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匹配条件: “Stress drop<br>汶川8.0级地震” ,找到相关结果约235970条。
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A study on segmentation characteristics of aftershock source parameters of Wenchuan M8.0 earthquake in 2008
2008年汶川8.0级地震序列震源参数分段特征的研究

HUA Wei,CHEN Zhang-Li,ZHENG Si-Hua,
华卫

地球物理学报 , 2009,
Abstract: 本文利用四川省区域固定地震台网观测记录到的2008年汶川8.0级地震序列的资料,从中挑选部分台站和地震资料,在精确扣除了余震区地震波衰减与台站场地响应后,计算得到了汶川地震序列中1070次ML≥3.0级地震的震源参数,结果显示,地震矩与震级之间有较好的线性关系,应力降和视应力的大小与震级大小有关.利用ML3.0级地震资料得到的应力降的时空演变过程研究结果表明,汶川余震序列地震应力降总体上随时间是一个衰减过程,预示着主震发生后整个余震区应力降呈逐渐衰减的状态.主震发生之后,以虎牙-北川-安县为界,空间上龙门山断裂带上地震活动水平和应力降具有明显的分段性.5月17日之前ML≥5.0余震主要集中在龙门山断裂带北川以西,由于地震释放了较多应力,该地区应力降较低,而北川至青川之间地震活动水平相对较弱,应力降一直处于高值水平.5月17日之后,ML≥5.0余震活动主体地区则转移到北川至青川之间,在该段发生了5月25日青川6.4级最大余震,在这之后,整个余震序列应力降随时间变化开始趋于平稳.
A study on the occurrence background and process of Wenchuan MS8.0 earthquake
汶川MS8.0级地震发生背景与过程的研究

CHEN Zhang-Li,ZHAO Cui-Ping,WANG Qin-Cai,HUA Wei,ZHOU Lian-Qing,SHI Hai-Xia,CHEN Han-Lin,
陈章立

地球物理学报 , 2009,
Abstract: 本文首先阐明汶川MS8.0级地震发生在由区域布格重力异常和地震震中分布所确定的武都—松潘—茂汶—汶川—泸定地震带上.汶川地震所在地段是地震前兆和中小地震(M≤7.0)的空白区,震前出现明显的孕震空区,MS8.0级地震发生在空区周围区域中小地震活动峰值之后的减少段里.地震的破裂超出孕震空区范围,空区内、外余震活动呈现出不同的衰减特征,依此将余震活动分为WS和NE两个区段.地震破裂过程、4级以上余震矩张量及震区应力场反演和余震应力降的测定结果表明,两个区域的位错、余震机制解和应力降及最大主应力的方〖JP2〗向等明显有别.根据这些特征和地震应力触发的研究,推测NE段地震的发生可能是〖JP〗由WS段主破裂的发生所触发.
PRELIMINARY STUDY OF PALEOEARTHQUAKES BASED ON EARTHQUAKE TERRACE AND OFFSET TERRACE INVESTIGATION AFTER WENCHUAN MS8.0 EARTHQUAKE
汶川8.0级地质发震断层逆冲活动的地震地貌与古地震初步研究

Tian Qinjian,Hao Kai,Wang Lin,Ma Baoqi,Zhang Shimin,
田勤俭
,郝凯,王林,马保起,张世民

第四纪研究 , 2009,
Abstract: 与河流阶地相关的地震地貌包括地震阶地和阶地断错两方面.地震阶地是古地震事件的直接反映;阶地断错则是多次古地震事件的累积效应.文章在汶川8.0级地震破裂带调查的基础上,讨论了平行断裂的河流和横穿断裂的河流两种情况下的阶地发育特征.在此基础上,应用差分GPS测量技术,分别对虹口附近的地震阶地和映秀附近阶地断错现象进行了测量.研究结果表明,虹口附近地震阶地反映了自白沙河Ⅱ级阶地形成以来发生了5次规模基本相当的断错事件;映秀附近的阶地累积位错量反映了不同级阶地经历了不同数量的地震事件,其中,Ⅱ级阶地形成以来大致经历了5次与汶川8.0级地震位错相当的地震事件.两个地点的地震阶地和阶地位错研究得到了一致的古地震次数.本文进一步讨论了前人对该区阶地的测年数据,从而推测得到汶川8.0级地震发震断层的古地震复发间隔约为4ka.
Surface deformation in the Chengdu plain area produced by the Wenchuan MS8.0 earthquake of 12 May 2008, Sichuan, China
成都平原内汶川MS8.0级地震的地表变形

YANG Xiao-Ping,LI An,LIU Bao-Jin,FENG Shao-Ying,CHEN Xian-Cheng,SHI Jin-Hu,KOU Kun-Peng,GUO Xin-Jing,
杨晓平
,李安,刘保金,酆少英,陈献程,石金虎,寇昆朋,郭新景

