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ANALYSIS OF CHARACTERISTICS OF PRECURSOR WAVE OF LOW FREQUENT IN SHANXI BEFORE WENCHUAN Ms8.0 EARTHQUAKE
汶川Ms8.0地震前山西前兆低频前驱波特征分析

Zhang Shuliang,Liu Ruichun,Ning Yaling,Tang Leili,Li Bin,
张淑亮
,刘瑞春,宁亚灵,唐垒黎,李斌

大地测量与地球动力学 , 2009,
Abstract: The changes of some precursory observation in Shanxi area before Wenchuan Ms8.0 earthquake on May 12,2008 were analysed,and following conclutions are drawn.Firstly,the precursor waves of low frequent are main characters of the precursory change before the earthquake,and its superior period are 64-128 min.Secondly,the distribution of the abnormal points is in the same direction with the primary rupture of Wenchuan Ms8.0 earthquake.Thirdly,low-frequency precursory waves occured in a crowded time,mainly from 1...
Aftershock distribution of the MS8.0 Wenchuan earthquake and three dimensional P-wave velocity structure in and around source region
汶川MS8.0级地震余震分布及周边区域P波三维速度结构研究

WU Jian-Ping,HUANG Yuan,ZHANG Tian-Zhong,MING Yue-Hong,FANG Li-Hua,
吴建平

地球物理学报 , 2009,
Abstract: 利用川滇地区长期积累的地震走时观测资料和汶川地震余震观测资料对汶川地震震源区及周边区域地壳和上地幔P波三维速度结构进行了研究.结果表明,浅部P波速度分布与地表地质之间具有很好的对应关系.龙门山断裂带在20 km以上深度表现为高速异常带,彭灌杂岩体和宝兴杂岩体为局部高速异常区.龙门山断裂带中上地壳的局部高速异常体对汶川地震的余震分布具有明显的控制作用.在余震带南端,余震全部发生在与宝兴杂岩体对应的高速异常体的东北侧;在余震带的中段,与彭灌杂岩体对应的高速异常体在一定程度上控制了余震的分布;在余震带的东北端,宁强—勉县一带的高速异常体可能阻止了余震进一步向东北扩展.龙门山断裂带中上地壳的P波高速异常表明介质具有相对较高的强度,在青藏高原物质向东挤出过程中起到了较强的阻挡作用,有利于深部能量积累.在30 km深度之下,扬子地块具有明显的高速特征,其前缘随深度增加向青藏高原方向扩展,在下地壳和上地幔顶部已达到龙门山断裂带以西.
Relations between gravity variation of Longmenshan fault zone and Wenchuan Ms8.0 earthquake
龙门山断裂带重力变化与汶川8.0级地震关系研究

ZHU Yi-Qing,XU Yun-Ma,Lv Yi-Pei,LI Tie-Ming,
祝意青

地球物理学报 , 2009,
Abstract: 利用成都地区1996~2008年绝对重力和相对重力观测资料获得区域重力场时空动态变化结果,系统分析了龙门山断裂带重力场变化特征及其与汶川8.0级地震的关系.①重力变化与龙门山断裂构造活动存在密切空间联系,重力测量较好地反映了伴随活动断层的物质迁移和构造变形引起的地表重力变化效应.②成都地区重力场动态图像较完整地反映了2008年5月12日汶川8.0级地震孕育、发生过程中出现的流动重力前兆信息.③映秀及北川重力点值时序变化累积量达120×10-8m·s-2,较好地反映了汶川地震前映秀和北川两个极震区附近的重力测点随时间的剧烈波动性上升变化.④汶川地震前,龙门山断裂带东侧的四川盆地相对稳定,而较显著的重力变化发生在龙门山断裂带西侧的川西高原上.
汶川8.0级地震地表破裂迹线附近建筑物的震害分布
Distribution of Seismic Damaged Buildings along the Trace of Ground Surface Rupture Caused by the Ms 8.0 Wenchuan Earthquake
 [PDF]

赵纪生, 吴景发, 师黎静, 刘艳琼
Advances in Geosciences (AG) , 2012, DOI: 10.12677/ag.2012.21001
Abstract:

