Investiagtion of mantle discontinuities from a single deep earthquake

Details Investiagtion of mantle discontinuities from a single deep earthquake Investiagtion of mantle discontinuities from a single deep earthquake

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.1495e&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 14, p. 1495-1498

Physics

3

Earth Mantle, Earthquakes, Mathematical Models, P Waves, Seismic Waves, Seismograms, Seismology, Arrays, Broadband, Discontinuity, S Waves, Structural Properties (Geology)

Scientific paper

Converted phases have been identified in the P-wave coda of teleseismic seismograms from a single large (M(sub W) 6.8), deep (360 km) earthquake south of Honshu, Japan. Standard array techniques (slantstacking), applied to broadband data from the global broadband network, the German Regional Seismic Network (GRSN) and the Graefenberg (GRF) array, and synthetic seismogram modeling, reveal that these unusual phases are S to P conversions from under the seismic source. Timing of the converted phase indicates that subduction has had little, if any, effect on the depth of the '660 km' discontinuity. This study shows that upper mantle seismic structure can be constrained from single events using the presently available broadband seismic data and applying array techniques to network data.

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