A new approach to obtaining a 3D shear wave velocity model of the crust and upper mantle: An application to eastern Turkey

被引:31
|
作者
Delph, Jonathan R. [1 ]
Zandt, George [1 ]
Beck, Susan L. [1 ]
机构
[1] Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA
基金
美国国家科学基金会;
关键词
Continental lithosphere; Seismic imaging techniques; Eastern Mediterranean; Neotectonics; CONTINENT-CONTINENT COLLISION; ANATOLIAN PLATEAU TURKEY; RECEIVER FUNCTIONS; JOINT INVERSION; DISCONTINUITY STRUCTURE; LITHOSPHERIC STRUCTURE; SURROUNDING REGIONS; STRUCTURE BENEATH; IRANIAN PLATEAU; WESTERN US;
D O I
10.1016/j.tecto.2015.09.031
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
We present a new approach to the joint inversion of surface wave dispersion data and receiver functions by utilizing Common Conversion Point (CCP) stacking to reconcile the different sampling domains of the two datasets. Utilizing CC stacking allows us to suppress noise in the data by waveform stacking, and correct for backazimuthal variations and complex crustal structure by mapping receiver functions back to their theoretical location. When applied to eastern Turkey, this approach leads to a higher resolution image of the subsurface and clearly delineates different tectonic features in eastern Turkey that were not apparent using other approaches. We observe that the slow seismic velocities near the Karliova Triple junction correlate to moderate strain rates and high heat flow, which leads to a rheologically weak crust that has allowed for the upward propagation of Miocene and younger volcanics near the triple junction. We find seismically fast, presumably rigid blocks located in the southeastern Anatolian Plate and Arabian Plate are separated by a band of low shear wave velocities that correspond to the East Anatolian Fault Zone, which is consistent with the presence of fluids in the fault zone. We observe that the Arabian Plate has underthrust the Eurasian Plate as far as the northern boundary of the Bitlis Massif, which can explain the high exhumation rates in the Bitlis Massif as a result of slab break-off of the Arabian oceanic lithosphere. We also find a shallow (similar to 33 km) anomaly beneath eastern Turkey that we interpret as a localized wedge of mantle that was underthrust by a crustal fragment during the collision of Arabia and Eurasia. These observations are possible because of the high-resolution images obtained by combining common conversion point receiver function stacks with ambient noise dispersion data to create a data-driven three-dimensional shear wave velocity model. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:92 / 100
页数:9
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