zmap a tool for analyses of seismicity patterns typical applications ...

Figure 5.14. Image showing the distribution of average misfit values F in map view. Red colors indicate a
low average misfit and thus good compliance with the assumed theoretical stress field. This map shows the
Parkfield segment of the san Andreas fault. The theoretical stress filed was given as (151 deg az, 2 deg
plunge, R=0.9, Phi = 1).
Figure 5.15. Image showing the distribution of average misfit values F in cross-section
view.
References
Gephart, J.W., FMSI: A FORTRAN program for inverting fault/slickenside and
earthquake focal mechanism data to obtain the original stress tensor, Comput. Geosci.,
16, 953-989, 1990a.
Gephart, J.W., Stress and the direction of slip on fault planes, Tectonics, 9, 845-858,
1990b.
Gephart, J.W., and D.W. Forsyth, An Improved Method for Determining the Regional
Stress Tensor Using Earthquake Focal Mechanism Data: Application to the San Fernando
Earthquake Sequence, Journal of Geophysical Research, 89, 9305-9320, 1984.
Gillard, D., M. Wyss, and P. Okubo, Stress and strain tensor orientations in the south
flank of Kilauea, Hawaii, estimated from fault plane solutions, Journal of Geophysical
Research, 100, 16025-16042, 1995.
Hardebeck, J.L., and E. Hauksson, Stress orientations obtained from earthquake focal
mechanisms: What are appropriate uncertainty estimates?, Bulletin of the Seismological
Society of America, 91 (2), 250-262, 2001.
Lu, Z., and M. Wyss, Segmentation of the Aleutian plate boundary derived from stress
direction estimates based on fault plane solutions, Journal of Geophysical Research, 101,
803-816, 1996.
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