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1.
Zhang Yongjiu 《中国地震研究》2006,20(4):396-405
INTRODUCTIONAn earthquake ofML5·0 occurredin Barkamcounty,Aba Prefecture ,Sichuan Province onJan.1 ,2005 ,and was located at the northwest of the Songganfault ,an area betweenthe Songgangfault ,Yukefault , Darlag fault and Madoi-Gad毢fault . TheML5·0 earthquake is the biggest one in AbaPrefecture since theM6·6 Xiaojinearthquake of 1989 and alsothe biggest oneinthe area betweentheSonggangfault ,Yuke fault ,Darlagfault and Madoi-Gad毢fault since Nov.8 ,1970·Since the commencem… 相似文献
2.
《中国地震研究》1994,(2)
Based on the analysis of the three current seismic intensity scales,the authors maintain that there are still some shortcomings in the present seismic intensity evaluation and propose a method which takes the damage rate of structures such as houses to determine the seismic intensity.Also,it is pointed out that the proposed method is favorable to the combination of seismic investigation,seismic damage forecast and hazard reduction counter-measures. 相似文献
3.
Potential sources are aggregates of probable future epicenters.In this area,for source models currently,in common use for seismic risk analysis in China,the mean area of each potential source is about 3000-4000 km2.It is assumed that seismic risk has a uniform distribution within the range of each potential source,but studies have shown that the uniform distribution model to a large extent may give an underestimation of the seismic risk.In this paper,the relative distribution of historical epicenters in space within potential sources is discussed,a method is proposed to quantitatively describe the non-uniform distribution of strong earthquakes within potential sources,and some preliminary results are given.By using the results of this paper,seismic risk analysis and seismic zonation can be made more scientific and more reasonable. 相似文献
4.
Li Shicheng 《中国地震研究》2004,18(1):79-87
This research on the attenuation features of intensity in the Yunnan region has been conducted by using intensity isoseismals of 127 earthquakes, and the following three conclusions have been put forward : ( 1 ) The average ratio value of long axis to short axis of innermost isoseismals in the Yunnan region is larger than that of eastern China and smaller than that of western China.The velocity of intensity attenuation varies in different directions; (2) The zoning feature of intensity attenuation in the Yunnan region is obvious; (3) In Northwest China and North China, the ratios of long axis to short axis of low-magnitude isoseismals are larger than those of high magnitude ones. Compared with that phenomenon, the ratios in the Yunnan region are more complicated. Finally, some relevant questions are discussed. 相似文献
5.
26 earthquakes with MS ≥5. 0 have been recorded in the northeast margin of the Qinghai- Xizang (Tibet) block since 1980,22 of which were relatively independent of other moderate- strong earthquakes. Research on the increase of small earthquake activity before the 22 moderate-strong earthquakes has indicated that small earthquake activity was enhanced before 17 of the moderate-strong earthquakes. Though the increased seismicity is a common phenomenon in the northeast margin of the Qinghai-Xizang ( Tibet ) block,we have difficulty in predicting the moderate-strong earthquakes by this phenomenon. In order to predict the moderate-strong earthquakes through the increased seismicity of small earthquakes,this paper attempts to propose a new method, which calculates small earthquake frequency through the change of distribution pattern of small earthquakes, based on the characteristics of small earthquake activity in the northeastern Qinghai-Xizang (Tibet) block,and then make primary applications. The result shows that we are able to obtain obvious anomalies in the frequency of small earthquakes before moderate strong earthquakes through the new method,with little spatial range effect on the amplitude of this small earthquake frequency anomaly. We can obtain mid to short-term anomaly indices for moderate-strong earthquakes in the northeast margin of the Qinghai-Xizang (Tibet) block. 相似文献
6.
By systematically analyzing the data of gravity reiteration in the Hexi region and taking a dynamic viewpoint.we have studied the evolution characters of gravity field during the preparation-occurrence of the Jingtai Ms5.9 earthquake of June 6,2000,The patterns of dynamic change of the gravity field clearly reflected how the gravity field evolved from the quasi-homogeneous state to non-homogeneous state for earthquake preparation and then the earthquake occurred.Besides,we have also studied the relation between the characteristic gravity change and strong earthquake activity. 相似文献
7.
In this paper,three problems are studied and their results are presented as follows:(1)classification of seismic vulnerability for existing buildings,(2)dynamic earthquake damage matrix analysis method of buildings,and(3)earthquake damage matrix of building in the year 2000. 相似文献
8.
