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The coseismic geodetic signature of the 1999 Hector Mine earthquake
Author(s) -
Hurst Kenneth J.,
Argus Donald F.,
Donnellan Andrea,
Heflin Michael B.,
Jefferson David C.,
Lyzenga Gregory A.,
Parker Jay W.,
Smith Mark,
Webb Frank H.,
Zumberge James F.
Publication year - 2000
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 - 10.1029/2000gl011841
Subject(s) - geology , seismology , geodetic datum , fault trace , geodesy , global positioning system , slip (aerodynamics) , moment magnitude scale , seismic moment , fault (geology) , geometry , mathematics , telecommunications , physics , scaling , computer science , thermodynamics
The M = 7.1 Hector Mine earthquake ruptured the Lavic Lake fault near Twentynine Palms, CA at 09:46 UTC October 16, 1999. Because it occurred near the eastern edge of the Southern California Integrated GPS Network (SCIGN), a network of permanent, continuously recording GPS receivers for measuring the crustal deformation field around Los Angeles, CA, it was possible to determine the deformation associated with the earthquake with unprecedented speed and reliability. Thirty‐four stations recorded displacements over the 3‐sigma level. The displacements measured with GPS can be modeled by a fault 46.2±2.6 km long, 8.2±1.0 km wide, striking 330°, dipping 84° east, with 301±36 cm right lateral strike‐slip, and 145±36 cm of east‐up dip‐slip, yielding a potency of 1.3 km³ and geodetic moment of 3.8 × 10 26 dyne‐cm. The trace and dip of the model fault is consistent with the observed ground rupture and seismic focal mechanisms.