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Slip history of the 2003 San Simeon earthquake constrained by combining 1‐Hz GPS, strong motion, and teleseismic data
Author(s) -
Ji Chen,
Larson Kristine M.,
Tan Ying,
Hudnut Kenneth W.,
Choi Kyuhong
Publication year - 2004
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 - 10.1029/2004gl020448
Subject(s) - hypocenter , geology , seismology , geodesy , global positioning system , fault trace , slip (aerodynamics) , seismic moment , rake , inversion (geology) , induced seismicity , fault (geology) , tectonics , physics , telecommunications , paleontology , computer science , thermodynamics
The slip history of the 2003 San Simeon earthquake is constrained by combining strong motion and teleseismic data, along with GPS static offsets and 1‐Hz GPS observations. Comparisons of a 1‐Hz GPS time series and a co‐located strong motion data are in very good agreement, demonstrating a new application of GPS. The inversion results for this event indicate that the rupture initiated at a depth of 8.5 km and propagated southeastwards with a speed ∼3.0 km/sec, with rake vectors forming a fan structure around the hypocenter. We obtained a peak slip of 2.8 m and total seismic moment of 6.2 × 10 18 Nm. We interpret the slip distribution as indicating that the hanging wall rotates relative to the footwall around the hypocenter, in a sense that appears consistent with the shape of the mapped fault trace.