汶川地震地表破裂带主要分三部分,映秀–北川地表破裂带、通济–雎水地表破裂带、以及小鱼洞地表破裂带。映秀–北川地表破裂带是汶川地震的主要破裂带,处于龙门山中央断裂带上,全长达260 km以上;通济–雎水地表破裂带是汶川地震在前山断裂带上产生的地表破裂,全长约50 km;小鱼洞破裂带,是主断裂带上的一个分支,从小鱼洞经草坝,延伸至向峨,破裂带由北西向逐渐过渡到南西向,全长约6 km。已发现的最大同震位错位于主破裂带的都江堰虹口附近,最大垂直位错4.8 m、最大水平右旋位错4.7 m。本文以南坝镇地震地表破裂点附近的建(构)筑物震害调查为例展开,此段地表垂直位错0.5~2.5 m,水平位错1.3~2.0 m,地表强变形带宽度7.6~18 m;相应地,50 m范围内的房屋完好率为0,倒塌率为0.424,中等破坏与严重破坏率为0.576。沿地表破裂带上的15个乡镇的1699栋建(构)筑物震害表明,在距地表破裂迹线距离为150 m范围内的建筑物的倒塌率逐渐下降,即从0.33193降低到0.29264;在距地表破裂迹线距离为250 m范围内的建筑物的完好率逐渐上升,即从0.08824上升到0.1248;超过这样的区域,倒塌率和完好率趋于平缓。从震害指数角度,可以发现,在距地表破裂迹线距离为150 m范围内的建筑物的震害指数逐渐下降,即从0.72降低到0.47344;超过这样的区域,震害指数规律性不明。
Field investigations of the Ms 8.0 Wenchuan Earthquake show that buildings on the ground surface rupture zone were severely damaged. The surface rupture zone consists of three parts. Two of the parts are respectively along the trace of the Beichuan-Yingxiu fault and the Guanxian-Jiangyou fault. The former part is about 260 km long, which starts at Yingxiu and terminates at Nanba; the latter part is about 50 km long which starts at Tongji and terminates at Jushui. The third part connects the Beichuan-Yingxiu fault and the Guanxian-Jiangyou fault from Xiao Yudong, to Tongji, which is about 6 km long. The maximum vertical and horizontal offset of 4.8 m and 4.7 m, respectively, were observed along the Beichuan-Yingxiu fault, whereas a maximum vertical offset of 3.5 m occurred along the Guanxian- Jiangyou fault. The distribution of damaged buildings along the trace of ground surface was investigated in many segments. The seismic damage distribution in Nanba area will be introduced considering that lots of rural residents live there. Vertical and horizontal offset of 0.5 - 2.5 m and 1.3 - 2.7 m, respectively, were observed along this segment, and the significant width of deformation caused by the offset is 7.6 - 18 m. In this segment, the building of intact ratio is zero, the ratio of medium to the serious damage is 0.576 and the collapse ratio is 0.424 within 50 m. Totally 1699 structures were investigated in 15 segments along the ground surface rupture zone. The collapse ratio decreases from 0.33193 to 0.29264 corresponding to the fault distance 0 to 150 m. Here the fault distance is defined as a distance from location of structure to the trace line of rupture points; the building of intact ratio increases from 0.08824 to 0.12480 corresponding to the fault distance 0 to 250 m. In other way, earthquake damage index of building structure decreases from 0.72 to 0.47344 corresponding to the fault distance 0 to 150 m. There is no significant

强震前近震中区地电场异常研究
Geoelectric Field Ratio Anomalies near Epicenter Area before Earthquakes
 [PDF]

张磊, 田山
Electromagnetic Analysis and Applications (EAA) , 2013, DOI: 10.12677/EAA.2013.21002
Abstract:

对国内地电场观测的分析结果表明,地电场观测资料中存在着各种不规则的扰动变化和多种频谱的周期性变化,这种与地磁场或者固体潮正常变化相关的电场变化和地震前兆变化混杂在一起,很难从原始资料中识别和提取地震前兆信息。考虑到与地震有关的近场变化对地震预测的研究更具实际意义,本文中选取了汶川、玉树地震震源区附近的39个台站和文安地区12个台站的地电场观测资料,通过计算同台、同测向观测资料的长、短极距测值的比值对地震前兆信息进行分析、研究。结果表明,震中区的多数台站地电场的比值震前存在不同形态的异常变化。
The analysis of geoelectric observation in Chinaindicates that geoelectric data contain various irregular changes and multiform spectrum periodic changes. These changes are correlated with normal geomagnetic field or earth tide and mixed with seismic precursor information, which make it difficult to detect and extract seismic precursor information from raw data. Considering that changes in near field are more significant to earthquake prediction, the data from 39 stations near the epicenter area of Wenchuan and Yushu earthquake and 12 near the epicenter area of Wen’an earthquake have been collected in order to calculate the ratio for further research using the long and short dipole distance observation data in the same direction of the same station. The result indicates that most of the stations appear ratio anomaly with different shape before an earthquake in the epicenter area.

汶川8级地震前的水平引潮力极值调制研究
The Discussion of the Horizontal Tidal Force Extreme Modulation before Wenchuan of Province Sichuan Ms8 Earthquake
 [PDF]

顾瑾萍, 李刚, 张小涛
Advances in Geosciences (AG) , 2014, DOI: 10.12677/AG.2014.45041
Abstract:
根据水平引力潮极值条件,通过地震目录资料作极值调制计算,讨论在一定的时间窗内,满足水平引力潮极值条件时所调制的地震活动时空分布。研究这些时空分布特征在震前与2008年5月12日四川汶川8级地震三要素的关联信息。
Based on analysis of the horizontal tidal force extreme condition and the modulation calculation of the seismic catalog data, the time and space distribution character of seismic activity is discussed for micro earthquakes satisfying the condition of the horizontal tidal force extreme modulation. The related information with The Wenchuan Earthquake’s three factors is researched in this paper.
Mulit-source SAR Remote Sensing Data for Rapid Response to Wenchuan Earthquake Damage Assessment
多源雷达遥感数据汶川地震灾情应急监测与评价

SHAO Yun,GONG Hua-ze,WANG Shi-ang,ZHANG Feng-li,TIAN Wei,
邵芸
,宫华泽,王世昂,张风丽,田维

遥感学报 , 2008,
Abstract: SyntheticApertureRadar (SAR) has significantadvantages in disastermonitoring thatare allweather, inde- pendentof illumination mi aging capabilities and strong stereoscopic sense. SAR technology played irreplaceable role in rapid response toWenchuanEarthquakemonitoring and damage assessment. WenchuanEarthquake generated numerousof landslides, landslide lakes and dams, aswellasdebris flows. Theirquantity, scale and dmi ension brake historic records. Landslides buried towns and villages, blocked up river channelswhich inundated villages and heavily destroyed the road networks andmade the rescuework extremely difficult. The hardship ofrescue effortswasbeyond ofhuman mi agination in Wenchuan Earthquake. W ith high resolution SAR mi ageswe detecte a greatdealof landslides and landslide lakes. Those giant catastrophic landslides reach very large size and scale. One of the largest landslideswe detecte has total area of7 km2and fly distance of4 km. They fly from one side of the riverbank to the opposite bank. It ishard to explain theirbe- havior and scalewith ordinary conceptof landslide. Moving such amountofmaterialneeds tremendous energy. DoesWen- chuan Earthquake provide such amountof energy? Why doesWenchuan Earthquake generate somany seismic secondary disasters? Certainly geosciences community needs further research to solve this puzzle. Themicrowave remote sensing division in Institute ofRemote Sensing Applicationsmade 7 reports on Tangjiashan landslide and Landslide Lake, Beichuan countywithmulti-temporalSAR mi ages, 7 reports on other landslides and land- slide lakes, 1 reporton building damage assessment for several counties, includingAnchang town, HuagaiTown, Mianzu City and LuojiangCity. All the reportswere delivered to central and localgovernment, ministries and rescue teams. This paper summaries thework thathas been done forWenchuan Earthquake. This paperpresents the SAR mi age interpretation on building damage assessment, landslide and landslide lakemoni- toring, especially their characteristics on SAR mi ages. The damaged building normally has no clear texture or shadow in contrastwith buildings in good conditions. Owing to the good stereoscopic sense ofSAR mi ages,we can identify the back scar, debris deposit, fly trace and measure the total area and the flying distance of a landslide. W ith continuously ac- quiredmulti-temporalSAR mi ages, including TerraSAR-X and COSMO-SkyMed satellite SAR mi ages,we can track the development of a landslide lake such asTangjiashan LandslideLake. Aswater level rising, the small towns such asXuan Ping, Zhicheng and village ShengKenziare inundated. TheXuan PingTown is finally totalunderwater. Many roads along the Jian Riverare inundated aswel.l The tailofTangjiashanLandslideLake extends toward upstream gradually, andwid- ens the riverchannelobviously. All the information extracted and evaluation delivered from SAR mi agesmade greatcontri- bution to the decisionmaking and rescue action.
Property analysis of cosmic rays before and during the great Wenchuan earthquake
汶川大地震前后的宇宙线强度变化特性分析

