Interpretation of Strong-Motion Earthquake Accelerograms: The Bear Valley Event of 1973
Abstract
The solutions to eight earthquakes have been obtained from near-field strong-motion accelerograms using Haskell's moving dislocation source model. In particular, the solutions to the San Fernando main shock and three small aftershocks were re-examined using the corrected orientation of the Pacoima Dam instruments. A reasonable match to the observed waveforms for the main event could only be obtained by having a large strikeslip dislocation component on the deeper segments of the fault. Also, new locations and orientations were obtained for the three small aftershocks. Using both Haskell's model and spectral analysis, the Bear Valley earthquake of June 22, 1973 was examined. Both approaches yielded substantially the same results; a large dislocation on the order of 100 cm over a small fault area of less than 1.0 sq km, with a seismic moment (Mo) of 1.2 to 1.5 x 10 to the 25th power dyne-cm.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1974
- Accession Number
- AD0785418
Entities
People
- James C. Battis
- Lawrence S. Turnbull Jr.
Organizations
- Texas Instruments