In:
Bulletin of the Seismological Society of America, Seismological Society of America (SSA), Vol. 87, No. 1 ( 1997-02-01), p. 272-276
Abstract:
The MW = 5.0, 19 June 1994 offshore Petrolia, California, earthquake was well recorded by nine ocean-bottom hydrophones (OBH) and seismometers (OBS), providing an opportunity to precisely locate an earthquake in the tectonically active Mendocino triple junction region. Adding the offshore data improves the azimuthal station coverage and essentially removes the epicenter's sensitivity to the choice of inversion parameters and velocity models. The hypocentral parameters, assuming an oceanic upper-mantle velocity of 7.9 km/sec, are 10:39:33.2 UTC for origin time, 40.376° N latitude, 124.441° W longitude, and a depth of 18.8 km. The moment-tensor solution obtained by modeling of low-frequency regional waveforms indicates predominantly strike-slip faulting with a north-south-trending P axis, as is typical for Gorda plate earthquakes, and confirms the depth estimate from the P-wave travel-time data.
Type of Medium:
Online Resource
ISSN:
1943-3573
,
0037-1106
DOI:
10.1785/BSSA0870010272
Language:
English
Publisher:
Seismological Society of America (SSA)
Publication Date:
1997
detail.hit.zdb_id:
2065447-9
SSG:
16,13
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