Investigation of Makran seismicity in southeast Iran, before and after 2011 Dalbandin earthquake of Pakistan with Mw: 7.2

Authors

1 Department of Geology, Faculty of Sciences, Golestan University, Gorgan, Iran

2 Department of Statistics, Faculty of Sciences, Golestan University, Gorgan, Iran

Abstract

From 2011 to 2013, several major earthquakes occurred in the Makran Seismotectonic zone (Iran and Pakistan). The low event interval of these earthquakes in a tectonic zone may indicate their interaction. In this paper, the interactions between 2011 Dalbandin earthquake of Pakistan, 2013 Saravan and Goharan earthquakes of Makran seismotectonic zone in SE Iran was investigated by calculating the Coulomb stress changes. Maps and cross sections of coseismic stress changes show that Saravan and Goharan earthquakes have occurred in the stress enhanced areas indicating the positive effect of Dalbandin earthquake on trigerring the mentioned events. In order to quantify the seismicity level changes, statistical parameters including b-value, seismicity rate and temporal changes of local standard deviation of gradient (lsd) were calculated over a 10 year period (5 years before and after the Dalbandin earthquake).The results show that the seismicity rate of Makran seismotectonic zone has significantly increased after this event. The temporal variation graph of lsd parameter also decreases at the time of the Dalbandin earthquake event, indicating an increase in seismicity rate in the region. In overall, the results indicate that the Dalbandin earthquake is the beginning of an active seismic period in the Makran subduction zone on which the peak of activity occurred in 2013 with two years delay.

Keywords

References

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Advanced Applied Geology
Volume 10, Issue 4
January 2021
Pages 570-584

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