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The Loma Prieta Earthquake of October 18, 1989: Results of teleseismic mantle and body wave inversion
Author(s) -
Romanowicz Barbara,
LyonCaen Hélène
Publication year - 1990
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/gl017i008p01191
Subject(s) - geology , seismology , mantle (geology) , geodetic datum , geodesy , geophysics
We present the results of an analysis of teleseismic mantle and body wave data observed on digital very broad band stations for the Loma Prieta earthquake of 10/18/1989. Both datasets yield consistent mechanisms with first motion and geodetic measurements. An interesting result of the mantle wave analysis is the realization of a special relation of the geographical position of this event, its source mechanism and the upper mantle degree 2 heterogeneity. Bodywave modelling indicates that the mechanism may be a double shock and could correspond to partitioning of the fault into thrust and strike slip motion. The available teleseismic data in the appropriate distance range are unfortunately not sufficient to lead, to firm conclusions on this point, which should be tested by local observations.