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κ���  ��һ��  �ս��� 《大地测量与地球动力学》2014,34(5):17-20

??????M8.0????????????????????С???????????????????о???????????λ????????????????????ν???ие???????????????????1??M8.0??????????????????????????????????????С????????????????????????????????????????????????42°????????????????????????????20 km??2?????????????????????????????????????10 km?????????????????С??????????????????????????????????????????????????????λ?????????7 km??3??2??14??
ML3.7?????????????????93°?????????????????????С??????????????????????????????????2???????￡????????????????????????????????????????????????????????????????4??2??28??ML3.8?????????λ?????????????????????????????????????????????????????????￡????????????  相似文献   

利用区域宽频地震数据反演2021年5月云南漾濞M_S6.4地震震源破裂过程     

朱音杰  罗艳  赵里  田建慧 《地球物理学报》2022,(3)

本文基于有限断层模型反演方法,利用区域宽频带数据反演了2021年5月云南漾濞M_S6.4地震的震源破裂过程,结果显示:此次地震的发震断层走向为SE向,主要以右旋走滑为主.破裂主要发生在震源东南侧,最大错动量约为0.55 m,位于深度约9 km处,发生明显破裂的深度约达13 km.此次地震释放的标量地震矩为1.48×10¹⁸N·m,相当于矩震级M_W6.05.地震能量主要在前11 s释放.在深度为6~8 km处破裂速度有明显的变快,可能加剧了地表的震动.  相似文献   

Rapid report of the 8 January 2022 ​MS 6.9 Menyuan earthquake,Qinghai, China     

Hongfeng Yang  Dun Wang  Rumeng Guo  Mengyu Xie  Yang Zang  Yue Wang  Qiang Yao  Chuang Cheng  Yanru An  Yingying Zhang 《地震研究进展（英文）》2022,2(1):100113

The M_S 6.9 Menyuan earthquake in Qinghai Province, west China is the largest earthquake by far in 2022. The earthquake occurs in a tectonically active region, with a background b-value of 0.87 within 100 ?km of the epicenter that we derived from the unified catalog produced by China Earthquake Networks Center since late 2008. Field surveys have revealed surface ruptures extending 22 ?km along strike, with a maximum ground displacement of 2.1 ?m. We construct a finite fault model with constraints from InSAR observations, which showed multiple fault segments during the Menyuan earthquake. The major slip asperity is confined within 10 ?km at depth, with the maximum slip of 3.5 ?m. Near real-time back-projection results of coseismic radiation indicate a northwest propagating rupture that lasted for ～10 ?s. Intensity estimates from the back-projection results show up to a Mercalli scale of IX near the ruptured area, consistent with instrumental measurements and the observations from the field surveys. Aftershock locations (up to January 21, 2022) exhibit two segments, extending to ～20 ?km in depth. The largest one reaches M_S 5.3, locating near the eastern end of the aftershock zone. Although the location and the approximate magnitude of the mainshock had been indicated by previous studies based on paleoearthquake records and seismic gap, as well as estimated stressing rate on faults, significant surface-breaching rupture leads to severe damage of the high-speed railway system, which poses a challenge in accurately assessing earthquake hazards and risks, and thus demands further investigations of the rupture behaviors for crustal earthquakes.  相似文献   

Temporal and spatial rupture process of the great Kunlun Mountain Pass earthquake of November 14, 2001 from the GDSN long period waveform data   总被引：7，自引：0，他引：7  

XU Lisheng & CHEN Yuntai Institute of Geophysics  China Seismological Bureau  Beijing  China 《中国科学D辑(英文版)》2005,48(1):112-122

The temporal and spatial rupture process of the 14 November 2001 Kunlun Mountain Pass earthquake (KMPE) is obtained by inverting the high signal-to-noise-ratio P-waveform data of vertical components of 20 stations with epicentral distances less than 90°, which are of Global Digital Seismogragh Network (GDSN). The inverted results indicate that the KMPE consists of 3 sub-events. The rupture of the first sub-event initiated at the instrumental epicenter (35.97°N, 90.59°E) and then propagated both westwards and eastwards, extending 140 km westwards at the speed of 4.0 km/s and 80 km eastwards at the speed of 2.2 km/s, which appeared to be an asymmetrical bilateral rupture dominantly from east to west. This sub-event formed a 220-km-long fault. Fifty-two seconds after initiation of the first sub-event, at which time the first sub-event was not over but in its healing phase, the rupture of the second sub-event initiated 220 km west of the epicenter and propagated both westwards and eastwards, extending 50  相似文献   

2019年四川长宁M_S6.0地震前破裂区内视应力和b值的变化     

陈学忠  李艳娥  宫悦  陈丽娟 《地震科学进展》2021,(2):49-58

视应力和b值都可以反映地壳应力变化。当应力增加时,视应力会增加,而b值降低。因此,应力变化将导致视应力和b值之间呈负相关关系,即,根据视应力和b值之间的负相关关系可以研究地壳构造应力的变化。本文利用2000年1月—2019年12月长宁M_S6.0地震破裂区内3.0≤M_L≤3.6地震的视应力和2.0≤M_L≤4.3地震目录,研究了视应力和b值随时间的变化,发现:2013年2月—2017年3月间,视应力呈趋势上升变化,历时约4年,在震前两年时间内,视应力仍维持在较高水平。在视应力呈趋势上升变化期间,b值则呈趋势下降变化。当视应力维持在较高水平时,b值则维持在较低水平。即,长宁M_S6.0地震发生前,破裂区内视应力增加,同时b值下降。这表明,2019年长宁M_S6.0地震发生前破裂区内存在明显的构造应力增加过程,对地震孕育过程的认识和地震预测研究都具有启示意义。   相似文献   

