- 责任者：Ma Wentao (National Geophysical Field Observatory ; Institute of Geology ; China Earthquake Administration ; Beijing 100029 ; China) ; Lin Yong
- 刊名：Seismology and Geology
- 出版年：2013
- 卷期：35(4)
- 关键词：水库地震 ; reservoir earthquake
- 页码：p.914-929
- 图表：13 illus., 53 refs.
- 分类号：0500
- issnNo：ISSN0253-4967
- isbnNo：CN11-2192/P
Based on the differences of seismic activity,focal mechanism,geological structure,and hydrologic condition between reservoir induced seismicity （RIS） to natural earthquake,the basic features of reservoir induced earthquake from natural earthquake are studied statistically by the RIS database of 150 cases of reservoir induced earthquakes world-wide,and the results are shown as follows：① Using statistical principle,we find that RIS occur in the areas near the reservoir banks in the impounding period,most of reservoir induced earthquake are distributed within a distance of 10km to the bank,with depth less than 10km,and a few events extend outwards as far as over 10km along fault zones,karst caves,and（thermal） springs; ②The frequency and magnitude of reservoir induced seismicity change with the reservoir water level.Most maximum magnitude earthquakes take place in the period before the first highest water level is reached,or in the following 2-3 impounding stages after the first highest water level,after then,a few would take place; ③The sequence of RIS is complete,usually as ＂foreshock-main shock-aftershock＂ or ＂ foreshock-swarm-aftershock＂,most of them are microseisms of ML1-3,so the b value is larger than natural earthquakes; ④ RIS differ from natural shocks in higher epicenter intensity,higher frequency of ground motion and higher peak ground acceleration,but faster attenuation with distance; ⑤The stress drop of RIS is smaller than that of natural earthquake of the same size,and the source size is larger; ⑥ The RIS occur in areas under lithological and geologic conditions of good permeability.Tensional fracture,tensional fault zone,unconsolidated fault plane,karst,and（thermal）springs are all good water penetration channels.