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Coda Q Variation across the Myanmar Arc and its Neighboring Regions |
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| Authors: | Guangquan Li Jiafu Hu Haiyan Yang Hong Zhao Lianli Cong |
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| Institution: | 1. Department of Geophysics, Yunnan University, 2 North Cuihu Road, Kunming, Yunnan, 650091, P. R. China
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| Abstract: | Regional seismograms were collected to image the lateral variations of L g coda Q at 1 Hz (Q 0 ) and its frequency dependence η across Burma and its neighboring regions. The data include 660 vertical-component traces recorded at 39 stations. The resulting image indicates that L g coda Q, at a frequency of 1 Hz, varies between 100 and 500. Lowest Q values (< 200) lie in the Three rivers (the Jinshajiang River, Nujiang River, and Lancangjiang River) area of Southwest China. Relatively low Q values (200–250) are found in the Himalayan region and the eastern Burma highland. Higher L g coda Q values (> 250) are found in the eastern Indian block. From the L g coda Q tomography, we found that (1) The Sagain fault acts as a rough boundary between the eastern Indian plate and the Three rivers area of the Eurasia plate; (2) near the eastern Himalayan syntaxis, higher Q value appears in the background of relatively low Q (which may be the consequence of the northward intrusion of the Assam block of the Indian plate into the southern Qinghai-Tibet plateau. |
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