Estimation of maximum horizontal acceleration of earthquakes in Kerman province using probability method

Document Type : Research Article

Authors

1 Civil Engineering Department, Technical and Engineering Faculty of Shahid Bahonar University of Kerman

2 1- Department of Geology, Faculty of Science and Earthquake Research Center of Shahid Bahonar University of Kerman

Abstract

Despite occurring devastating events such as the 2003 Bam earthquake (M_w~6.6), it is essential to develop up-to-date earthquake hazard maps to design structures in area. In this study, which is a research with practical results in the field of seismic engineering, a seismic catalog including historical and instrumental events was compiled and then 21 seismic sources were identified in the cities of Kerman province and its surrounding. Seismicity parameters were estimated for all 21 source zones and an attenuation relationship was selected for obtain local site effect-based seismic hazard maps. Finally, seismic hazard map, which is one of the most basic requirements of seismic design and seismic regulations, were presented in the form of the peak ground acceleration (PGA) measures, for the return period of 475 and 2475 years, and high risk areas in Kerman Province were introduced. To investigate the depth of events in Iran, according to the studies conducted in this study, it is suggested to use only the data obtained from local seismic networks. The results of this study were presented as seismic hazard maps for the parameters of maximum intensity of horizontal ground acceleration and taking into account construction effects with a probability of 2% and 10% over 50 years for all Kerman provinces to provide all design needs according to 2800 regulations. Using the maps obtained in this study, the earthquake parameter in the Iranian Seismic Code (Code 2800) can be updated. Results of this study show that, as expected, two areas in Kerman are shown with the highest accelerations: The first is the Kuhbanan-Golbaf-Bam fault systems with northwest-southeast trend and the second is the northeast termination of the Zagros toward Makran. Both of these ranges are seismic and are of great importance in seismic surveys. These areas include Kuhbanan-Golbaf-Bam fault systems and Jiroft-Kahnooj areas.

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  • Receive Date: 10 December 2021
  • Revise Date: 15 February 2022
  • Accept Date: 20 February 2022
  • First Publish Date: 20 February 2022