利用“重复地震”估算丽江-宁蒗断裂带的深部滑动速率
摘要
利用云南数字地震台网1999～2006年的波形资料来研究丽江-宁蒗地区的地震活动和滑动速率.双差法重新定位后的地震图像展示了丽江和宁蒗地区的地震活动存在明显差异,在研究时段内76%以上的地震发生在该断裂带南部的丽江地区;震源深度分布与研究区的深部构造较为相符.通过波形互相关分析,识别出92组相似地震对和70组多重相似对,大部分相似地震活动表现为非周期性,重复间隔从数分钟到数百天不等.基于两组"重复地震"估算出深部约23km处的滑动速率约为5mm/a,这一结果和地质资料以及同时期GPS资料结果相符,可能是真实的构造运动反映.
引文
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13林中洋,胡鸿翔,张文彬,等.滇西地区地壳上地幔速度结构特征的研究.地震学报,1993,15(4):427—440
14国家地震局地质研究所,云南地震局.滇西北地区活动断裂.北京:地震出版社,19901
5Huang J L,Zhao D P,Zheng S H.Lithopheric structure and its relationship to seismic and volcanic activity in southwest China.J Geophys Res,2002,107(B10):2255,doi:10.1029/2000JB000137
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17Hanks T C,Kanamori H.A moment magnitude scale.J Geophys Res,1979,84:2348—2350
18Kanamori H,Anderson D L.Theoretical basis for some empirical relations in seismology.Bull Seism Soc Am,1975,65:1073—1095
19Cheng X,Niu F L,Silver P,et al.Similar microearthquakes observed in western Nagano,Japan,and implications for rupture mechan-ics.J Geophys Res,2007,112:1—13,doi:10.1029/2006JB004416
20Rubin A M,Gillard D.Aftershock asymmetry/rupture directivity among central San Andreas fault microearthquakes.J Geophys Res,2000,105:19095—19109,doi:10.1029/2000JB900129
21沈军,汪一鹏,任金卫.中国云南德钦-中甸-大具断裂带第四纪右旋走滑运动.见:青藏高原岩石圈现今变动与动力学(3).北京:地震出版社,2001.123—135
22Shen Z K,LüJ N,Wang M,et al.Contemporary crustal deformation around the southeast borderland of the Tibetan Plateau.J Geo-phys Res,2005,110:B11409,doi:10.1029/2004JB003421
2向宏发,徐锡伟,虢顺民,等.丽江-小金河断裂第四纪以来左旋逆推运动及其地质构造意义.地震地质,2002,24(2):188—198
3张培震,王敏,甘卫军,等.GPS观测的活动断裂滑动速率及其对现今大陆动力作用的制约.地学前缘,2003,10(特刊):81—92
4孙建宝,徐锡伟,石耀霖,等.东昆仑断裂玛尼段震间形变场的INSAR观测及断层滑动率初步估计.自然科学进展,2007,17(10):1361—1370
5Nadeau R M,Foxall W,McEvilly T V.Clustering and periodic recurrence of microearthquakes on the San Andreas fault at Parkfield,California.Science,1995,267:503—507,doi:10.1126/science.267.5197.503
6Nadeau R M,McEvilly T V.Fault slip rates at depth from recurrence intervals of repeating microearthquakes.Science,1999,285:718—721,doi:10.1126/science.285.5428.718
7Schaff D P,Richards P G.Repeating seismic events in China.Science,2004,303:1176—1178,doi:10.1126/science.1093422
8Li L,Chen Q F,Cheng X,et al.Spatial clustering and repeating of seismic events observed along the1976Tangshan fault,north China.Geophys Res Lett,2007,34:L23309,doi:10.1029/2007GL031594
9张培震,邓起东,张国民,等.中国大陆的强震活动与活动地块.中国科学D辑:地球科学,2003,33(增刊):12—20
10Waldhauser F,Ellsworth W L.A double-difference earthquake location algorithm:Method and application to the northern Hayward fault,California.Bull Seismol Soc Am,2000,90:1353—1368,doi:10.1785/0120000006
11杨智娴,于湘伟,郑月军,等.中国中西部地区地震的重新定位和三维地壳速度结构.地震学报,2004,26(1):19—29
12熊绍柏,郑晔,尹周勋,等.丽江-攀枝花-者海地带二维地壳结构及其构造意义.地球物理学报,l993,36(4):434—444
13林中洋,胡鸿翔,张文彬,等.滇西地区地壳上地幔速度结构特征的研究.地震学报,1993,15(4):427—440
14国家地震局地质研究所,云南地震局.滇西北地区活动断裂.北京:地震出版社,19901
5Huang J L,Zhao D P,Zheng S H.Lithopheric structure and its relationship to seismic and volcanic activity in southwest China.J Geophys Res,2002,107(B10):2255,doi:10.1029/2000JB000137
16朱艾斓,徐锡伟,周永胜,等.川西地区小震重新定位及其活动构造意义.地球物理学报,2005,48(3):629—636
17Hanks T C,Kanamori H.A moment magnitude scale.J Geophys Res,1979,84:2348—2350
18Kanamori H,Anderson D L.Theoretical basis for some empirical relations in seismology.Bull Seism Soc Am,1975,65:1073—1095
19Cheng X,Niu F L,Silver P,et al.Similar microearthquakes observed in western Nagano,Japan,and implications for rupture mechan-ics.J Geophys Res,2007,112:1—13,doi:10.1029/2006JB004416
20Rubin A M,Gillard D.Aftershock asymmetry/rupture directivity among central San Andreas fault microearthquakes.J Geophys Res,2000,105:19095—19109,doi:10.1029/2000JB900129
21沈军,汪一鹏,任金卫.中国云南德钦-中甸-大具断裂带第四纪右旋走滑运动.见:青藏高原岩石圈现今变动与动力学(3).北京:地震出版社,2001.123—135
22Shen Z K,LüJ N,Wang M,et al.Contemporary crustal deformation around the southeast borderland of the Tibetan Plateau.J Geo-phys Res,2005,110:B11409,doi:10.1029/2004JB003421
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