The Loma Prieta earthquake of October 18, 1989: Results of teleseismic mantle and body wave inversion

Journal Article · Sun Jul 01 04:00:00 EDT 1990 · Geophysical Research Letters (American Geophysical Union); (USA)

DOI:https://doi.org/10.1029/GL017i008p01191· OSTI ID:6206001

Romanowicz, B; Lyon-Caen, H ^[1]

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1. Centre National de la Recherche Scientifique, Paris (France)

The authors 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 modeling 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.

• OSTI ID: 6206001
• Journal Information: Geophysical Research Letters (American Geophysical Union); (USA), Journal Name: Geophysical Research Letters (American Geophysical Union); (USA) Vol. 17:8; ISSN GPRLA; ISSN 0094-8276
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
CALIFORNIA
CONTINENTAL CRUST
DATA ANALYSIS
EARTH CRUST
EARTH MANTLE
EARTHQUAKE MAGNITUDE
EARTHQUAKES
FEDERAL REGION IX
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
MECHANICS
NORTH AMERICA
RAYLEIGH WAVES
ROCK MECHANICS
SEISMIC EVENTS
SEISMIC SOURCES
SEISMIC SURFACE WAVES
SEISMIC WAVES
SLIP
USA
WAVE PROPAGATION