从多地震活动参数角度定量分析芦山地震的背景活动性
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
2013年4月20日龙门山断裂带南段发生Ms7.0级芦山地震,通过计算多个地震活动参数,定量分析芦山地震发生的背景地震活动性及与汶川地震的关联性.结果表明:1)历史记载龙门山断裂南段仅有3次6.0级以上强震,存在地震空区的历史地震背景;2)通过a值分析可知,芦山地震发生前30年背景地震活动性较高;3)分析汶川地震前后b值的空间分布差异,发现龙门山断裂南段在汶川地震后仅部分区域b值下降,应力增强,芦山地震发生在b值明显下降区.
The Ms7. 0 Lushan earthquake occurred in the southern part of Longmenshan fault on 20 April 2013. We calculate several kinds of seismic activity parameters to analyze the background activity of Lushan earthquake and relate them with Wenchuan earthquake. The results show that 1)there were only three great earthquakes above M6. 0 occurring in the southern part of Longmenshan fault,which indicates existence of earthquake gap in historic earthquake background; 2) based on the values of a,the background earthquake activity was high during the 30 years before Lushan earthquake; and 3) the spatial difference in b-value before and after Wenchuan earthquake shows decrease of b-value and increase of stress only in part of southern Longmenshan fault zone while Lushan earthquake occurred in the region where b-value decreased apparently.
引文
[1]陈运泰,杨智娴,张勇,等.从汶川地震到芦山地震[J].中国科学:地球科学,2013,43(6):1 064-1 072.
    [2]刘杰,易桂喜,张致伟,等.2013年4月20日四川芦山M7.0级地震介绍[J].地球物理学报,2013,56(4):1 404-1 407.
    [3]杜方,龙锋,阮祥,等.四川芦山7.0级地震及其与汶川8.0级地震的关系[J].地球物理学报,2013,56(5):1 772-1 783.
    [4]Parsons T,Ji C,Kirby E.Stress changes from the 2008Wenchuan earthquake and increased hazard in the Sichuan basin[J].Nature,2008,454(7023):509-510.
    [5]Toda S,Lin J,Meghraoui M,et al.12 May 2008 M=7.9Wenchuan,China,earthquake calculated to increase failure stress and seismicity rate on three major fault systems[J].Geophysical Research Letters,2008,35(17):L17305.doi:10.1029/2008GL034903.
    [6]单斌,熊熊,郑勇,等.2008年5月12日Mw7.9汶川地震导致的周边断层应力变化[J].中国科学:地球科学,2009,52(5):537-545.
    [7]万永革,沈正康,盛书中,等.2008年汶川大地震对周围断层的影响[J].地震学报,2009,31(2):128-139.
    [8]解朝娣,朱元清,Lei X L,等.Ms8.0汶川地震产生的应力变化空间分布及其对地震活动性的影响[J].中国科学:地球科学,2010,40(6):688-698.
    [9]钱琦,韩竹军.汶川地震对龙泉山断裂地震发生概率的影响研究[J].地球物理学进展,2011,26(2):489-497.
    [10]Chen J H,Froment B,Liu Q Y,et al.Distribution of seismic wave speed changes associated with the 12 May 2008 Mw7.9Wenchuan earthquake[J].Geophysical Research Letters,2010,37(18)L18302.doi:10.1029/20110GL044582.
    [11]马瑾,刘培洵,刘远征.地震活动时空演化中看到的龙门山断裂带地震孕育的几个现象[J].地震地质,2013,35(3):461-471.
    [12]易桂喜,闻学泽,辛华,等.龙门山断裂带南段应力状态与强震危险性研究[J].地球物理学报,2013,56(4):1 112-1 120.
    [13]Aki K.Asperities,barriers,characteristic earthquakes and strong motion prediction[J].Journal of Geophysical Research:Solid Earth,1984,89(B7):5 867-5 872.
    [14]Wiemer S,Wyss M.Mapping the frequency‐magnitude distribution in asperities:an improved technique to calculate recurrence times?[J].Journal of Geophysical Research:Solid Earth,1997,102(B7):15 115-15 128.
