Simultaneous inversion of the aftershock data of the 1993 Killari earthquake in Peninsular India and its seismotectonic implications     

S. Mukhopadhyay  J. R. Kayal  K. N. Khattri  B. K. Pradhan 《Journal of Earth System Science》2002,111(1):1-15

The aftershock sequence of the September 30th, 1993 Killari earthquake in the Latur district of Maharashtra state, India, recorded by 41 temporary seismograph stations are used for estimating 3-D velocity structure in the epicentral area. The local earthquake tomography (LET) method of Thurber (1983) is used. About 1500P and 1200S wave travel-times are inverted. TheP andS wave velocities as well asV _P/V_Sratio vary more rapidly in the vertical as well as in the horizontal directions in the source region compared to the adjacent areas. The main shock hypocentre is located at the junction of a high velocity and a low velocity zone, representing a fault zone at 6–7 km depth. The estimated average errors ofP velocity andV _P/V_Sratio are ±0.07 km/s and ±0.016, respectively. The best resolution ofP and S-wave velocities is obtained in the aftershock zone. The 3-D velocity structure and precise locations of the aftershocks suggest a ‘stationary concept’ of the Killari earthquake sequence.  相似文献   

The role of small earthquakes in redistributing crustal elastic stress   总被引：1，自引：0，他引：1  

D. Marsan 《Geophysical Journal International》2005,163(1):141-151

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Source parameters for the Roermond aftershocks of 1992 April 13-May 2 and site spectra for P and S waves at the Belgian seismic network     

Mihnea-Corneliu Oncescu  Thierry Camelbeeck  Henri Martin 《Geophysical Journal International》1994,116(3):673-682

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Probabilistic seismic hazard estimation in low-seismicity regions considering non-Poissonian seismic occurrence   总被引：1，自引：0，他引：1  

Céline Beauval  Sebastian Hainzl  Frank Scherbaum 《Geophysical Journal International》2006,164(3):543-550

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基于早期余震的地震烈度评估方法研究——以2021年青海玛多Ms7.4地震为例     

赵怀群  陈文凯  康燈杰  贾艺娇  史一彤 《地质论评》2023,69(Z1):447-448

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唐山与通海两大地震的强余震的差别及其原因探讨          下载免费PDF全文

李保昆  刁桂苓  Avi Shapir  冯向东 《地震工程学报》2009,31(2):161-166

1970年通海地震序列与1976年唐山地震序列的对比表明,两次地震的余震衰减,余震强度和频度,余震分布区的形状等有区别.对此提出了一种解释：若余震分布区域的长轴长度a与短轴长度b之比a/b越大,则震源体越接近于一个面,在一个面上进行的调整过程应当比较简单,余震的衰减比较快,强余震比较少而小;反之则震源体越表现出一个体的形态,在一个体内进行的调整过程应当比较复杂,余震衰减比较慢,强余震比较多而大.对于那些在主震后能够很快进行定位并勾画出余震区域轮廓的情况,可以尝试利用a/b快速判断后面强余震的多少以及余震衰减的快慢.  相似文献   

Wavelet‐based simulation of spectrum‐compatible aftershock accelerograms     

S. Das  V. K. Gupta 《地震工程与结构动力学》2008,37(11):1333-1348

In damage‐based seismic design it is desirable to account for the ability of aftershocks to cause further damage to an already damaged structure due to the main shock. Availability of recorded or simulated aftershock accelerograms is a critical component in the non‐linear time‐history analyses required for this purpose, and simulation of realistic accelerograms is therefore going to be the need of the profession for a long time to come. This paper attempts wavelet‐based simulation of aftershock accelerograms for two scenarios. In the first scenario, recorded main shock and aftershock accelerograms are available along with the pseudo‐spectral acceleration (PSA) spectrum of the anticipated main shock motion, and an accelerogram has been simulated for the anticipated aftershock motion such that it incorporates temporal features of the recorded aftershock accelerogram. In the second scenario, a recorded main shock accelerogram is available along with the PSA spectrum of the anticipated main shock motion and PSA spectrum and strong motion duration of the anticipated aftershock motion. Here, the accelerogram for the anticipated aftershock motion has been simulated assuming that temporal features of the main shock accelerogram are replicated in the aftershock accelerograms at the same site. The proposed algorithms have been illustrated with the help of the main shock and aftershock accelerograms recorded for the 1999 Chi–Chi earthquake. It has been shown that the proposed algorithm for the second scenario leads to useful results even when the main shock and aftershock accelerograms do not share the same temporal features, as long as strong motion duration of the anticipated aftershock motion is properly estimated. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

2019年地震活动综述     

杜方 《四川地震》2020,(1):1-5

回顾总结了2019年地震活动,从全球到局部,呈现了全球、中国和四川的地震活动概况;分析了全球、中国和四川地震活动的特征;记叙了2019年四川区域内发生的突出地震事件;追踪了2008年汶川8.0级地震以来四川区域内发生的3次7级以上地震的余震活动。结果显示:2019年全球M≥7.0地震活动特征呈现低频次、低强度,主体地区为环太平洋地震带;我国周边未发生M≥7.0地震,表明影响我国地震活动的动力边界地震活动偏弱,我国大陆和邻区地震活动表现出频次低、强度弱的特点,我国大陆地震分布总体显示强度西强东弱,区域上显示M≥5级地震分布于青藏地块、西域地块和华南地块;台湾及其附近海域地震活动频次和强度也偏低;四川区域地震活动强度呈现东强西弱特征,四川区域突出地震事件全部集中在川东南区域;2008年以来,四川区域的汶川8.0级、芦山7.0级和九寨沟7.0级地震的余震持续活动。  相似文献   

2019年6月17日四川长宁M6.0地震的快速测定与数据产品产出     

邹立晔  黄志斌  周静  梁姗姗  赵博  杜广宝  刘敬光  陈宏峰 《中国地震》2019,35(3):573-583

2019年6月17日22时55分(北京时间),四川宜宾市长宁县发生了M6.0地震。中国地震台网中心用时10min发布正式速报结果,并开展余震监测和统计。同时,中国地震台网中心联合各有关单位,对台网数据进行分析处理,产出10类19种数据产品。产品结果显示:四川长宁M6.0地震极震区烈度达Ⅶ度,为一次逆冲型为主的事件,余震呈NWW向展布。据主震和余震分布方向,由区域地震构造图可初步推测,发震断层为NW向隐伏断层。  相似文献   

基于地震学资料探讨2013年岷县漳县6.6级地震发震构造          下载免费PDF全文

张元生  冯红武  陈继锋  刘白云 《地震工程学报》2013,35(3):419-424

应用速度和Q值成像方法以及小震精定位方法获得了2013年岷县漳县6.6级地震震源区的深部结构和余震序列的空间分布图像。结果表明:发震断层为一隐伏断裂,走向NW,倾向SW,逆冲兼左旋走滑,在地表距临潭-宕昌断裂岷县段约20km,在深部可能与临潭-宕昌断裂交汇在一起,向南组成一条NW向的断裂带。2003年11月13日岷县MS5.2、2004年9月7日岷县-卓尼MS5.0和本次MS6.6地震的发震断层可能属同一发震断层,位于漳县南部块体的西南边缘;该块体为次级块体(三角形),近几年来块体西南边界强震活跃,其它两边平静。  相似文献