THE DISTRIBUTION OF B-VALUE IN DIFFERENT SEISMIC PROVINCES OF IRAN
The Gutenberg-Richter relation is a well known empirical relation in earthquake seismology which represents the frequency of occurrence of earthquakes as a function of magnitude. The a-value and the b-value are constants of this relation. The a-value is related to the seismic activity and so to the time and the volume of the considered window. The b-value (size distribution) is a measure for the relative abundance of the strong to the weak earthquakes and is considered to be related to the tectonic regime of the area under consideration. The b-value value anomalies may be an indication of the anomaly of the low or the high stress levels, anomaly in the thermal gradient or the crustal heterogeneity. Some studies have discussed the spatial and temporal variations of the b-value before large earthquakes and the spatial variation of the aftershocks. In this paper it has been tried to look into the variations of the b-value and the a-value in different seismic provinces of Iran during last decade. The data has been extracted from the Iranian seismological center (IRSC). Then different relations have been developed for each province.
a-value b-value Gutenberg-Richter relation frequency of occurrence spatial and temporal changes.
Mohammad Ashtari Jafari
Institute of Geophysics, University of Tehran, Tehran. Iran
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）