TY - JOUR ID - 96854 TI - Basement Seismicity in the Lurestan Arc of Zagros JO - Scientific Quarterly Journal of Geosciences JA - GSJ LA - en SN - 1023-7429 AU - Jamalreyhani, Mohammadreza AU - Ghods, Abdolreza AU - Mottaghi, Seyyed Khalil AU - Shabanian, Esmail AU - Talebian, Morteza AU - Chen, Beijing AD - MSc. Graduate Student of Geophysics, Institute for Advanced Studies in Basic Sciences, Zanjan, Iran. AD - Associate Professor, Department of Earth Science, Institute for Advanced Studies in Basic Sciences, Zanjan, Iran AD - Assistant Professor, Department of Earth Science, Institute for Advanced Studies in Basic Sciences, Zanjan, Iran AD - Associate Professor, Institute for Earth Science, Geological Survey of Iran, Tehran, Iran AD - Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China Y1 - 2019 PY - 2019 VL - 29 IS - 113 SP - 13 EP - 24 KW - Lurestan arc KW - Zagros KW - Seismicity KW - Basment faulting DO - 10.22071/gsj.2018.116086.1383 N2 - One of the main issues in Zagros is the extent that basement and the thick sedimentary layer participate in the observed seismicity. During Nov. 2013, five magnitude ~5 Mw events hit a region in the western end of Lurestan arc of Simply Folded Belt (SFB) of Zagros. We used the Iran-China temporary network and data from regional permanent networks to relocate the events using a multiple event relocation method, calculate regional moment tensor and centeriod depths for the five moderate events and estimate a velocity model for the two nearby seismic stations using joint inversion of the receiver functions and dispersion curves. Our results show a seismic cluster of about 30 km long and 15 km width. The moment tensor solutions of the five moderate events indicate an almost pure thrust mechanism. The aftershock cloud indicate a low angle east dipping fault plane (i.e., , dip in the range of 23 o -39 o ) as the causative fault plane. The calculated centeroid of the five moderate events are about 14 km and the focal depth of all events calculated by multiple event relocation are about 10-16 km. The results indicate that the thickness of sedimentary column is less than 8 km and thus showing the whole seismic cluster happened within the basement. This observation proves wrong the hypothesis of vertical separation of mainshock and aftershocks in Ssimply folded belt FB of Zagros (Nissen et al. 2011) and implies that in the Lurestan arc the sedimentary layers are deformed aseismically. UR - http://www.gsjournal.ir/article_96854.html L1 - http://www.gsjournal.ir/article_96854_464c5f4e4fe131ffec18e3f63268beb7.pdf ER -