汶川中强余震震源深度的确定及其意义
|
摘要
首次尝试用滑动时窗相关法识别sPn震相,并通过sPn与Pn震相之间的到时差约束区域地震事件的震源深度.利用陕西、青海、甘肃、云南和四川等区域地震台网记录,给出了汶川MS8.0级地震后,17个中强(MS≥5.0)余震的震源深度.研究结果显示,震源深度主要分布在8~20km深,且以32.5°N为界,由南到北,平均分布在两个不同的深度,分别为11和17km,表明这些余震的震源位于中上地壳.结合其他研究结果,我们认为龙门山断裂可能没有穿透整个地壳,且平武-青川断裂可能不是龙门山断裂的北向延伸.
引文
1陈学波,吴跃强,杜平山,等.龙门山构造带两侧地壳速度结构特征.见:国家地震局科技检测司.中国大陆深度构造的研究与进展.北京:地质出版社,1988.97—113
2崔作舟,陈纪平,吴苓.花石峡-邵阳深部地壳的结构与构造.北京:地质出版社,1996.159—166
3Chen W P,Nabelek J L,Molnar P,et al.An intermediate depth earthquake beneath Tibet:source characteristics of the event of Sep-tember14,1976.J Geophys Res,1981,86:2863—2876
4高原,周慧兰,郑斯华,等.测定震源深度的意义的初步讨论.中国地震,1997,13(4):321—329
5张国明,汪素云,李丽,等.中国大陆地震震源深度及其构造含义.科学通报,2002,47(9):663—668
6郑斯华.青藏高原地震的震源深度及其构造意义.中国地震,1995,11(2):99—106
7Ma S T,Atkinson G M.Focal depths for small to moderate earthquakes(mN≥2.8)in western Quebec,Southern Ontario,and North-ern New York.Bull Seismol Soc Amer,2006,96(2):609-623,doi:10.1785/0120040192
8Saikia C K,Woods B B,Thio H K.Calibration of the regional crustal waveguide and the retrieval of source parameters using wave-form modeling.Pure Appl Geophys,2001,158:1301—1338
9Zhao L S,Helmberger D V.Geophsical implications form relocations of Tibetan earthquake:hot lithosphere.Geophys Res Lett,1991,18(12):2205—2208
10Engdahl E R,Van Der Hilst R,Buland R.Global teleseismic earthquake relocation with improved travel time and procedure for depth determination.Bull Seismol Soc Amer,1998,88:722—743
11Saikia C K.A method for path calibration using regional and teleseismic broadband seismograms:application to the21May1997Ja-balpur,India earthquakes(MW5.8).Seismology,2000,(Special section):1301—1315
12Walter W R.Source parameters of the June29little Skull mountaion earthquake from complete regional waveforms at a single station.Geophys Res Lett,1993,20:403—406
13Zhao L S,Helmberger D V.Source estimate from broadband regional seismograms.Bull Seismol Soc Amer,1994,84:91—104
14Zhu L P,Helmberger D V.Advancement in source estimation technique using broadband regional seismograms.Bull Seismol Soc Amer,1996,86(5):1634—1641
15R Kind.Observation of sPn from Swabian Alb earthquake at the GRF array.J Geophys,1979,45:337—340
16Lanston C A.The SsPmp phase in regional wave propagation.Bull Seismol Soc Amer,1996,86:133—143
17Zhu L,Helmberger D V.Regional waveform calibration in the Pamir-Hindu Kush region.J Geophys Res,1997,102:22799—22813
18房明山,杜安陆,董孝平,等.用sPn震相测定近震源深度.地震地磁观测与研究,1995,16(5):13—18
19任克新,邹立晔,刘瑞丰,等.用sPn计算内蒙地震的震源深度.地震地磁观测与研究,2004,25(3):24—31
20洪星,叶雯燕,邵平荣,等.台湾海峡南部一次5.0级地震的sPn震相分析.地震地磁观测与研究,2006,27(1):26—31
21Mandal P,Chadha R K,Kumar N,et al.Source parameters of the Deadly MW7.6Kashmir Earthquake of8October,2005.Pure Appl Geophys,2007,164,doi:10.1007/s00024-007-0258-8
22Langston C A.Depth of faulting during the1968Mechering,Australia earthquake sequence determined from waveform analysis of local seismograms.J Geophys Res,1987,92:11561—11574
23Laurent S,Davidowitz H.Encoding of olfactory information with oscillating neural assemblies.Science,1994,265:1872—1875
24Laurent S,Wehr M,Davidowitz H.Temporal representations of odors in an olfactory network.J Neurosci,1996,16(12):3837—3847
25赵珠,陈农.龙门山断裂带四川北段震源位置的精确修订.四川地震,1995,4:19—30
