Abstract
Regional seismograms were collected to image the lateral variations of Lg coda Q at 1 Hz (Q0) 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 Lg coda Q, at a frequency of 1 Hz, varies between 100 and 500. Lowest Q values ( 250) are found in the eastern Indian block. From the Lg 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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