雅砻江流域下游梯级水库地震台网监测能力验证

Seismic Network Monitoring Capability of the Cascade Reservoir Stations at Yalongjiang River Basin Downstream

雅砻江流域是中国第三大水电基地,位于强震区,水库地震监测工作十分重要。基于近震震级公式和古登堡-里克特震级频度关系式,分别求取雅砻江下游梯级电站水库诱发地震监测台网的理论监测能力和根据实际记录地震进行监测能力验证。结果表明:在重点监视区理论监测能力达到了ML0.5级的要求,实际观测验证表明,重点监视区其实际最小完整性震级为ML0.5级,达到了雅砻江流域下游梯级水库诱发地震监测台网设计目标。

It is very important to monitor reservoir induced earthquake for the cascade hydropower stations at the Yalongjiang river basin, which is the third largest hydropower zone of China, and locates in meizoseismal area. Based on the local earthquake magnitude formula and Gutenberg Richter magnitude frequency relationship equation, the paper calculates the theoretical monitoring capability of the reservoir induced earthquake monitoring system and validates the actual monitoring capability by the earthquake records. The results show that the theoretical monitoring capability is in compliance with the ML 0.5 requirements in the key monitoring areas; the practical minimum complete magnitudes is ML 0.5, which is validated by the actual records. The system fulfils the design objectives of the reservoir induced earthquake monitoring system for the cascade hydropower stations at the Yalongjiang fiver basin.