云南武定M6.5地震动态库仑破裂应力变化的数值模拟及其与余震活动的关系
|
摘要
在离散波数法(DWN)基础上,计算了武定M6.5地震断层破裂在周围介质中产生的位移时程(位移理论地震图)和动态位移场;进行弹性动力学转换后,求得应变时程和动态应变场;最后得到了武定M6.5地震所产生的动态库仑破裂应力变化量和动态库仑破裂应力变化场,进而研究其与后续余震的关系.结果表明,动态应力最大峰值和静态应力的正区均呈非对称性分布,两者的分布特征与余震的分布特征基本一致.在动态应力峰值为正的确定区应力值超过了0.1MPa触发阈值,在静态应力值为正的确定区应力值超过了0.01MPa触发阈值.这说明动态应力和静态应力均有助于余震的发生.
Based on the discrete wavenumber method, this paper calculates time-history of displacement (the theoretical seismogram of displacement) and dynamic displacement field caused by the Wuding M6.5 earthquake. Then the time-history of strain and the dynamic strain field are obtained by elastodynamic transformation. Finally we calculate the dynamic Coulomb rupture stress changes and the dynamic Coulomb rupture stress changes field caused by the Wuding M6.5 earthquake, and then discuss its relationship with the subsequent aftershocks. The results show that the spatial distribution patterns of the positive region of dynamic stress peak value and static stress are both asymmetric, which are basically identical with distribution features of the aftershocks. The dynamic stress peak value and the static stress in the positive region are more than 0.1 MPa and 0.01 MPa of the triggering threshold, respectively, which indicates that the dynamic and static stresses are helpful for the occurrence of aftershocks.
Based on the discrete wavenumber method, this paper calculates time-history of displacement (the theoretical seismogram of displacement) and dynamic displacement field caused by the Wuding M6.5 earthquake. Then the time-history of strain and the dynamic strain field are obtained by elastodynamic transformation. Finally we calculate the dynamic Coulomb rupture stress changes and the dynamic Coulomb rupture stress changes field caused by the Wuding M6.5 earthquake, and then discuss its relationship with the subsequent aftershocks. The results show that the spatial distribution patterns of the positive region of dynamic stress peak value and static stress are both asymmetric, which are basically identical with distribution features of the aftershocks. The dynamic stress peak value and the static stress in the positive region are more than 0.1 MPa and 0.01 MPa of the triggering threshold, respectively, which indicates that the dynamic and static stresses are helpful for the occurrence of aftershocks.
引文
[2]哈佛大学矩张量解来自http:∥www.seismology.harvard.edu/projects/CMT/.
[1]哈佛大学矩张量解来自http:∥www.seismology.harvard.edu/projects/CMT/.
陈培善,秦嘉政.1991.澜沧—耿马地震的破裂过程[J].地震研究,14[2]:95--103.
刁桂苓,张四昌,王绍晋,龙晓帆,王俊国.1999.1995年云南武定6.5级地震震源断层的三维特征[J].地震学报,21[4]:361--366.
郝平,刘杰,韩竹军,傅征祥.2006.印尼MS8.7地震对中国大陆3次后续中强地震的动应力触发研究[J].地震,26[3]:26--36.
胡鸿翔,陆涵行,王椿镛,何正勤,朱良保,颜其中,樊跃新,张国庆,邓英娥.1986.滇西地区地壳结构的爆破地震研究[J].地球物理学报,29[2]:133--144.
胡家富,苏有锦,朱雄关,陈赟.2003.云南的地壳S波速度与泊松比结构及其意义[J].中国科学[D辑],33[8]:714--722.
阚荣举,林中洋.1986.云南地壳上地幔构造的初步研究[J].中国地震,2[4]:51--61.
陆明勇,郑文衡,胡志奇.2006.动态应力作用与地震机制的初步研究[J].地球物理学报,49[1]:170--179.
马淑田,赵薇.1997.1995年10月24日云南武定MS6.5地震的震源机制解[J].地震学报,19[3]:241--245.
秦嘉政,刘祖荫,张俊伟.1997.用地震标定律研究丽江7.0级地震的破裂过程[J].地震研究,20[1]:47--57.
石耀霖.2001.关于应力触发和应力影概念在地震预报中应用的一些思考[J].地震,21[3]:1--7.
宋文,黄毓珍.1997.武定6.5级地震序列震源机制解[J].地震研究,20[3]:265--272.
