Slip distribution of the Lake Tennyson earthquake, New Zealand, as inferred from static stress changes and off fault aftershocks

Details Slip distribution of the Lake Tennyson earthquake, New Zealand, as inferred from static stress changes and off fault aftershocks Slip distribution of the Lake Tennyson earthquake, New Zealand, as inferred from static stress changes and off fault aftershocks

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1961m&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 13, p. 1961-1964

Physics

3

Seismology: Earthquake Dynamics And Mechanics, Seismology: Seismicity And Seismotectonics, Tectonophysics: Dynamics, Seismotectonics, Tectonophysics: Stresses-Crust And Lithosphere

Scientific paper

The fault plane of an earthquake can be estimated in many different ways. One is to examine the distribution of a well located aftershock sequence to see if a fault plane is evident. Here we present a new method where we take an earthquake aftershock sequence with distinguishable off fault clusters and vary the slip distribution to achieve a good correlation between regions of increased Coulomb failure stress (CFS) and aftershock occurrence. We find with the Lake Tennyson earthquake that simply taking an area outlined by aftershocks to estimate a fault plane may not be valid. If we do this, patterns of increased CFS have negative correlation with off-fault aftershock occurrence. However if we restrict slip to only deeper regions, and over a smaller area, then the correlation between regions of increased CFS and aftershock off-fault occurrence is good.

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