Simulation of the spontaneous growth of a dynamic crack without constraints on the crack tip path   总被引：2，自引：0，他引：2  

Nobuki Kame  & Teruo Yamashita 《Geophysical Journal International》1999,139(2):345-358

The spontaneous growth of a dynamic in-plane shear crack is simulated using a newly developed method of analysis in which no a priori constraint is required for the crack tip path, unlike in other classical studies. We formulate the problem in terms of boundary integral equations; the hypersingularities of the integration kernels are removed by taking the finite parts. Our analysis shows that dynamic crack growth is spontaneously arrested soon after the bending of the crack tips, even in a uniformly stressed medium with homogeneously distributed fracture strengths. This shows that the dynamics of crack growth has a significant effect on forming the non-planar crack shape, and consequently plays an essential role in the arrest of earthquake rupturing.  相似文献   

鲍店煤矿主副井筒破裂原因及防治对策     

曹丁涛 《煤田地质与勘探》1997,25(6):38-40

鲍店煤矿主副井筒变形破裂,严重威胁矿井安全,经济损失巨大。通过观察分析,认为变形破裂乃第四系水位下降引起的地面沉降所致,并据此提出了防治对策。   相似文献   

1995年日本兵库县南部地震时淡路岛上出现的地震断层的形态特征     

林爱明 《高校地质学报》1995,1(1):22-33

1995年日本兵库县南部地震时在淡路岛上出现的地表地震断层主要由三条地表破裂带组成、野岛地震断层、松帆地震层和楠本地震断层。野岛地震断层从淡路岛北端的淡路町住西南延伸到一宫町的尾崎,长达18km,其北段沿着早期存在的野岛断层分布,而南段则作为新断层出现,野岛地震断层的断层的北段主要由一些相互平行或次平行的右列剪切断层和许多左列和性裂隙组成,其南段则是由集中在十多米宽的大量不连续的地表破裂带所组成。野岛地震断层一般走向N30°～60°E倾向SE,地貌错位和断层擦痕均显示出此断层为一具有逆断层性质的右旋走滑断层,沿一些主要露头测定的北段水平位移量一般为100～200cm,垂直位移量为5O～100cm;而南段的水平、垂直位移量均只有几厘米至20cm。最大位移量在平林断层崖测得;水平180cm、垂直l30cm、实际位移量2l5cm。松帆地震断层走向N40°～60°W,沿着淡路岛北端部的海岸线分布,长达约1km。楠本地震断层沿早期存在的楠本断层出现,分布于淡路岛东北部的海岸边上,走向N35°～6O°W倾向NW 。根据地表地震断层的形态及地貌错位特征,野岛地震断层可被分为四条断层段,并在形态上呈现右列。地质和地貌证据以及余震分布的特征清楚地表明这4条断层段的几何形态和分布特征是受早期存在的地质构造所控制的,同时也说明了地震断层的破裂过程具有拉分(pulling-apart)和推隆(pushing－up)的过程,这两个过程分别产生了张性裂隙、拉分盆地、逆断层和挤压隆起等构造。  相似文献   

板内逆断层地震破裂的基本特征及分段标志研究   总被引：1，自引：0，他引：1       下载免费PDF全文

侯康明  闻学泽 《地震工程学报》1999,21(3):302-309

通过对１６ 个板内逆断层地震的基本类型、构造环境、地震地表破裂尺度、几何形态、运动学特征及余震分布图像的研究分析,较系统地归纳了板内逆断层地震破裂的基本特征及分段标志．研究表明：（１） 逆断层破裂往往沿走向延伸较短,常表现为二维面状分布形态;（２） 地震断层未出露地表或仅有部分出露地表;（３） 逆断层地震破裂较走滑断层和正断层产生的地震破裂更为复杂,不仅表现在构成整体破裂带的各个单条破裂的力学性质差异方面,而且表现在几何结构方面．  相似文献   

Rupture process of the M_L=4.1 earthquake in Huailai Basin on July 20, 1995     

许向彤  陈运泰  王培德 《地震学报(英文版)》1999,(6)

IntroductionIntheanalogrecordingera,onlyarrivaltimePwaveonsetandmaximumamplitudeofrecordingswereusedtocalculatetheparametersofearthquakefool.Sincelate1970s,withtheincreasingnumberofdigitalseismicnetworkcomingintooperation,itispossibletodofurtherresearchesinfocalphysics.Toinvertmoredetailedparameterssuchastempo-spatialprocessesofearthquakefoolusingdigitalseismicdataisanimportantfieldindigitalseismology.Sourcetimefunction(STF)isoneofkeyparametersaboutruptureprocessesofearthquakefocuses.Spontan…  相似文献