IMAGE OF CRUST AND UPPER MANTLE STRUCTURE ALONG THE ARRAY FROM FUYUN TO KUERLE BY P-TO-S CONVERTED WAVES

Abstract

Teleseismic receiver functions, RFs, allow us to image the spatial variation of the converters in crust and upper mantle along the array from Fuyun to Kuerle. Some discontinuous north-dipping mantle converters are seen under Middle Tianshan South-edge Fault. The depths of such converters change gradually from 50 km to 60-70 km. A continuously south-dipping Moho converter expanding to 80-90 km with slight obliquity exists under the North Tianshan North-edge Fault. Relatively strong discontinuous and overlap Moho converters are not only one layer from Middle Tianshan south-edge Fault to Wulumuqi. Strong converte about 50 km depth under Junggar basin is relatively even. Most large depth is near Tianshan Mountains. Large depth and overlap of Moho converters and depth of local earthquakes show structure activity is relatively strong. Depth of Tianshan mountain root is near to 100 km. The south-north extrusion in the region is much more weak than that in west part of Tianshan Mountains.