Strong Lg-wave attenuation in the Middle East continental collision orogenic belt
Strong Lg-wave attenuation in the Middle East continental collision orogenic belt
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中东大陆碰撞造山带Lg波强衰减
DOI：
10.1016/j.tecto.2016.02.025
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发表时间：
2016-04
期刊：
影响因子：
2.9
通讯作者：
Xie Xiao-Bi
中科院分区：
文献类型：
--
作者：
Zhao Lian-Feng;Xie Xiao-Bi
Using Lg-wave Q tomography, we construct a broadband crustal attenuation model for the Middle East. The QLgimages reveal a relationship between attenuation and geological structures. Strong attenuation is found in the continental collision orogenic belt that extends from the Turkish and Iranian plateau to the Pamir plateau. We investigate the frequency dependence of QLgin different geologic formations. The results illustrate that QLgvalues generally increase with increasing frequency but exhibit complex relationships both with frequency and between regions. An average QLgvalue between 0.2 and 2.0 Hz, QLg(0.2–2.0 Hz), may be a critical index for crustal attenuation and is used to infer the regional geology. Low-QLganomalies are present in the eastern Turkish plateau and correlate well with low Pn-velocities and Cenozoic volcanic activity, thus indicating possible partial melting within the crust in this region. Very strong attenuation is also observed in central Iran, the Afghanistan block, and the southern Caspian Sea. This in line with the previously observed high crustal temperature, high-conductivity layers, and thick marine sediments in these areas, suggests the high Lg attenuation is caused by abnormally high tectonic and thermal activities.
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