The Indo–Eurasia convergent margin and earthquakes in and around Tibetan Plateau
The Indo–Eurasia convergent margin and earthquakes in and around Tibetan Plateau
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DOI：
10.2465/jmps.190927
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发表时间：
2020
影响因子：
0.7
通讯作者：
Yanbin Wang;Yangfan Deng;F. Shi;Zhigang Peng
中科院分区：
文献类型：
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作者：
Yanbin Wang;Yangfan Deng;F. Shi;Zhigang Peng
在简要回顾了喜马拉雅山和青藏高原的构造背景后，我们对青藏高原及周边地区地震特征的文献进行了调查。浅层事件（震源深度<50公里）在空间位置和震源机制方面与地表断层系统表现出显着的相关性。一些浅层事件似乎是由远程地震和地下水储存的季节性变化引发的，表明应力水平接近临界阈值。中深度地震（IDEQ，即震源深度在50至300公里之间的地震）集中在西藏南部、兴都库什-帕米尔地区和缅甸俯冲带以下。在西藏南部下方，俯冲的印度板块向北至少延伸到班公-怒江缝合带，IDEQ发生在下地壳和邻近的上地幔中。还审查了 IDEQ 的可能机制。
After a brief review on tectonic settings of the Himalayas and Tibetan Plateau, we survey the literature on characteristics of earthquakes occurring in Tibetan Plateau and the surrounding regions. Shallow events (focal depths <50 km) show remarkable correlation with surface fault systems in both spatial locations and focal mechanisms. Some shallow events appear to be triggered by remote earthquakes and seasonal variations of ground water storage, suggesting stress levels nearing critical threshold. Intermediate – depth earthquakes (IDEQs; i.e., earthquakes with focal depths between 50 and 300 km) are concentrated beneath southern Tibet, the Hindu Kush – Pamir region, and the Burmese subductions zones. Underneath southern Tibet, the subducted Indian plate extends northward to at least the Bangong – Nujiang suture zone, with IDEQs occurring in the lower crust and the adjacent upper mantle. Possible mechanisms for IDEQs are also reviewed.