新丰江及龙滩水库地震活动性研究
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摘要
水库诱发地震的地震活动特征与地震定位研究是开展水库地震研究及危险性评估的重要基础。结合新丰江及龙滩水库的蓄水过程研究讨论了新丰江及龙滩水库的地震活动性,利用2009～2010年在新丰江及龙滩库区架设的加密台站以及两水库原有的观测台站组成的观测台阵记录到的连续观测地震波形,通过结合了波形互相关技术的双差定位法做了地震精定位研究。研究结果证明利用波形互相关技术提取的互相关数据改良了地震定位结果,精定位后震中分布更为集中,与库水分布及周围断裂的分布一致,震源深度也有所收敛,希望该方法推广到今后的水库地震研究中去。
Studies on reservoir-induced seismic activity and earthquake location are important foundations for reservoir earthquake research and hazard assessment.In this paper,we discussed seismic activity of Longtan and Xinfengjiang reservoirs,combined with reservoir impoundment process.Using seismic waveforms observed by observation array consisted of intensive observation stations and original observation stations around Longtan and Xinfengjiang reservoirs from 2009 to 2010,we relocated earthquake location by double difference relocation with waveform cross correlation method.Research results show that waveform cross-correlation data by cross correlation method improved earthquake positioning,epicenter distribution was more concentrated and more consistent with reservoir distribution and fracture distribution around reservoirs,focal depth is also somewhat convergent.I hope this method will be applied to studies on reservoir earthquakes in the future.
Studies on reservoir-induced seismic activity and earthquake location are important foundations for reservoir earthquake research and hazard assessment.In this paper,we discussed seismic activity of Longtan and Xinfengjiang reservoirs,combined with reservoir impoundment process.Using seismic waveforms observed by observation array consisted of intensive observation stations and original observation stations around Longtan and Xinfengjiang reservoirs from 2009 to 2010,we relocated earthquake location by double difference relocation with waveform cross correlation method.Research results show that waveform cross-correlation data by cross correlation method improved earthquake positioning,epicenter distribution was more concentrated and more consistent with reservoir distribution and fracture distribution around reservoirs,focal depth is also somewhat convergent.I hope this method will be applied to studies on reservoir earthquakes in the future.
引文
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[9]陈翰林,赵翠萍,修济刚,等.龙滩水库地震精定位及活动特征研究[J].地球物理学报,2009,52(8):2035~2043.
[10]陈翰林,赵翠萍,修济刚,等.龙滩库区地震震源机制解特征研究[J].地震地质,2009,31(4):1~13.
[2]Simpson D W,leith W S,Scholz C H.Two types of reservoir-induced seismicity[J].Bul1.Seism.Soc.Am.,1988,78(6):2025-2040.
[3]Pradeep T.,Acree S.Pore pressure diffusion and the mechanism of reservoir-induced seismicity[J].PureApplication Geophysics,1985,122(6):947-965.
[4]丁原章.中国的水库诱发地震[J].华南地震,1989,9(1):64-72.
[5]丁原章.水库诱发地震[M].北京:地震出版社,1989.
[6]于海英,公茂盛,金波,等.水库地震的地震动特性[J].自然灾害学报,2006,15(5):188-193.
[7]欧作畿.水库诱发地震的研究[J].云南水力发电,2005,21(3):18-21,29.
[8]万永芳,杨马陵.新丰江水库地震序列的分段研究[J].华北地震科学,2011,29(04):27-33.
[9]陈翰林,赵翠萍,修济刚,等.龙滩水库地震精定位及活动特征研究[J].地球物理学报,2009,52(8):2035~2043.
[10]陈翰林,赵翠萍,修济刚,等.龙滩库区地震震源机制解特征研究[J].地震地质,2009,31(4):1~13.
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