地球物理学报 , 2009,
Abstract: The 12 May 2008 Wenchuan MS8.0 earthquake occurred on the Longmen Shan (Mountains) thrust-nappe structure zone in the eastern margin of the Tibetan plateau. It has produced 240 km long and 72 km long rupture zones on the surface along the Yingxiu-Beichuan fault and Guanxian-Jiangyou fault, respectively, which are branches of the Longmen Shan fault system. Besides, our field investigation found that this shock has also caused a weak rupture zone on the ground nearby the Shigu town, Shifang city that lies in the western Chengdu plain east to the epicenter. This rupture zone and the other two ruptures in the Longmen Shan mountainous area aforementioned constitute a northwest-dipping imbricate structure. It is about 7.5 km long, trends in 30°, manifested by a series of directed deformation phenomenon such as damages of buildings, channel dislocations, ground folds, erupted sand and earth fissures on the surface. Observations in the exploratory trenches indicate that there is a fold uplift of 0.2 m in the youngest strata (including the surface) produced by the Wenchuan MS8.0 event, and a fold uplift of 0.4 m in the clay bottom in the trench, presumably resulted from a paleoearthquake of similar size to the Wenchuan shock in 2008. Seismic exploration to shallow subsurface demonstrates that in the place of the Chengdu plain with the found seismic rupture zone exists active faults of the late Pleistocene as well as active folds of the Quaternary.
Preliminary study of coseismic fault gouge occurred in the slip zone of the Wenchuan Ms 8.0 earthquake and its tectonic implications
四川汶川5.12大地震同震滑动断层泥的发现及意义

FU BiHong,WANG Ping,KONG Ping,ZHENG GuoDong,WANG Gang,SHI PiLong,
付碧宏
,王萍,孔屏,郑国东,王刚,时丕龙

岩石学报 , 2008,
Abstract: Intensive coseismic surface deformation was produced by the 12 May 2008 Wenchuan Ms 8.0 earthquake along the pre-existing NE-trending Yingxiu-Beichuan and the Guanxian-Anxian faults, in the Longmen Shan fault zone. The post-earthquake geological investigation shows that the most of surface ruptures occurred along the carbonaceous argillite, shale and coal-bearing layers, which are low-frictional layers to form slip interface within the fault zone. We found that fresh fault gouges with a thickness of 1~2 cm occurred along the co-seismic surface rupture zone, which suggests that the coseismic slip concentrated in a narrow slip zone of thickness ranging from 0.5~2 cm although the coseismic vertical and horizontal dislocations are larger than 6 meters. These fresh fault gouges within co-seismic slip zone are resulted from both thermal pressurization and frictional melting during rapid faulting movement at the shallow crust level.
Relationships between surface ruptures and lithologic characteristics of the Wenchuan Ms 8.0 earthquake
汶川8.0级地震地表破裂带与岩性关系

WANG Ping,FU Bi-Hong,ZHANG Bin,KONG Ping,WANG Gang,
王萍

地球物理学报 , 2009,
Abstract: Two co-seismic surface rupture zones, 230 km and 70 km long, are produced by the 2008 Wenchuan Ms 8.0 earthquake along the pre-existing Yingxiu-Beichuan fault and the Guanxian-Anxian fault, respectively, in the Longmen Shan fault zone. The post-earthquake geological study shows that the exposed fault planes accompanying with co-seismic scarps usually occurred along the coal seams and carbonaceous shales. In this paper we present the observed results of fault scarps and the slip surface in some typical locations along the co-seismic rupture zones. Comparing with the 1:50000 regional geological map, it shows that the distribution of the major section (the southwest part) of the Yingxiu-Beichuan co-seismic rupture zone and the Guanxian-Anxian co-seismic rupture zone are corresponding with the exposed area of the Upper Triassic Xujiahe coal-bearing strata in the Longmen Shan region. The Upper Triassic Xujiahe coal seam and the Middle-Lower Triassic and Silurian, Cambrian shales in the Longmen Shan region are the flexible rock layers, which are easy to slide and form detachment surface or detritus within the fault zone. The co-seismic rupture zone produced by the May 12 Wenchuan Ms 8.0 great earthquake resulted from a B-type sliding along the flexible rock layers in the shallow crust level.
PRELIMINARY RESEARCH ON LIQUEFACTION CHARACTERISTICS OF WENCHUAN 8.0 EARTHQUAKE
汶川8.0级地震液化特征初步研究

YUAN Xiaoming,CAO Zhenzhong,SUN Rui,CHEN Longwei,MENG Shangjiu,DONG Lin,WANG Weiming,MENG Fanchao,CHEN Hongjuan,ZHANG Jianyi,CAI Xiaoguang,
袁晓铭
,曹振中,孙锐,陈龙伟,孟上九,董林,王维铭,孟凡超,陈红娟,张建毅,蔡晓光

