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Seismic transmission survey: Application to real data from microearthquakes
Author(s) -
Katsumata Kei
Publication year - 1993
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 - 10.1029/93gl00732
Subject(s) - geology , seismology , aftershock , classification of discontinuities , seismic survey , mathematics , mathematical analysis
Two discontinuities have been discovered which are closely related to the Philippine Sea (PHS) plate that subducts beneath the Kanto district in Central Honshu, Japan. A seismic transmission survey method is used to image discontinuities in the Earth from mode converted transmission (MCT) waves, and this method is applied to aftershocks of an event which occurred beneath the southern Tokyo Bay at a depth of 100 km. As a result, two predominant interfaces at depths of 24 km and 35 km appear in the section of P→SV MCT waves. This example demonstrates that the seismic transmission survey method proposed by Katsumata (1992) should be very useful in studying fine structure in the Earth. Moreover, it indicates that even microearthquakes can be used as sources for seismic surveys.