Wang Qiong 《中国地震研究》2007,21(3):255-268
The Bachu-Jiashi earthquake of Ms6.8 occurred on February 24, 2003, about 20km from the southeast of the 1997 - 1998 Jiashi seismic region in Xinjiang, and its aftershocks are rich and strong. Did the 1997 - 1998 Jiashi strong earthquake swarm trigger the Bachu-Jiashi Ms6.8 earthquake？ The Atushi earthquake of Ms6.7 occurred in 1996, and the 1997 - 1998 Jiashi strong earthquake swarm occurred about 70km from the Atushi earthquake 10 months later. Did the Atushi earthquake of Ms6.7 encourage the 1997 - 1998 Jiashi strong earthquake swarm？ There were 9 earthquakes with Ms6.0 from 1996 to 1997 in the Jiashi seismic region, how did they act on each other？ To answer the above questions, the article studies the triggering effect of the activity process of the whole Jiashi earthquake swarm from the 1996 Atushi earthquake of Ms6.7, the 1997 - 1998 Jiashi strong swarm to the 2003 Bachu-Jiashi earthquake of Ms6.8, and analyzes the seismicity characteristics around the Jiashi region. The results show that the 1996 Atushi earthquake of Ms6.7 encouraged the 1997 - 1998 Jiashi strong swarm to some extent, the accumulative Coulomb stress change from the previous M6.0 earthquakes of the Jiashi strong swarm had certain triggering effects on the following M6.0 events, and the Coulomb stress change converted from the Jiashi strong swarm strongly encouraged the 2003 Bachu-Jiashi earthquake with Ms6.8. 相似文献
9.
Ping Jianjun 《中国地震研究》2004,18(2):188-199
Based on the extraction and calculation of the short-term seismic precursory information magnitude from the 114 major precursory observations in the North China region, and together with consideration of factors such as geological structure, seismicity, crustal thickness, and in particular, the current geodynamics of the region, the authors studied the time-space evolutionchara cteristics of the short-term earthquake precursory information magnitude and its relationship with earthquakes and proposed the index and method for the short-term synthetic prediction of earthquakes with Ms ≥ 5.0 in the North China region. The inspection through Rvidue shows that the method is effective to a effective to a certain extent for earthquake prediction. 相似文献
10.
Wang Xinling 《中国地震研究》2006,20(1):37-49
INTRODUCTIONEarthquake sequence is a series of centralized earthquake events in space-time after a largerearthquake.Since these earthquake events occur in a small space and are sequential in one specialtime,their seismogenic structure,mediumcharacteristics and earthquake mechanisms must be similar.By studying one earthquake sequence,the seismic activitytrend after a large earthquake can beconjectured.Some characteristics of the earthquake source development process and physic states canal… 相似文献
11.
2015年4月25日在尼泊尔廓尔喀县发生的8.1级地震及后续强烈余震,造成尼泊尔北部严重的人员伤亡和财产损失,灾区建筑物倒塌损失严重。本文利用现场震害调查资料和高分卫星遥感影像,开展建筑物震害遥感解译,得到各个遥感解译点的遥感震害指数,结合现场调查点评估的烈度拟合了遥感震害指数-实际震害指数转换关系,再根据遥感震害指数估计了全部解译点的震害指数及地震烈度。估计的烈度与现场调查结果对比显示出较好的一致性,研究结果为该地区今后发生地震提供了可借鉴的遥感评估震害指数转换模型。 相似文献
12.
基于无人机影像的九寨沟地震建筑物震害定量评估 总被引：1，自引：0，他引：1
利用2017年8月8日九寨沟7.0级地震震后获取的无人机影像,结合地面震害调查资料,分析各类建筑物震害特征,建立建筑物震害无人机遥感解译标志;选取地震灾区漳扎镇(部分区域)和荷叶寨2个区域作为研究区,进行了无人机遥感建筑物震害提取,基于遥感震害指数进行了震害定量评估,并与现场建筑物震害调查统计结果进行了比较验证。结果显示,遥感解译建筑物震害与实际震害程度相吻合,表明利用震后快速获取的高分辨率无人机影像,可以较为准确地识别建筑物震害,进而为地震灾害定量评估和应急救援辅助决策提供重要参考。 相似文献
13.
汶川8.0级地震震害遥感定量化初步研究以都江堰城区破坏为例 总被引：8，自引：1，他引：7
随着遥感技术的飞速发展, 遥感在地震应急救援、 灾害调查和损失评估中的作用越来越显著。 然而由于缺乏系统的遥感震害定量研究, 使得遥感的实用性常常受到质疑。 文中叙述了遥感震害定量研究的基本思路, 提出了遥感震害指数的概念与定量分析的基本模型, 并以2008年汶川8.0级地震造成的都江堰城区震害为例, 依据建筑物震害遥感解译结果和地面震害调查结果, 进行了都江堰城区部分街区的建筑物遥感震害指数和地面调查震害指数的统计分析, 并建立了两者之间的统计关系。 初步研究结果表明, 依据高分辨率航空遥感影像和卫星雷达图像建立的建筑物遥感震害指数与地面调查震害指数及房屋倒塌率存在显著的对应性。 因此, 通过遥感震害定量化研究, 将为地震震害调查、 损失评估提供有力的方法和工具。 相似文献
14.
