ACRUSTAL SCALE IMAGING ACROSS THE ARABIA-EURASIA COLLISION ZONE

Publish Year: 1398
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:

SEE08_306

تاریخ نمایه سازی: 23 آبان 1399

Abstract:

Continental collision along the Zagros suture occurred due to convergence of the Arabian plate and the Eurasia (Figure 1) initiated at ∼35 Ma (e.g., Mouthereau et al., 2012, and references therein) with the main phase at ~27 Ma (e.g., Madanipour et al., 2013; Egan et al., 2009). Here, we study the crustal structure by focusing on both the geometry and the changes in anisotropic properties of the crust across the China-Iran profile In this work, our main objective is to recognize dipping interfaces and/or anisotropic layers (subsurface structures) at crustal depth. With that aim, we implement the harmonic decomposition method is based on the derivation of the back azimuthal harmonics of a Preceiver function data set as a function of the incoming P- wavefield direction (Girardin and Farra, 1998; Farra and Vinnik, 2000). The preference of this technique over classical RF analysis is making interpretation easier, by separating the constant azimuth term from the azimuth dependence term (3-D features). The harmonic analysis separates the contributions of the isotropic part of the structure below the seismic station and puts it in the k=0; and also the harmonics analysis separates the contribution of 3D structures (i.e. anisotropy with plunging symmetry axis and dipping interfaces) and puts them on the first-order (k = 1) components, these two actually generating a two-lobed variation (360°) with back-azimuth; the second components of the harmonics (k = 2) shows an anisotropy with horizontal axis, as regards a four-lobed variation (180°) is associated with the presence of anisotropy with a symmetry axis in the horizontal direction (Bianchi et al., 2008, 2010). We used data from CIGSIP (China-Iran Geological Geophysical Survey in the Iranian Plateau) temporary linear array of broadband seismic stations installed in NW Iran (Figure 1).

Authors

Farzaneh DASHTI

Ph.D. Student, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran

Francesco PIO LUCENTE

Senior Researcher, Centro Nazionale Terremoti, Rome, Italy

Khalil MOTAGHI

Assistant Professor, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran

Irene BIANCHI

Assistant Professor, Institut für Meteorologie und Geophysik, Universität Wien, Vienna, Austria