万永革.2001.“地震静态应力触发”问题的研究[D]:[学位论文].北京:中国地震局地球物理研究所:1--119.
万永革,吴忠良,周公威,黄静.2000.几次复杂地震中不同破裂事件之间的“应力触发”问题[J].地震学报,22[6]:568--576.
万永革,吴忠良,周公威,黄静,秦立新.2002.地震应力触发研究[J].地震学报,24[5]:533--551.
王椿镛,Mooney WD,王溪莉,吴建平,楼海,王飞.2002.川滇地区地壳上地幔三维速度结构研究[J].地震学报,24[1]:1--16.
吴建平,明跃红,王椿镛.2001.云南数字地震台下方的S波速度结构研究[J].地球物理学报,44[2]:228--237.
郑文衡,陆明勇.2005.地震动态触发机制的初步研究[J].地球物理学报,48[1]:116--123.
周真恒,向才英,杨昆杰.2001.云南地区地壳和上地幔的岩石学结构[J].地震地质,23[1]:69--78.
Bouchon M.1981.Asi mple methodto calculate Green′s functionsin elasticlayered media[J].Bull SeismSoc Amer,71:959--971.
Bouchon M.2003.Areviewof the discrete wavenumber method[J].Pure Appl Geophys,160[3]:445--465.
Bouchon M,Aki K.1997.Discrete wavenumber representation of seismic source wave fields[J].Bull Seism Soc Amer,67:259--277.
Cotton F,Coutant O.1997.Dynamic stress variations due to shear faulting in a plane-layered medium[J].Geophys JInt,128:676--688.
Gomberg J,Blanpied ML,Beeler N M.1997.Transient triggering of near and distant earthquakes[J].Bull Seism SocAmer,87:294--309.
Harris R A.1998.Introduction to special section:Stress triggers,stress shadows,and i mplications for seismichazard[J].J Geophys Res,103[B10]:24347--24358.
Hill D P,Reaseberg P A,Michael A,Arabaz WJ,Beroza G,Brumbaugh D,Brune J N,Castro R,Davis S,dePolo D,Ellsworth WL,Gomberg J,Harmsen S,House L,Jackson S M,Johnston MJ S,Jones L,Keller R,Malone S,Munguia L,Nava S,Pechmann J C,Sanford A,Si mpson R W,Smith R B,Stark M,Stickney M,Vidal A,WalterS,Wong V,Zoll weg J.1993.Seismicity remotely triggered by the magnitude7.3Landers,California,earthquake[J].Science,260:1617--1623.
Kilb D,Gomberg J,Bodin P.2000.Triggering of earthquake aftershocks by dynamic stresses[J].Nature,408:570--574.
King G C P,Cocco M.2000.Fault interaction by elastic stress changes:Newclues fromearthquake sequences[J].AdvGeophys,44:1--38.
Mohamad R,Darkal A N,Seber D,Sandvol E,Gomez F,Barazangi M.2000.Remote earthquake triggering along theDead Sea fault in Syria following the1995Gulf of Aqaba earthquake[MS=713][J].Seis Res Lett,71:47--52.
Okada Y.1992.Internal deformation due to shear andtensile faultsin a half-space[J].Bull SeismSoc Amer,82:1018--1040.
Stein R S.1999.Stress transfer in earthquake occurrence[J].Nature,402:605--609.
Ziv A,Rubin A M.2000.Static stress transfer and earthquake triggering:Nolower thresholdin sight?[J].J GeophysRes,105:13631--13642.
[1]哈佛大学矩张量解来自http:∥www.seismology.harvard.edu/projects/CMT/.
陈培善,秦嘉政.1991.澜沧—耿马地震的破裂过程[J].地震研究,14[2]:95--103.
刁桂苓,张四昌,王绍晋,龙晓帆,王俊国.1999.1995年云南武定6.5级地震震源断层的三维特征[J].地震学报,21[4]:361--366.
郝平,刘杰,韩竹军,傅征祥.2006.印尼MS8.7地震对中国大陆3次后续中强地震的动应力触发研究[J].地震,26[3]:26--36.
胡鸿翔,陆涵行,王椿镛,何正勤,朱良保,颜其中,樊跃新,张国庆,邓英娥.1986.滇西地区地壳结构的爆破地震研究[J].地球物理学报,29[2]:133--144.