The fast processing, seismic damage data extraction and loss evaluation from RS imagery acquired immediately after a destructive earthquake occurs, are important means for compen-sating the insufficiency of seismic damage information from ground-based investigations and provide an important basis for emergency command and rescue. The paper introduces the method of emergency seismic damage assessment using remote sensing data and its application to the great Wenchuan earthquake of magnitude 8.0 occurring in southwest Sichuan Province on May 12, 2008. The practical effectiveness of the method is also evaluated in the paper. 相似文献
15.
2013年4月20日四川芦山MS7.0级地震发生后,在灾区应急获取了多种高分辨率航空和无人机遥感影像,并快速解译提取了灾区建筑物震害信息.采用地震烈度遥感定量评估方法,利用2008年汶川8.0级地震等震后震害遥感解译和现场调查研究确定的经验震害遥感定量评估模型,获得了芦山地震灾区126个主要居民点的地震烈度遥感评估结果,并据此圈画了地震烈度分布遥感评估图.结果显示,本次地震Ⅸ度区面积约150km2,Ⅷ度区面积约900km2.该结果在第一时间(4月21日晚)提供给了中国地震局地震现场应急指挥部.对比分析显示,地震烈度遥感快速评估结果与中国地震局4月25日公布的地震烈度图,以及与笔者在现场实地进行的建筑物震害详细调查结果基础上评定的地震烈度具有较高的一致性.表明强烈地震发生后,借助于快速获取的灾区高分辨率遥感影像,可以快速估计地震烈度分布,对地震灾区灾情估计和抗震救灾工作具有十分重要的参考意义. 相似文献
16.
强地震发生后, 道路是抗震救灾的生命线, 快速有效地提供灾区可通行道路的状况可为地震应急救援力量的部署提供强有力的信息支撑。 基于遥感图像的震害道路识别是遥感地震应急领域中的难点, 但对于地震应急具有无可比拟的价值。 在总结分析地震前后道路影像特征的基础上, 系统地介绍了遥感影像道路提取方法, 之后介绍了遥感震害道路评估工作流程, 重点阐述了遥感震害道路提取与评估方法, 然后综合分析了遥感道路提取在地震应急中的不足, 最后展望了未来遥感技术在震害道路提取与评估中的应用。 相似文献
17.
房屋建筑数据是地震重点危险区预评估工作的基础,需基于获取到的房屋建筑信息开展人员伤亡、经济损失、救援物资需求等预评估工作。历年地震重点危险区预评估工作能够通过现场调查得到的房屋建筑信息占比极小,仅能进行抽样调查。因此,为批量完成危险区内全部房屋建筑损失估算,需基于遥感影像获取房屋建筑矢量数据,并建立数据库。为实现全国地震重点危险区预评估工作中大批量建筑物矢量化数据的快速获取,本文采用基于遥感影像的建筑物空间分布数据批量获取方法,得到地震重点危险区内建筑物空间矢量数据,结合现场抽样调查得到的建筑物属性信息,建立地震重点危险区建筑物空间分布数据库,进而为地震重点危险区灾害损失预评估工作提供数据基础。本文采用的方法可广泛应用于地震重点危险区房屋建筑信息获取工作中,可提高工作效率,降低工作成本,提升预评估工作的科学性和准确性。 相似文献
18.
高光谱遥感技术在建 (构) 筑物震害识别中的应用 总被引：1，自引：1，他引：0
高光谱遥感作为20世纪空间对地观测技术重大进步的产物,通过其较高的光谱分辨率,为人们提供了丰富的地球表面信息,在各个研究领域得到了快速发展和广泛应用,并取得了卓越的成果。尽管高光谱遥感具有独特的优势,但是针对其在震害评估领域中应用的相关研究较少。本文在总结高光谱遥感的特征、优势及不同领域应用现状的基础上,开展了其在震害评估领域的应用研究。基于ASD地物波谱仪获取的建（构）筑物光谱曲线构建可用于震害分析所需的光谱特征库,对比光谱库中地物曲线之间的差异后,发现高光谱遥感在震害评估领域中的应用是可行的,因不同震害地物之间的光谱特征曲线存在差异,依据这种差异可区分不同的震害信息,从而对震害遥感图像进行精细分类。 相似文献
19.