    [15]Wyss M,Schorlemmer D,Wiemer S.Mapping asperities by minima of local recurrence time:San Jacinto‐Elsinore fault zones[J].Journal of Geophysical Research:Solid Earth(1978-2012),2000,105(B4):7 829-7 844.
    [16]Gutenberg B,Richter C F.Frequency of earthquakes in California[J].Bulletin of the Seismological Society of America,1944,34(4):185-188.
    [17]Scholz C H.The frequency-magnitude relation of microfracturing in rock and its relation to earthquakes[J].Bulletin of the Seismological Society of America,1968,58(1):399-415.
    [18]Wyss M.Towards a physical understanding of the earthquake frequency distribution[J].Geophysical Journal of the Royal Astronomical Society,1973,31(4):341-359.
    [19]Lahaie F,Grasso J R.Loading rate impact on fracturing pattern:Lessons from hydrocarbon recovery,Lacq gas field,France[J].Journal of Geophysical Research:Solid Earth(1978-2012),1999,104(B8):17 941-17 954.
    [20]Zuiga F R,Wyss M.Most-and least-likely locations of large to great earthquakes along the Pacific coast of Mexico estimated from local recurrence times based on b-values[J].Bulletin of the Seismological Society of America,2001,91(6):1 717-1 728.
    [21]易桂喜,闻学泽,范军,等.由地震活动参数分析安宁河—则木河断裂带的现今活动习性及地震危险性[J].地震学报,2004,26(3):294-303.
    [22]易桂喜,闻学泽.多地震活动性参数在断裂带现今活动习性与地震危险性评价中的应用与问题[J].地震地质,2007,29(2):254-271.
    [23]Wyss M,Stefansson R.Nucleation points of recent mainshocks in southern Iceland,mapped by b-values[J].Bulletin of the Seismological Society of America,2006,96(2):599-608.
    [24]易桂喜,闻学泽,辛华,等.2008年汶川Ms8.0地震前龙门山—岷山构造带的地震活动性参数与地震视应力分布[J].地球物理学报,2011,54(6):1 490-1 500.
    [25]闻学泽,胡先明.从地震活动参数分析石棉:巧家断裂带的现今活动性[J].地震研究,1984,7(2):163-170.
    [26]邓起东,陈社发,赵小麟.龙门山及其邻区的构造和地震活动及动力学[J].地震地质,1994,16(4):389-403.
    [27]Xu Z,Ji S,Li H,et al.Uplift of the Longmen Shan range and the Wenchuan earthquake[J].Episodes,2008,31(3):291.
    [28]陈立春,冉勇康,王虎,等.芦山地震与龙门山断裂带南段活动性[J].科学通报,2013,58(20):1 925-1 932.
    [29]闻学泽,张培震,杜方,等.2008年汶川8.0级地震发生的历史与现今地震活动背景[J].地球物理学报,2009,52(2):444-454.
    [30]徐锡伟,陈桂华,于贵华,等.芦山地震发震构造及其与汶川地震关系讨论[J].地学前缘,2013,20(3):11-20.
    [31]Benioff H.Earthquakes and rock creep(Part I:creep characteristics of rocks and the origin of aftershocks)[J].Bulletin of the Seismological Society of America,1951,41(1):31-62.
    [32]王辉,刘杰,石耀霖,等.鲜水河断裂带强震相互作用的动力学模拟研究[J].中国科学:D辑,2009,38(7):808-818.
    [33]黄玮琼,李文香,曹学锋.中国大陆地震资料完整性研究之二[J].地震学报,1994,16(4):423-432.
    [34]石耀霖,张贝,张斯奇,等.地震数值预报[J].物理,2013,42(4):237-255.
    [35]King G C P,Stein R S,Lin J.Static stress changes and the triggering of earthquakes[J].Bulletin of the Seismological Society of America,1994,84(3):935-953.
    [36]Harris R A.Introduction to special section:Stress triggers,stress shadows,and implications for seismic hazard[J].Journal of Geophysical Research:Solid Earth(1978–2012),1998,103(B10):24 347-24 358.

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