26马宗晋,张家声,刘国栋,等.大陆多震层研究现状和讨论.地震地质,12(3):262—264
27丁志锋,曾融生.京津唐地区震源深度分布初探.地震学报,1990,12(3):242—247
28王椿镛,Mooney W D,王溪莉,等.川滇地区地壳上地幔三维速度结构研究.地震学报,2002,24(1):1—16
2崔作舟,陈纪平,吴苓.花石峡-邵阳深部地壳的结构与构造.北京:地质出版社,1996.159—166
3Chen W P,Nabelek J L,Molnar P,et al.An intermediate depth earthquake beneath Tibet:source characteristics of the event of Sep-tember14,1976.J Geophys Res,1981,86:2863—2876
4高原,周慧兰,郑斯华,等.测定震源深度的意义的初步讨论.中国地震,1997,13(4):321—329
5张国明,汪素云,李丽,等.中国大陆地震震源深度及其构造含义.科学通报,2002,47(9):663—668
6郑斯华.青藏高原地震的震源深度及其构造意义.中国地震,1995,11(2):99—106
7Ma S T,Atkinson G M.Focal depths for small to moderate earthquakes(mN≥2.8)in western Quebec,Southern Ontario,and North-ern New York.Bull Seismol Soc Amer,2006,96(2):609-623,doi:10.1785/0120040192
8Saikia C K,Woods B B,Thio H K.Calibration of the regional crustal waveguide and the retrieval of source parameters using wave-form modeling.Pure Appl Geophys,2001,158:1301—1338
9Zhao L S,Helmberger D V.Geophsical implications form relocations of Tibetan earthquake:hot lithosphere.Geophys Res Lett,1991,18(12):2205—2208
10Engdahl E R,Van Der Hilst R,Buland R.Global teleseismic earthquake relocation with improved travel time and procedure for depth determination.Bull Seismol Soc Amer,1998,88:722—743
11Saikia C K.A method for path calibration using regional and teleseismic broadband seismograms:application to the21May1997Ja-balpur,India earthquakes(MW5.8).Seismology,2000,(Special section):1301—1315
12Walter W R.Source parameters of the June29little Skull mountaion earthquake from complete regional waveforms at a single station.Geophys Res Lett,1993,20:403—406
13Zhao L S,Helmberger D V.Source estimate from broadband regional seismograms.Bull Seismol Soc Amer,1994,84:91—104
14Zhu L P,Helmberger D V.Advancement in source estimation technique using broadband regional seismograms.Bull Seismol Soc Amer,1996,86(5):1634—1641
15R Kind.Observation of sPn from Swabian Alb earthquake at the GRF array.J Geophys,1979,45:337—340
16Lanston C A.The SsPmp phase in regional wave propagation.Bull Seismol Soc Amer,1996,86:133—143
17Zhu L,Helmberger D V.Regional waveform calibration in the Pamir-Hindu Kush region.J Geophys Res,1997,102:22799—22813
18房明山,杜安陆,董孝平,等.用sPn震相测定近震源深度.地震地磁观测与研究,1995,16(5):13—18
19任克新,邹立晔,刘瑞丰,等.用sPn计算内蒙地震的震源深度.地震地磁观测与研究,2004,25(3):24—31
20洪星,叶雯燕,邵平荣,等.台湾海峡南部一次5.0级地震的sPn震相分析.地震地磁观测与研究,2006,27(1):26—31
21Mandal P,Chadha R K,Kumar N,et al.Source parameters of the Deadly MW7.6Kashmir Earthquake of8October,2005.Pure Appl Geophys,2007,164,doi:10.1007/s00024-007-0258-8
22Langston C A.Depth of faulting during the1968Mechering,Australia earthquake sequence determined from waveform analysis of local seismograms.J Geophys Res,1987,92:11561—11574
23Laurent S,Davidowitz H.Encoding of olfactory information with oscillating neural assemblies.Science,1994,265:1872—1875
24Laurent S,Wehr M,Davidowitz H.Temporal representations of odors in an olfactory network.J Neurosci,1996,16(12):3837—3847
25赵珠,陈农.龙门山断裂带四川北段震源位置的精确修订.四川地震,1995,4:19—30
26马宗晋,张家声,刘国栋,等.大陆多震层研究现状和讨论.地震地质,12(3):262—264
27丁志锋,曾融生.京津唐地区震源深度分布初探.地震学报,1990,12(3):242—247
28王椿镛,Mooney W D,王溪莉,等.川滇地区地壳上地幔三维速度结构研究.地震学报,2002,24(1):1—16
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心