Tethyan subducted slab and seismic anisotropy in the upper mantle beneath the north Zagros collision using S teleseismic tomography
عنوان دوره: هجدهمین کنفرانس ژئوفیزیک ایران
نویسندگان
1زنجان - بلوار گاوازنگ - دانشگاه تحصیلات تکمیلی علوم پایه زنجان - دانشکده علوم زمین -دانشجوی دکتری
2هیئت علمی
3موسسه زمین‌شناسی و زئوفیزیک، آکادمی علوم چین
4دانشیار
چکیده
First, primary results in the inversion of teleseismic S-waves traveltime residuals along a dense 520-km long temporary dense seismic profile across the north Zagros and west Alborz mountains to investigate its upper mantle structure were presented. Existence of two realative high velocity one under Zagros Iran beneath Zagros to 70 km over MRF suture zone up to depth of 200 km and second in depth of 400-600 km beneath central Iran using of ? S-waves show a probable rest of remnant of subducted Arabian plate under central Iran that maybe rest in transition zone.
Second, computing of anisotropy from inversion of data from difference between relative residuals of S_Radial and S-Transverse for common events and seismic stations was done. So that Presence of higher velocity beneath Zagros up to depth of 200 km from 200 km before MRF and 50 km after it shows lithospheric anisotropy with fast axes parallel to Zagros orogeny belt in Zagros and on the contrary presence of a large volume beneath central Iran up to 300 km show asthenospheric anisotropy with fast axes perpendicular to Zagros orogeny belt.
کلیدواژه ها
 
Title
Tethyan subducted slab and seismic anisotropy in the upper mantle beneath the north Zagros collision using S teleseismic tomography
Authors
Mohsen Rahmani, Abdolreza Ghods, Ling Chen, Wu Yasheng
Abstract
seismic profile across the north Zagros and west Alborz mountains to investigate its upper mantle structure were presented. Existence of two realative high velocity one under Zagros Iran beneath Zagros to 70 km over MRF suture zone up to depth of 200 km and second in depth of 400-600 km beneath central Iran using of ? S-waves show a probable rest of remnant of subducted Arabian plate under central Iran that maybe rest in transition zone.
Second, computing of anisotropy from inversion of data from difference between relative residuals of S_Radial and S-Transverse for common events and seismic stations was done. So that Presence of higher velocity beneath Zagros up to depth of 200 km from 200 km before MRF and 50 km after it shows lithospheric anisotropy with fast axes parallel to Zagros orogeny belt in Zagros and on the contrary presence of a large volume beneath central Iran up to 300 km show asthenospheric anisotropy with fast axes perpendicular to Zagros orogeny belt.
Keywords
Anisotropy, Teleseismic, travel time, relative residual, transition zone