The scatter of time-delays in shear-wave splitting above small earthquakes

Details The scatter of time-delays in shear-wave splitting above small earthquakes The scatter of time-delays in shear-wave splitting above small earthquakes

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004geoji.156...39c&link_type=abstract

Geophysical Journal International, Volume 156, Issue 1, pp. 39-44.

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Scientific paper

Measurements of time-delays in seismic shear-wave splitting above small earthquakes typically display a scatter of often as much as +/-80 per cent about the mean. Changes in the average time-delay appear to be related to changes of stress, but applications of this potentially powerful tool have been handicapped by the previously inexplicable scatter in time-delays above earthquakes. In contrast, measurements of shear-wave time-delays in controlled-source exploration seismics are typically well controlled and display little scatter. Previous estimates of possible causes of scatter cannot produce sufficient variation specifically above earthquakes. Here we show that 90°-flips in shear-wave polarizations due to fluctuating high pore-fluid pressures on seismically-active fault planes are the most likely cause of the scatter.

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