尼泊尔M_W8.1地震对我国大陆井水位动态的影响及其地震预测意义

分析了尼泊尔M_W8.1地震引起的中国大陆井水位同震响应变化特征,并利用同震水位阶变量反演中国大陆震时应力调整状态。结果显示,尼泊尔M_W8.1地震引起中国大陆井水位的同震响应主要表现为振荡型与阶变型变化。从震时应力调整状态来看,中国大陆受此次地震影响较为明显的区域主要是南北地震带,特别是甘青交界、云南地区及川渝黔交界等应力增强明显。从震例分析来看,在尼泊尔M_W8.1地震发生后的2a内,中国大陆有4次地震发生在甘青交界与云南地区,这表明水位同震效应阶变反演的震时应力增强区域,可能对未来地震危险区具有一定的指示意义。

Impact of the MW8.1 Nepal Earthquake on Well Water Level in Mainland China and Its Implications on Earthquake Prediction

Characteristics of water level co-seismic responses and post seismic effects induced by the M_W8.1 Nepal earthquake are analyzed, and the adjustment state of stress is calculated using co-seismic water level changes. The results show that the main types of co-seismic response and post seismic effects are oscillation and rise, respectively. The north-south seismic belt is the main area, with more adjustment induced by the M_W8.1 Nepal earthquake, related to the co-seismic adjustment of stress. The stresses on the border of Gausu province and Qinghai province, Yunnan, and the borders of Sichuan, Chongqing and Guizhou enhanced obviously. In 2 years after M_W8.1 Nepal earthquakes, four earthquakes occurred in the border of Gausu and Qinghai provinces, and in Yunnan. This indicates that the area of the co-seismic enhancement of stress inverted by co-seismic water level might have certain indicative significance to future earthquakes.