岩石力学与工程学报 , 2009,
Abstract: 针对目前对汶川8.0级地震液化认识尚少的现状,通过较详尽的现场调查以及相关水文、地质资料分析和现场勘察,讨论本次地震的液化分布及特征问题.研究结果表明,本次地震液化范围广,涉及长约500 km、宽约200 km的区域,但分布很不均匀.液化集中在长约160 km、宽约60 km的长方形区域并呈6个条带分布,在VIII度区内最为集中,与各地区的区域水文地质和工程地质条件呈良好的对应关系.通过调查和分析,发现本次地震液化具有与以往不同的3个突出特征:(1) VI度区内出现显著液化及其震害现象,实地发现10处液化点,分布在5个不同地区,其中有2处液化直接导致了房屋的破坏;(2) 深层土液化,4个不同地区的村庄均出现了液化喷水高度达10 m以上,专门的勘察确认了此次地震20 m处液化的真实性;(3) 砂砾层液化,专门的勘察验证这一现象,并且通过液化喷砂量和喷水时间以及工程地质资料的综合分析,推断此次地震中砂砾层液化应占很大比重.
The change characteristics of electromagnetic field before to after Wenchuan M_s8.0 earthquake
汶川8.0级地震前后电磁场的变化特征

高曙德,王立凤,汤吉,杜学彬,刘小凤,苏永刚,陈彦平,狄国荣,梅东林,詹艳
地球物理学报 , 2010,
Abstract: 2008年5月12日汶川M_s8.0地震前后,距震中320 km甘肃陇南汉王地震台的地电阻率、大地电场、ELF电磁等多种观测手段捕捉到这次地震前后的异常信息.本文采用解析方法,着重探讨汶川8.0级地震前后观测到的电磁场变化特征,从电磁现象来探讨汶川M_s8.0地震发生前后,电磁场长、中、短、临期的异常特征和变化规律.自2003年以来甘东南地区及甘川交界发生4次5.0级以上地震,从空间上看,有从南北地震带中段的西北向西南方向移动的特点,强度逐渐增强,其中,文县5.0和两次岷县5.0级以上地震可以视为汶川8.0级地震的前震;从时间上分析,震前陇南汉王地震台观测到电磁场出现了长趋势变化和短临异常变化,其特征:①2003~2008年,ZD8B地电仪观测的N54°W、N85°E和N73°W测道地电阻率均显示出长趋势变化和短期变化;②视电阻率各向异性度'S'年变化率在有震年(异常年)是无震年(正常年)的两倍;③ELF电磁仪观测到了(0.5~39Hz)频率段的电场、磁场在汶川8.0级地震及余震序列中异常变化分别比正常月份大1~5个数量级,并记录到电磁同震现象;④大地电场仪(ZD9A-Ⅱ)在汶川震前17个小时也记录到高频临震变化信息.
汶川8.0级地质发震断层逆冲活动的地震地貌与古地震初步研究
田勤俭,郝凯,王林,马保起,张世民
第四纪研究 , 2009,
Abstract: 与河流阶地相关的地震地貌包括地震阶地和阶地断错两方面。地震阶地是古地震事件的直接反映;阶地断错则是多次古地震事件的累积效应。文章在汶川8.0级地震破裂带调查的基础上,讨论了平行断裂的河流和横穿断裂的河流两种情况下的阶地发育特征。在此基础上,应用差分GPS测量技术,分别对虹口附近的地震阶地和映秀附近阶地断错现象进行了测量。研究结果表明,虹口附近地震阶地反映了自白沙河Ⅱ级阶地形成以来发生了5次规模基本相当的断错事件;映秀附近的阶地累积位错量反映了不同级阶地经历了不同数量的地震事件,其中,Ⅱ级阶地形成以来大致经历了5次与汶川8.0级地震位错相当的地震事件。两个地点的地震阶地和阶地位错研究得到了一致的古地震次数。本文进一步讨论了前人对该区阶地的测年数据,从而推测得到汶川8.0级地震发震断层的古地震复发间隔约为4ka。
DISCUSSION ON RELATION BETWEEN ANOMALIES OF WATER TEMPERATURE AND RADON IN NINGBO STATION AND WENCHUAN Ms8.0 EARTHQUAKE
宁波台水温、水氡异常与汶川8.0级地震关系探讨

Liu Dongying,
刘冬英

大地测量与地球动力学 , 2008,
Abstract: 在分析汶川8.0级震前全国流体异常时发现,距汶川地震震中近1 800千米的浙江宁波地震台的水温和水氡在地震前存在异常.通过对以往资料的对比,认为这次异常与汶川8.0级地震有关.
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