ZHENG Chen,
DING Zhi-Feng,
SONG Xiao-Dong
.2016.Joint inversion of surface wave dispersion and receiver functions for crustal and uppermost mantle structure in Southeast Tibetan Plateau.Chinese Journal Of Geophysics,59(9): 3223-3236,doi: 10.6038/cjg20160908
利用面波频散与接收函数联合反演青藏高原东南缘地壳上地幔速度结构
郑晨1,2, 丁志峰1,3, 宋晓东2,4
1. 中国地震局地球物理研究所, 北京 100081; 2. Department of Geology, University of Illinois at Urbana-Champaign, IL 61820, USA; 3. 中国地震局地震观测与地球物理成像重点实验室, 北京 100081; 4. 武汉大学测绘学院, 武汉 430079
Joint inversion of surface wave dispersion and receiver functions for crustal and uppermost mantle structure in Southeast Tibetan Plateau
ZHENG Chen1,2, DING Zhi-Feng1,3, SONG Xiao-Dong2,4
1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China; 2. Department of Geology, University of Illinois at Urbana-Champaign, IL 61820, USA; 3. Key Laboratory of Seismic Observation and Geophysical Imaging, China Earthquake Administration, Beijing 100081, China; 4. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
Abstract：The Southeast Tibetan is of great scientific value to the problems about the uplift, crustal thickening and escape of the Tibetan Plateau. Through the analysis of observational data recorded by the temporary seismic stations deployed in the study area, crustal thickness, sediment thickness and a high-resolution S wave velocity model of the crustal and upper mantle have been derived. The results demonstrate:(1) Regional crustal thickness varies strongly, the crustal thickness becomes thinner gradually from northwest to southeast. (2) The sediment thickness is consistent with the distribution of sedimentary basins in the research area. (3) There are two main NS-trending low-velocity zones (LVZs) observed in the mid-lower crust. One of the LVZs starts from Chuanxibei sub-block and goes across the Lijiang fault into Dianzhong sub-block. The other one follows the trace of the Xiaojiang fault until about 24°N. These two LVZs are separated by the high velocity anomaly under Sichuan Basin and the inner zone of Emeishan Large Igneous Province in the middle crust.
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