Strong seismic scatterers near the core-mantle boundary west of Mexico

Details Strong seismic scatterers near the core-mantle boundary west of Mexico Strong seismic scatterers near the core-mantle boundary west of Mexico

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3557n&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 18, p. 3557-3560

Physics

11

Seismology, Seismology: Body Wave Propagation, Seismology: Core And Mantle

Scientific paper

PKP phases observed in Japan show strong precursors with clear onsets for earthquakes that occurred in south America. The onset times of the PKP precursors can all be explained by existence of seismic scatterers in the lowermost 100 km of the mantle west of Mexico, within an area of 200km×300km. Forward modeling of PKP precursor amplitudes indicates that a P-wave velocity variation of at least 6% is required to explain the large amplitudes of the observed PKP precursors, suggesting that the core-mantle boundary region beneath west of Mexico is a highly anomalous region characterized by strong seismic scatterers.

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