- 责任者：Yang Yu (State Key Laboratory of Earthquake Dynamics ; Institute of Geology ; China Earthquake Administration ; Beijing 100029 ; China) ; Yang Xiaosong
- 刊名：Seismology and Geology
- 出版年：2010
- 卷期：32(1)
- 关键词：地壳 ; crust ; 部分熔融 ; partial melting ; 青藏高原 ; Qinghai-Tibetan Plateau
- 页码：p.59-69
- 图表：4 illus., 44 refs.
- 分类号：0400
- issnNo：ISSN0253-4967
- isbnNo：CN11-2192/P
Ultrasonic velocity measurements on the schists, gneisses, migmatites, amphibolites and mylonites from Higher Himalayan Crystallines (HHC) and Honghe strike-slip fault zone in the southwestern China show that the average anisotropic magnitude of them is much less than that observed by a series of measurements of surface-wave dispersion inversions and waveform inversions of P to S conversions in these regions. Modeled results indicate that seismic anisotropy can be enhanced by alignment of melt. Geophysical investigations demonstrate that Tibetan and Sichuan-Yunnan crust is characterized by high geothermal gradients and abnormal thickness. The authors attribute the extremely high anisotropy observed within Tibetan and Sichuan-Yunnan crust to aligned melt pocket induced by localized deformation.