王晶,程永宏,叶宗海,刘四清
地球物理学进展 , 2010,
Abstract: Two methods are used to analyze the variations of cosmic rays fluxes of stations at Beijing, Guangzhou, Moscow, Irkutsk and Nagoya before and during the great Wenchuan earthquake on May 12, 2008. Results show that only Beijing cosmic ray data responded to the earthquake in a certain extent. The counting rate increase is 1.15% and 1.31%,respectively, while other stations data did not, which may be the base of using cosmic rays to alarm intense earthquakes.
Estimating the location accuracy of the Beijing Capital Digital Seismograph Network using repeating events
首都圈地区“重复地震”及其在区域地震台网定位精度评价中的应用

JIANG Chang-Sheng,WU Zhong-Liang,LI Yu-Tong,
蒋长胜
,吴忠良,李宇彤

地球物理学报 , 2008,
Abstract: Location capability and its spatial distribution of the Beijing Capital Digital Seismograph Network were estimated using 'repeating earthquakes' or 'earthquake doublets' from 2002 to 2006.Taking the definition of waveform correlation by Schaff and Richards1],it is assumed that the 'repeating events' or 'doublets' are separated by no more than 1km,the network-measured apparent distances of 'doublets' indicates the order of magnitudes of the location error,and the difference of travel times between the 'repeating events' indicates the error of phase picking.Waveforms of 0.5~5.0 Hz band-pass filtered BB/VBB recordings and 1.0~5.0 Hz band-pass filtered SP recordings are cross-correlated,recognizing 859 'repeaters',being 24% of the whole events.It is observed that the average accuracy of the routine location by the Beijing Capital Digital Seismograph Network is of the order of magnitudes of 5km in the northern part where seismic observational condition is better,and of 13km in the south and west part where seismic observational condition is to be improved.
The harm and loss of ecosystem assessment of earthquake disaster in Sichuan Province
地震灾害对四川省区域生态系统危害及损失评价

YU Wen-Jin,
于文金

生态学报 , 2008,
Abstract: 地震是自然灾害中最为严重的一种,其带来的生态破坏灾难巨大,区域生态系统损害估算是目前研究中的难点问题之一。对我国西部地震的生态损失特点进行了研究,系统总结国内外地震灾害的生态系统损失评估成果,提出了西部地震生态损失评估模型:Eq=Ep+ERC+ERL,利用指数分析法和机会成本法等构建了地震研究的基本计算模型和理论,提出用地震生态损失量和地震生态损失灾害度相结合的办法来研究具体区域生态系统的地震灾害损失。利用模型计算,四川省在本次地震中森林碳汇储备能力每年损失78.1万t,损失价值2.5×10^8元,森林释放氧气能力降低67.38万t,损失价值2.7×10^8元。直接生态系统损失(%)647.58×10^8元,生态系统恢复费用(ERC)1158.31×10^8元,全省森林生态系统生态服务价值损失达1055.88×10^8元,综合生态损失在3527.31×10^8元,灾度0.38,属于明显灾害破坏。灾害损失和灾害度的快速评估对于指导灾后生态系统重建工作和生态系统工程的防灾都具有重要的积极作用。
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