P-wave attenuation variations beneath the central and western Tien Shan from teleseismic waves

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Xiaolong Ma , Zongying Huang
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引用次数: 0

Abstract

The seismic attenuation plays an important role in understanding the subsurface structure and provides complementary information on the mantle dynamic together with seismic velocity information. Here we explore the attenuation structure beneath the central and western Tien Shan using teleseismic P-wave data. Firstly, we map the spatial distribution of relative attenuation parameter using the spectral ratio technique in the frequency band between 0.1 and 1.5 Hz. Our results reveal strong lateral attenuation variations in the lithosphere and asthenosphere underneath the study area. Then we invert for the Qp values using a linear inversion approach. Two high-attenuation regions are observed beneath the middle Tien Shan and western Tarim Basin that could be associated with upwelling hot materials and/or a small plume. Moreover, low-attenuation regions are found beneath the Kazakh Shield and western Tien Shan, which can be attributed to the underthrusted/subducted lithospheric fragments.
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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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