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Investigation of mantle discontinuities from a single deep earthquake
Author(s) -
Estabrook Charles H.,
Bock Günter,
Kind Rainer
Publication year - 1994
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/94gl01080
Subject(s) - geology , seismology , seismogram , classification of discontinuities , seismic array , broadband , coda , subduction , mantle (geology) , discontinuity (linguistics) , geophysics , tectonics , telecommunications , computer science , mathematical analysis , mathematics
Converted phases have been identified in the P‐wave coda of teleseismic seismograms from a single large (M 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 Gräfenberg (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.