Correlation between Coulomb stress change and Aftershocks Distribution in Sarpol-e-Zahab Earthquake
عنوان دوره: هجدهمین کنفرانس ژئوفیزیک ایران
نویسندگان
1کارشناس لرزه شناسی شرکت ملی مناطق نفت خیز جنوب
2کارشناس لرزه شناسی، شرکت ملی مناطق نفت خیز جنوب
چکیده
West of Iran experienced a large earthquake in the 2017 November 12 with moment magnitude of 7.3. This event killed about 500 people and caused vast damages in the region. We calculated the static Coulomb stress changes due to this earthquake on the optimally oriented faults to investigate correlation of transferred stress and spatial distribution of aftershocks.
By using slip model from USGS and catalog of the aftershocks from Iranian Seismological Center (ISC) for Sarpol-e-Zahab earthquake we investigated the correlation between Coulomb stress changes and aftershocks distribution. In this study we selected about 300 aftershocks that had magnitude larger than 2.5 and their azimuthal gap were less than 180 degree. Calculated Coulomb stress changes on the optimally oriented faults showed that most of the seismicity occurred in regions of stress increase and majority of them concentrated on the ruptured plane, especially in west and south parts. So there is a good correlation between Coulomb stress changes and aftershocks distribution of Sarpol-e-Zahab events.
کلیدواژه ها
 
Title
Correlation between Coulomb stress change and Aftershocks Distribution in Sarpol-e-Zahab Earthquake
Authors
ahmad amini, gholamreza rastegar movahed
Abstract
West of Iran experienced a large earthquake in the 2017 November 12 with moment magnitude of 7.3. This event killed about 500 people and caused vast damages in the region. We calculated the static Coulomb stress changes due to this earthquake on the optimally oriented faults to investigate correlation of transferred stress and spatial distribution of aftershocks.
By using slip model from USGS and catalog of the aftershocks from Iranian Seismological Center (ISC) for Sarpol-e-Zahab earthquake we investigated the correlation between Coulomb stress changes and aftershocks distribution. In this study we selected about 300 aftershocks that had magnitude larger than 2.5 and their azimuthal gap were less than 180 degree. Calculated Coulomb stress changes on the optimally oriented faults showed that most of the seismicity occurred in regions of stress increase and majority of them concentrated on the ruptured plane, especially in west and south parts. So there is a good correlation between Coulomb stress changes and aftershocks distribution of Sarpol-e-Zahab events.
Keywords
Keywords: Earthquake, Coulomb stress changes, Aftershocks, West of Iran