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 13, p. 1977-1980

Physics

4

Seismology: Earthquake Parameters, Seismology: Earthquake Dynamics And Mechanics, Tectonophysics: Stresses-Deep-Seated, Seismology: Seismicity And Seismotectonics

Scientific paper

Seismic moment of aftershocks during the August 23, 1995 deep earthquake sequence in the Mariana amounts up to 17% of that of the main shock (Mw 7.0). Such a high aftershock activity is extremely unusual. Based on the inversion of broadband P and SH waveforms, however, we found nothing anomalous in the source mechanisms. Among the 33 largest deep earthquakes (Mw>=7.0) since 1958, only events in the Mariana have high aftershock activity. We associate this observation with the unique configuration of the Mariana slab which seems to plunge sub-vertically into the lower mantle with little distortion.

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