The comparison of stress changes from earthquake rate
changes and near-surface deformation
Speaker: I-Ming, Tai
Abstract
Stress changes in the Earth's crust are generally estimated from model calculations that use near-surface deformation as an observational constraint. Stress changes might be calculated from earthquake occurrence rates obtained from seismicity catalogues. We compare the stress changes from different data set. Because the nonlinearity of earthquake rate changes with resp ect to both
stress and time, the method has not yet proven successful.
However, we use two methods for inverting earthquake rate data to infer stress changes, using a formulation for the stress- and time-dependence of earthquake rates.
Final, calculation of stress change from deformation model and earthquake rates are consistent.
Reference
Dieterich, J. H., Cayol, V., Okubo, P. (2000), The use of earthquake rate changes as a stressmeter at Kilauea volcano, Nature.
Deng, J., Sykes,L. R. (1997), Evolution of the stress field in southern California and triggering of moderate-size earthquakes: A 200-year perspective, J.Geophys. Res., VOL.102, NO. B5, PAGES 9859-9886.