胡家富,苏有锦,朱雄关,陈赟.2003.云南的地壳S波速度与泊松比结构及其意义[J].中国科学[D辑],33[8]:714--722.
阚荣举,林中洋.1986.云南地壳上地幔构造的初步研究[J].中国地震,2[4]:51--61.
陆明勇,郑文衡,胡志奇.2006.动态应力作用与地震机制的初步研究[J].地球物理学报,49[1]:170--179.
马淑田,赵薇.1997.1995年10月24日云南武定MS6.5地震的震源机制解[J].地震学报,19[3]:241--245.
秦嘉政,刘祖荫,张俊伟.1997.用地震标定律研究丽江7.0级地震的破裂过程[J].地震研究,20[1]:47--57.
石耀霖.2001.关于应力触发和应力影概念在地震预报中应用的一些思考[J].地震,21[3]:1--7.
宋文,黄毓珍.1997.武定6.5级地震序列震源机制解[J].地震研究,20[3]:265--272.
万永革.2001.“地震静态应力触发”问题的研究[D]:[学位论文].北京:中国地震局地球物理研究所:1--119.
万永革,吴忠良,周公威,黄静.2000.几次复杂地震中不同破裂事件之间的“应力触发”问题[J].地震学报,22[6]:568--576.
万永革,吴忠良,周公威,黄静,秦立新.2002.地震应力触发研究[J].地震学报,24[5]:533--551.
王椿镛,Mooney WD,王溪莉,吴建平,楼海,王飞.2002.川滇地区地壳上地幔三维速度结构研究[J].地震学报,24[1]:1--16.
吴建平,明跃红,王椿镛.2001.云南数字地震台下方的S波速度结构研究[J].地球物理学报,44[2]:228--237.
郑文衡,陆明勇.2005.地震动态触发机制的初步研究[J].地球物理学报,48[1]:116--123.
周真恒,向才英,杨昆杰.2001.云南地区地壳和上地幔的岩石学结构[J].地震地质,23[1]:69--78.
Bouchon M.1981.Asi mple methodto calculate Green′s functionsin elasticlayered media[J].Bull SeismSoc Amer,71:959--971.
Bouchon M.2003.Areviewof the discrete wavenumber method[J].Pure Appl Geophys,160[3]:445--465.
Bouchon M,Aki K.1997.Discrete wavenumber representation of seismic source wave fields[J].Bull Seism Soc Amer,67:259--277.
Cotton F,Coutant O.1997.Dynamic stress variations due to shear faulting in a plane-layered medium[J].Geophys JInt,128:676--688.
Gomberg J,Blanpied ML,Beeler N M.1997.Transient triggering of near and distant earthquakes[J].Bull Seism SocAmer,87:294--309.
Harris R A.1998.Introduction to special section:Stress triggers,stress shadows,and i mplications for seismichazard[J].J Geophys Res,103[B10]:24347--24358.
Hill D P,Reaseberg P A,Michael A,Arabaz WJ,Beroza G,Brumbaugh D,Brune J N,Castro R,Davis S,dePolo D,Ellsworth WL,Gomberg J,Harmsen S,House L,Jackson S M,Johnston MJ S,Jones L,Keller R,Malone S,Munguia L,Nava S,Pechmann J C,Sanford A,Si mpson R W,Smith R B,Stark M,Stickney M,Vidal A,WalterS,Wong V,Zoll weg J.1993.Seismicity remotely triggered by the magnitude7.3Landers,California,earthquake[J].Science,260:1617--1623.
Kilb D,Gomberg J,Bodin P.2000.Triggering of earthquake aftershocks by dynamic stresses[J].Nature,408:570--574.
King G C P,Cocco M.2000.Fault interaction by elastic stress changes:Newclues fromearthquake sequences[J].AdvGeophys,44:1--38.
Mohamad R,Darkal A N,Seber D,Sandvol E,Gomez F,Barazangi M.2000.Remote earthquake triggering along theDead Sea fault in Syria following the1995Gulf of Aqaba earthquake[MS=713][J].Seis Res Lett,71:47--52.
Okada Y.1992.Internal deformation due to shear andtensile faultsin a half-space[J].Bull SeismSoc Amer,82:1018--1040.
Stein R S.1999.Stress transfer in earthquake occurrence[J].Nature,402:605--609.
Ziv A,Rubin A M.2000.Static stress transfer and earthquake triggering:Nolower thresholdin sight?[J].J GeophysRes,105:13631--13642.
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