2011 - Yang, Hauksson and Shearer: Refined earthquake focal mechanism catalog for southern California (1981 - 2010)

A refined earthquake focal mechanism catalog for southern Califiornia using the HASH method and locations derived from waveform cross-correlation. Each focal mechanism is obtained from grid searching for the best-fitting double-couple focal mechanism solution to both the P-wave first motion records that were picked by network analysts, and the S/P amplitude ratios computed from three-component seismograms. This dataset includes around 179,000 focal mechanisms for earthquakes occurring 1981 through 2010 in southern California region.

REFERENCE:

Yang, W., E. Hauksson and P. M. Shearer,Computing a Large Refined Catalog of Focal Mechanisms for Southern California (1981 – 2010): Temporal Stability of the Style of Faulting, Bull. Seism. Soc. Am., Vol. 102, 1179-1294. 2012.

Hauksson E., W. Yang and P. M. Shearer, Waveform relocated earthquake catalog for southern California (1981 - 2011), Bull. Seism. Soc. Am., Vol. 103-104, In Press, 2012.

DOWNLOAD:

Right click or option-click YHS_2010.hash and choose "Save As.../Download Linked File As..."to download the catalog (~20Mb).

DATA FORMAT:

1981 1 1 4 13 55.710 3301565 33.25517 -115.96750 5.680 2.260 318 57 -168 37 39 18 0.17 0 0.00 C

1981 Year
1 Month
1 Day
4 Hour
13 Minute
55.710 Second
3301565 CID
33.25517 Latitude (Degree)
-115.96750 Longitude (Degree)
5.680 Depth (km)
2.260 Magnitude
318 Strike
57 Dip
-168 Rake
37 Fault Plane Uncertainty
39 Auxiliary Fault Plane Uncertainty
18 Number of P wave First Motions
0.17 Misfit of First Motions
0 Number of S/P amplitude ratios
0.00 average log10(S/P amplitude ratio) misfit
C Quality of focal mechanism

UPDATES:

  • Removed entry (CID=3140671), which is a duplicated record for the Northridge mainshock (CID=3144585), but of the teleseismic event type (April 4, 2012)

    Thanks to Men-Andrin Meier for pointing out.

    Last Update: April 4, 2012