利用远震接收函数反演乌江彭水电站地震台下方地壳厚度
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摘要
乌江彭水电站目前是重庆市最大的水电站,电站总投资121亿元,总装机容量为175万kW。坝高116.5 m,水库正常蓄水水位293 m,总库容13.35亿m3,为河道型高坝水库。已有研究结果表明,彭水电站坝区是稳定的,但库区及外围地区仍存在5级左右的地震活动背景,在水库蓄水后有可能诱发中、强地震。本文利用彭水台网于2008年11月到2010年12月间记录到的远震数据,通过接收函数的H-Kappa叠加法研究了彭水电站地震台站下方的地壳厚度和泊松比等地壳参数。结果表明该区的地壳厚度在43~46 km之间,泊松比在0.20~0.24之间,这对该区的深部地质构造特征、分析孕震机制等研究具有积极的意义。
With installed capacity of 1.75 million kilowatts and total investment of 23 billion yuan,the Pengshui hydropower station on Wujiang-river is the biggest hydropower station of Chongqing.The dam of the station is about 116.5 meters high,the normal water level is up to 293 meters,and the reservoir capacity is 1.335 billion cubic meters.Researches show that the crust around the dam is stable,but the impoundment of the reservoir may induce moderate and strong earthquake in the potential seismic sources zone.On basis of teleseismic waveform data from 2008 to 2010 recorded by Pengshui Hydropower seismic network,this paper studies the crustal thickness and Passion's ratio of the area using receiver function method.The results show that the crustal thickness range from 43.9 to 47 km and the Poisson's ratio ranges from 0.20 to 0.24.
With installed capacity of 1.75 million kilowatts and total investment of 23 billion yuan,the Pengshui hydropower station on Wujiang-river is the biggest hydropower station of Chongqing.The dam of the station is about 116.5 meters high,the normal water level is up to 293 meters,and the reservoir capacity is 1.335 billion cubic meters.Researches show that the crust around the dam is stable,but the impoundment of the reservoir may induce moderate and strong earthquake in the potential seismic sources zone.On basis of teleseismic waveform data from 2008 to 2010 recorded by Pengshui Hydropower seismic network,this paper studies the crustal thickness and Passion's ratio of the area using receiver function method.The results show that the crustal thickness range from 43.9 to 47 km and the Poisson's ratio ranges from 0.20 to 0.24.
引文
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[11]嵇少丞,王茜,杨文采.华北克拉通泊松比与地壳厚度的关系及其大地构造意义[J].地质学报,2009,83(3):324-330.
[12]Hsiao-Lan Wang and Lupei Zhu,Moho Depth Variationin Tai wan from Teleseismic Receiver Functions[J].Journal of Asian Earth Sci-ences,2009,37(3):286-291.
[13]Langston,C.A.The effect of planar dipping structure on source and receiver responses for constant ray parameter.Bulletin of t he Seis-mological Society of America[J].1977,67(4):1029-1050.
[14]王小龙,倪四道,刘渊源,等.利用远震接收函数分析三峡库区重庆段地壳厚度变化[J].2010.地震地质,2010,32(4):543-551.
[15]胡建平,赵军龙,汪文秉.三峡重庆库区深部二维构造剖面的建立和分析[J].地震研究,2005,28(1):71-77.
[16]Christensen,N.I.and Fountain,D.M.Constitution of thelower continental crust based on experi mental studies of seismic velocitiesingranulite[J].Geological Society of America Bulletin,1975,86(2):227-236.
[17]Fountain,D.M.,and Christensen,N.I.Composition of t hecontinental crust and upper mantle:Areview,in GeophysicalFrameworkof t he Continental United States[C]//The Geological Society of America Memoirs 172.Boulder,Colorado.Edited by L C Pakiser andWD Mooney,1989,172:711-742.
[18]赵瞻,刘波,刘建清,等.重庆彭水地区震旦系灯影组沉积地质新认识[J].沉积与特提斯地质,2010,30(1):32-39.
[19]罗艳,倪四道,曾祥方,等.汶川地震余震区东北端一个余震序列的地震学研究[J].中国科学:地球科学,2010(6):677-687.
[2]吴庆举,曾融生.用宽频带远震接收函数研究青藏高原的地壳结构[J].地球物理学报,1998,41(5):669-679.
[3]Zhu Lupei and Hiroo Kanamori.Moho depth variationin southern California fromteleseismic receiver functions[J].Journal of Geophysi-cal Research,2000,105(B2):2969-2980.
[4]许卫卫,郑天愉.接收函数方法及研究进展[J].地球物理学进展,2002,17(4):605-613.
[5]贺传松,王椿镛,吴庆举.接收函数方法及其新的进展[J].地球物理学进展,2003,18(2):224-228.
[6]张学民,刁桂苓,王为民,等.陕西省数字地震台下方壳幔速度结构研究[J].华北地震科学,2005,23(2):1-9.
[7]李永华,吴庆举,安张辉,等.青藏高原东北缘地壳S波速度结构与泊松比及其意义[J].地球物理学报,2006,49(5):1359-1368.
[8]罗艳,崇加军,倪四道,等.首都圈地区莫霍面起伏及沉积层厚度[J].地球物理学报,2008,51(4):1135-1145.
[9]刘春,崇加军,倪四道,等.利用远震接收函数反演陕西地震台站下方的地壳厚度[J].地震地质,2009,31(2):313-320.
[10]周民都,钱家栋.青藏高原东北缘及其邻区的地壳结构与地震关系初探[J].西北地震学报,1997,19(1):58-63.
[11]嵇少丞,王茜,杨文采.华北克拉通泊松比与地壳厚度的关系及其大地构造意义[J].地质学报,2009,83(3):324-330.
[12]Hsiao-Lan Wang and Lupei Zhu,Moho Depth Variationin Tai wan from Teleseismic Receiver Functions[J].Journal of Asian Earth Sci-ences,2009,37(3):286-291.
[13]Langston,C.A.The effect of planar dipping structure on source and receiver responses for constant ray parameter.Bulletin of t he Seis-mological Society of America[J].1977,67(4):1029-1050.
[14]王小龙,倪四道,刘渊源,等.利用远震接收函数分析三峡库区重庆段地壳厚度变化[J].2010.地震地质,2010,32(4):543-551.
[15]胡建平,赵军龙,汪文秉.三峡重庆库区深部二维构造剖面的建立和分析[J].地震研究,2005,28(1):71-77.
[16]Christensen,N.I.and Fountain,D.M.Constitution of thelower continental crust based on experi mental studies of seismic velocitiesingranulite[J].Geological Society of America Bulletin,1975,86(2):227-236.
[17]Fountain,D.M.,and Christensen,N.I.Composition of t hecontinental crust and upper mantle:Areview,in GeophysicalFrameworkof t he Continental United States[C]//The Geological Society of America Memoirs 172.Boulder,Colorado.Edited by L C Pakiser andWD Mooney,1989,172:711-742.
[18]赵瞻,刘波,刘建清,等.重庆彭水地区震旦系灯影组沉积地质新认识[J].沉积与特提斯地质,2010,30(1):32-39.
[19]罗艳,倪四道,曾祥方,等.汶川地震余震区东北端一个余震序列的地震学研究[J].中国科学:地球科学,2010(6):677-687.
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