An appraisal of aftershocks behavior for large earthquakes in Persia

作者：Nemati Majid^*

来源：Journal of Asian Earth Sciences, 2014, 79: 432-440.

DOI：10.1016/j.jseaes.2013.10.015

• Aftershock
• Sequence
• Persia
• Earthquake
• ISC
• IGUT
• Magnitude

This study focuses on the distribution of aftershocks in both location and magnitude for recent earthquakes in Iran. 43 Earthquakes are investigated, using data from the global International Seismological Center (ISC) seismic catalogue and from the regional earthquake catalogue of the Institute of Geophysics, University of Tehran (IGUT) between 1961-2006 and 2006-2012 respectively. We only consider the earthquakes with magnitude greater than 5.0. The majority of these events are intracontinental, occurring over four seismotectonic provinces across Iran. Processing aftershock sequences reported by both catalogues with cut-off magnitude of 2.5 and a sequence duration of 70 days, leads us to define a spatial horizontal area (A) occupied with the aftershocks as a function of mainshock magnitude (M) for Persian earthquakes: ISC: Log(10)(A) = 0.45M(S) + 0.23; IGUT: Log(10)(A) = 0.25M(N) + 1.7.
Also we found a range for the difference between the magnitudes of the strongest aftershock and of the mainshock in each sequence, which varies from 0.9 (ISC) to 1.27 (IGUT). Finally, the spacial distribution of the aftershocks corresponds reasonably well to the causative fault planes of earthquakes.

• 出版日期2014-1-5