2011年3月24日缅甸7.2级地震对云南地区的影响研究
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
利用2011年1—6月云南地区的连续波形资料,采用背景噪声和波形互相关方法分别反演该地区的速度结构以及2011年3月24日缅甸7.2级地震前后60d的速度变化图像。同时,根据云南地区中小地震计算缅甸地震前后应变能释放响应比空间分布,并利用缅甸地震的震源参数,计算了缅甸地震对云南地区主要断裂产生的库仑破裂应力影响。结果显示:(1)禄劝至华坪一带、永定至泸水区域和通海至建水地区震后波速增加,同时该地区地震活动增强,相应断裂上库仑破裂应力增加,说明缅甸地震对这些区域具有加速构造活动的正影响;(2)小江断裂带以东马龙至宣威地区和南汀河断裂带以南临沧至景洪地区震后波速降低,地震活动减弱,断裂上库仑破裂应力降低,说明缅甸地震对该区域具有减缓构造活动的负影响。
The velocity structure and the velocity variation in the sixty days before and after the Myanmar earthquake(MS 7.2) on March 24,2011 are inverted by the ambient noise and cross-correlation method,using the continuous seismic waveform records from January to June,2011 in Yunnan region.Meanwhile,the spatial response ratio distribution of strain energy release is obtained using moderate and small earthquakes,and the coulomb stress impacts in different faults caused by the Myanmar earthquake are calculated using the source parameters of the Myanmar earthquake.The results show that in Luquan-Huaping,Yongding-Lushui,and Tonghai-Jianshui regions,the velocities increase,and the seismic activity and coulomb stress in corresponding fault zones of these regions are enhanced,reflecting the positive impact on tectonic activities;in Malong-Xuanwei and Lincang-Jinghong regions,the seismic activity and coulomb stress in fault zone of these regions are decreased,reflecting the negative impact on tectonic activities.
引文
[1]Socquet A.Cenozoic deformation in western Yunnan(China-Myanmar border)[J].Journal of Asian Earth Sciences,2005,24:495-515.
    [2]Lacassin P,Replumaz A,Leloup P H.Hairpin river loops and slip-sense inversion on southeast Asian strike-slip faults[J].Geology,1998,26(8):703-706.
    [3]常祖峰,安晓文,陈刚,等.2011年3月24日缅甸孟帕亚M7.2级地震地震构造浅析[J].国际地震动态,2011,388:52-56.
    [4]刘建中.缅甸弧的俯冲作用及川滇断块的地震地质特征[J].中国地震,1992,8(1):68-75.
    [5]胡家富,胡毅力,夏静瑜,等.缅甸弧及邻区的壳幔S波速度结构与动力学过程[J].地球物理学报,2008,51(1):140-147.
    [6]冯德益,郑斯华,盛国英,等.我国西部地区一些强震及中强震前后波速异常的初步研究(一):波速比异常[J].地球物理学报,1976,19(3):196-205.
    [7]房立华,吴建平,吕作勇.华北地区基于噪声的瑞利面波群速度层析成像[J].地球物理学报,2009,52(3):663-671.
    [8]李昱,姚华建,刘启元,等.川西地区台阵环境噪声瑞利波相速度层析成像[J].地球物理学报,2010,53(4):842-852.
    [9]杨文,刘杰,史海霞,等.用噪声成像方法研究云南地区强震前地震面波速度变化[J].地震,2011,31(3):103-111.
    [10]Cheng X,Niu F,Wang B S.Coseismic velocity change in the rupture zone of the2008M W 7.9Wenchuan earthquake ob-served from ambient seismic noise[J].Bulletin of the Seismo-logical Society of America,2010,100(5):2539-2550.
    [11]李军,金星,周峥嵘,等.利用地震噪声准实时监测短周期面波波速变化[J].地震学报,2009,31(6):629-640.
    [12]Bensen G D,Ritzewoller M H,Barmin M P,et al.Process-ing seismic ambient noise data to obtain reliable broad-band surface wave dispersion measurements[J].Geophysical Jour-nal International,2007,169(3):1239-1260.
    [13]Lin F C,Ritzwoller M H,Townend J,et al.Ambient noise Rayleigh wave tomography of New Zealand[J].Geophysical Journal International,2007,170(9):649-666.
    [14]Lin F C,Moschetti M P,Ritzwoller M H.Surface wave tomography of the western United States from ambient seis-mic noise:Rayleigh and Love wave phase velocity maps[J].Geophysical Journal International,2008,173(2):281-298.
    [15]罗桂纯,葛洪魁,王宝善,等.利用相关检测进行地震波速变化精确测量研究进展[J].地球物理学进展,2008,23(1):56-62.
    [16]Wearver R L.Information from seismic noise[J].Science,2005,307:1568-1569.
    [17]Céspedes I,Huang Y,Ophir J.Methods for estimation of subsample time delays of digitized echo signals[J].Ultrasonic Imaging,1995,17:142-171.
    [18]Schaff D P,Beroza G C.Coseismic and postseismic velocity changes measured by repeating earthquakes[J].Journal of Geophysical Research,2004,109:B10302.
    [19]刘志坤,黄金莉.利用背景噪声互相关研究汶川地震震源区地震波速度变化[J].地球物理学报,2010,53(4):853-863.
    [20]刘福田,李强,吴华,等.用于速度图像重建的层析成像法[J].地球物理学报,1989,32(1):46-61.
    [21]Humphreys E,Clayton R W.Adaptation of back projection tomography to seismic travel time problems[J].Journal of Geophysical Research,1988,93(B2):1073-1085.
    [22]Inoue H,Fukae Y,Tanabe K,et al.Whole mantle P-wave travel time tomography[J].Physics of the Earth and Planeta-ry Interiors,1990,59(4):294-328.
    [23]胡家富,苏有锦,朱雄关,等.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,2003,33(8):714-722.
    [24]何正勤,叶太兰,苏伟.云南地区地壳中上部横波速度结构研究[J].地球物理学报,2004,47(5):838-844.
    [25]黄金莉,赵大鹏,郑斯华.川滇活动构造区地震层析成像[J].地球物理学报,2001,44(增刊):127-136.
    [26]Wyss M,Wiemer S.Change in the probability for earth-quakes in Southern California due to the landers magnitude 7.3earthquake[J].Science,2000,290(17):1334-1338.
    [27]刘桂萍,傅征祥.1976年7月28日唐山7.8级地震触发的区域地震活动和静应力场变化[J].地震学报,2000,22(1):17-26.
    [28]万永革,吴忠良,周公威,等.地震应力触发研究[J].地震学报,2002,25(5):553-551.
    [29]程佳,刘杰,甘卫军,等.汶川地震同震形变场对川滇地区主要活动断裂地震发生趋势的影响[J].地震学报,2009,31(5):477-490.
    [30]程佳,刘杰,甘卫军,等.川滇菱形块体东边界各断层段强震演化特征研究[J].中国科学:D辑,2011,41(9):1311-1326.
    [31]Wells D L,Coppersmith K J.New empirical relationships among magnitude,rupture length,rupture width,rupture area,and surface displacement[J].Bulletin of the Seismolog-ical Society of America,1994,84:974-1002.
    [32]Julian B R,Foulger G R.Time-dependent seismic tomo-graphy[J].Geophysical Journal International,2010,182:1327-1338.

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