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1 Seismological
Laboratory
California Institute of Technology
Pasadena, California
91125
hauksson{at}gps.caltech.edu
(E.H.)
2 Institute of Geophysics and Planetary
Physics
Scripps Institution of Oceanography
University of California at
San Diego
La Jolla, California
92093-0225
pshearer{at}ucsd.edu
(P.M.S.)
We present the results of relocating 327,000 southern California earthquakes
that occurred between 1984 and 2002. We apply time-domain waveform
cross-correlation for P and S waves between each event and 100
neighboring events identified from the catalog based on a 3D velocity model. To
simplify the computation, we first divide southern California into five
polygons, such that there are 
100,000 events or less in each region. The
polygon boundaries are chosen to lie in regions of sparse seismicity. We
calculate and save differential times from the peaks in the cross-correlation
functions and use a spline interpolation method to achieve a nominal timing
precision of 0.001 sec. These differential times, together with existing
P- and S-phase picks, are input to the double-difference
program of Waldhauser and
Ellsworth (2000,
2002) to
calculate refined hypocenters. We divide the southern California region into
grid cells and successively relocate hypocenters within each grid cell. The
overall resulting pattern of seismicity is more focused than the previously
determined pattern from 1D or 3D models. The new improved locations are more
clustered, in many cases by a factor of two or three, and often show clear
linear alignments. In particular, the depth distribution is improved and less
affected by layer boundaries in velocity models or other similar artifacts.
This article has been cited by other articles:
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