Aftershocks of Some Major Earthquakes in the Iranian Plateau

عنوان دوره: نوزدهمین کنفرانس ژئوفیزیک ایران
کد مقاله : 1485-NIGS
نویسندگان
1گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه اردکان، اردکان، ایران
2Mahan Geophysical Consulting Inc., 304-1399 Stanley Ave., Victoria, British Columbia, Canada V8S 3S5
چکیده
We analyze aftershock sequences following major earthquakes within the Iranian Plateau. Using the dataset prepared by Mousavi-Bafrouei and Babaie Mahani (2020), we obtain seismological parameters for the aftershocks of 12 earthquakes with moment magnitude (Mw) between 6.1 and 7.8 that occurred between 2005 and 2017. For each sequence, we calculate magnitude of completeness (Mc) based on stability of the Gutenberg-Richter b-value followed by calculation of the Omori’s law parameters for decay rate of aftershocks. Most aftershock sequences show similar Mc close to 3.0 with b-value ranging from 0.59 to 1.03. Whilst the Mw 6.2 Bashagard earthquake of May 11, 2013 shows the fastest aftershock decay rate, the Mw 7.3 Sarpol-e Zahab earthquake on November 12, 2017 has a long tail of aftershocks.
کلیدواژه ها
 
Title
Aftershocks of Some Major Earthquakes in the Iranian Plateau
Authors
seyed hasan mousavi-bafrouei, Alireza Babaie Mahani
Abstract
We analyze aftershock sequences following major earthquakes within the Iranian Plateau. Using the dataset prepared by Mousavi-Bafrouei and Babaie Mahani (2020), we obtain seismological parameters for the aftershocks of 12 earthquakes with moment magnitude (Mw) between 6.1 and 7.8 that occurred between 2005 and 2017. For each sequence, we calculate magnitude of completeness (Mc) based on stability of the Gutenberg-Richter b-value followed by calculation of the Omori’s law parameters for decay rate of aftershocks. Most aftershock sequences show similar Mc close to 3.0 with b-value ranging from 0.59 to 1.03. Whilst the Mw 6.2 Bashagard earthquake of May 11, 2013 shows the fastest aftershock decay rate, the Mw 7.3 Sarpol-e Zahab earthquake on November 12, 2017 has a long tail of aftershocks.
Keywords
mainshock, aftershock, Gutenberg-Richter relationship, Omori’s law, b-value, magnitude of completeness