Joint statistical determination of fault-plane parameters

Details Joint statistical determination of fault-plane parameters Joint statistical determination of fault-plane parameters

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pepi...30..178u&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 30, Issue 2-3, p. 178-184.

Physics

13

Scientific paper

Joint treatment of first-motion data for sets of earthquakes has great advantages over determinations of individual solutions. An algorithm is used to find maximum-likelihood estimates of the orientations of the P and T axes and of the fault planes (and their variances), together with two precision parameters: ρi, that weights each event according to its agreement with the group solution, and αj, that weights each station according to its performance. The method has been applied to two sets of earthquakes having different characteristics. The first is formed by 19 earthquakes in Bear Valley, CA, with magnitudes of ~3 and recording distances less than 200 km, and the second by 29 microearthquakes with magnitudes of ~1.5 and recorded at distances less than 60 km in the Pyrenees. The data from Bear Valley form a single homogeneous group having a mechanism related to motion on the San Andreas fault. The data from the Pyrenees are divided into five groups having different mechanisms.

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