Geodetic estimate of coseismic slip during the 1989 Loma Prieta, California, earthquake

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

DOI:https://doi.org/10.1029/GL017i009p01437· OSTI ID:6205780

Lisowski, M; Prescott, W H; Savage, J C; Johnston, M J ^[1]

---

1. Geological Survey, Menlo Park, CA (USA)

Offsets in the relative positions of geodetic stations resulting from the Loma Prieta earthquake can be explained with a dislocation model that includes buried oblique slip on a rupture surface extending 37 km along the strike of the San Andreas fault, dipping 70{degree} to the SW, and extending from a depth of about 5 to 17.5 km. Assuming uniform slip on a rectangular surface, the mean values for a range of reasonable fault geometries are 1.6{plus minus}0.3 m right-lateral strike slip and 1.2{plus minus}0.3 m reverse slip. Slip on an adjacent extension of the rupture to the southeast, recorded in the aftershock sequence, is not well constrained by the geodetic data. The geodetic data clearly preclude rupture extending near the surface.

• OSTI ID: 6205780
• Journal Information: Geophysical Research Letters (American Geophysical Union); (USA), Journal Name: Geophysical Research Letters (American Geophysical Union); (USA) Vol. 17:9; ISSN 0094-8276; ISSN GPRLA
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
CALIFORNIA
DATA ANALYSIS
DEPTH
DIMENSIONS
EARTHQUAKES
FAILURES
FEDERAL REGION IX
GEODETIC SURVEYS
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
GEOPHYSICAL SURVEYS
GROUND MOTION
MECHANICS
MOTION
NORTH AMERICA
ROCK MECHANICS
RUPTURES
SEISMIC EFFECTS
SEISMIC EVENTS
SEISMIC SOURCES
SLIP
SURVEYS
USA