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Moment tensor estimation using regional seismograms from a Tibetan Plateau portable network deployment
Author(s) -
Randall George E.,
Ammon Charles J.,
Owens Thomas J.
Publication year - 1995
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 - 10.1029/95gl00909
Subject(s) - seismogram , geology , plateau (mathematics) , seismology , moment tensor , extensional definition , seismic moment , focal mechanism , geodesy , tectonics , fault (geology) , deformation (meteorology) , mathematical analysis , oceanography , mathematics
We present the results of moment tensor inversions using regional seismograms recorded during the 1991–1992 PASSCAL passive seismic experiment on the Tibetan Plateau. Using data recorded over a one‐year period, we estimate the source mechanisms for 38 earthquakes within and near the Tibetan Plateau with moment‐magnitudes (M w ) ranging from 3.8 to 5.0. With only one exception, all the events within the Plateau, but away from the Plateau boundary, indicate either strike‐slip or extensional faulting, a result consistent with previous studies. Three‐fourths of all the events occurred at depths less than 10 km, and all but two depths less than 15 km. Several events, located near the southeastern section of the Plateau, exhibit an unusual m b ‐M w difference of approximately one magnitude unit.