Remove aftershocks by windowing procedure and discussion of the independency for main shock sequence by Poisson process
Speaker: Hung-Jung Yeh
Abstract
Gardner and Konpoff think that what happened in South Califonia of a complete earthquake sequence is Non-Poisson process there exists a earthquake cluster in either time domain or spatial domain. After removing foreshocks and aftershocks by time window and distance window, we can get the catalog for independent main shock which matches Non-Poisson process.
Probabilistic seismic hazard analysis often suppose that happening for an earthquake matches Poisson process. But in actual, when the earthquake happens, most of it companing with the foreshocks and the aftershocks. So before we do probabilistic seismic hazard analysis in an area, we should remove the foreshocks and aftershocks which depend on the main shocks. and then do some statics to make sure the progress of earthquake happening in the area matches the assumption of the possibility mode.
Having the catalog for independent main shock and requesting that it must matches the Poisson process, making the possibility of earthquakes doesn’t varies with time.
Reference
Anagnos, T., and Kiremidjian, A. S. (1988). A review of earthquake occurrence models for seismic hazard analysis, Probabilistic Engineering Mechanics, Vol.3, pp.3-11
Gardner, J. K. and L. Knopoff (1974). Is the sequence of earthquakes in Southern California, with aftershocks removed, Poissonian? Bull. Seism. Soc. Am. 64, 1363-1367.