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31.
Research on Tectonic Features and Dynamics in the Northwestern Yunnan Extensional Region 总被引：2，自引：0，他引：2
Han Zhujun Xu Jie Guo Shunming Yang Zhu'en Xiang Hongfa and Wu DaningInstitute of Geology SSB Beijing China 《中国地震研究》1995,(2)
The paper discusses the features of active tectonics,seismicity and neotectonic environment in the Northwestern Yunnan extensional region.The intensity of both tectonic activity and seismicity is strong near the south and north boundaries in the areas,but weak in the middle.The distribution of the strongest subsided areas,lacustrine terrace and Quaternary fold is characterized by the diagonal symmetry.Formation of extensional tectonics in the Northwestern Yunnan can be explained by passive model,experiencing the action of compressional force in the N-S direction and shear force in the SW-NE direction,and classified as a special pull-apart tectonics.The direction of the composite force is NNE,which is coincided with the results acquired by the methods of water-compressed rupture and physical modelling. 相似文献
32.
Li Yanxing Shen Jianhua and Wang MinFirst Crustal Deformation Monitoring Center SSB Tianjin ChinaDepartment of Scientific Programming Earthquake Monitoring SSB. Beijing China 《中国地震研究》1995,(3)
The Global Positioning System (GPS) is a new method to monitor the crustal deformation for earthquake prediction.Now a four-dimensional crustal deformation monitoring network applying GPS techniques has been established in North China,which is an important seismic monitoring area.Results with high precision have been achieved in the first measurement since a series of advanced methods and measures were adopted,and thus a good foundation has been laid for future researches on earthquake prediction and geodynamics. 相似文献
33.
Evaluation of Earthquake Losses and Establishment of a Corresponding Database System 总被引：1，自引：0，他引：1
After the Datong-Yanggao earthquake (October 1989),a special team was organized for the first time by the SSB of China to start the work of earthquake damage evaluation for the purpose of providing the government with a scientific basis for disaster relief.The result of the evaluation played an important role in speeding up rehabilitation and reducing damage losses in the earthquake area.Based on the evaluation of earthquake damage from the Datong-Yanggao earthquake and recent research results,this paper presents a method for quick evaluation of earthquake damages,introduces software entitled EDEP (earthquake damage evaluation program) for evaluating earthquake damage,and cites a case to explain the main function and application of the EDEP.Finally,for a quicker evaluation of earthquake damages,the paper also proposes the establishment of database systems of earthquake damage evaluation in the emphatically monitored areas and ways to build up such database systems. 相似文献
34.
In this paper the authors have discussed the results of investigation of fine velocity structure in the basement layer of the Simao-Zhongdian DSS profile in western Yunnan region.The depth of upper Pz interface of the basement layer is about 0-3.5 km,and the depth of the lower P1 interface is 11.0-17.0 km.The velocity of the basement layer on the southern side of the Jinhe-Erhai deep fault is 5.70-6.30 km/s,and has increased to 6.30-6.50 km/s on the northern side.Their transitional zone is situated near Jianchuan County.Along the profile some localities,where the faults cut across the lateral variation of Pz interface velocity,are quite obvious in addition to the variation in depth.The velocity isopleths are relatively sparse in the southern region of JYQ S.P.(shot - point),near the DC S.P.,and in the south ZT S.P.The magma has apparently risen up along the deep faults to the upper crust in these localities,forming a large intrusive rock zone in the basement layer.In Jinggu region the basaltic magma has 相似文献
35.
The study of the netlike earthquake distribution indicates that in the central-eastern part of Asia continent there are two network systems: the central-eastern Asia system and the southeastern China system.As interpreted by the multilayer tectonic model,they might be a manifestation of the plastic-flow network systems in the lower lithosphere,including the lower crust and the mantle lid.Each network system is enclosed by different types of boundaries,including one driving boundary and some constraining and releasing boundaries.The two plastic-flow network systems with the Himalayan and Taiwan arcs as their driving boundaries play the role of controlling the intraplate tectonic deformation,stress field,seismicity,and subdivision of tectonic units. 相似文献
36.
To determine the locked and slip parts on a fault,we simulated the movement pattern of the fault with a combined model consisting of a negative dislocation in the locked area superimposed on a relative movement between two sides of the fault.In this way,we determined the locked parts of faults by inversion with multiple epochs of geodetic data.In this paper,we have determined the movement patterns of four main faults in western Yunnan by inversion with two epochs of geodetic surveys and some crossing-fault observations.From the inversion result,we have identified the areas around Dali and Xiangyun to be the locked area,which is regarded as a sign of potential earthquake sources. 相似文献
37.
新疆准噶尔二台地区晚古生代古极点位置与塔里木、哈萨克斯坦地块同时代极点位置无显著差别。实测古纬度更接近于用哈萨克斯坦极点计算得到的预期古纬度。因此,晚古生代准噶尔地块与哈萨克斯坦地块已是统一的整体。泥盆纪准噶尔地块内的准噶尔洋盆于晚石炭世闭合于乌伦古河一带。西伯利亚板块、塔里木、哈萨克斯坦地块等组成东部劳亚大陆的块体,尽管其运动演化有所差异,但都遵循了以西伯利亚板块为主体大致相同的总的运动演化过程,即晚古生代至中生代早期,由低纬度向高纬度的NW向运动和侏罗纪以来的SEE向运动 相似文献
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39.
水震波异常与中期强震危险性关系初探 总被引：3，自引：0，他引：3
近年来在我国井网中发现某些强震之前井水位记震特性的异常现象。本文根据理论分析、试验研究与井网中统计结果提出水震波异常与区域应力状态的变化之间可能存在着一定关系,然后广泛收集了华北地区15口井水位1985—1991年间的水震波资料并系统分析了1989年10月19日大同—阳高M_s6.1地震前后井水位记震特性的变化,确认强震前存在着水震波异常。 相似文献
40.
Inversion of the Strain Accumulation State in Crustal Interior from Observations of Earth Tide Tilts
The strain accumulation state in crustal interior and its migration trend can be inverted from observational data of earth tide tilts.In China,large earthquakes frequently occur in the border area between Yunnan and Sichuan Provinces.Using the observational data for years from 7 stations in this area,γ(the amplitude factor of earth tide tilts)values that characterize the strain accumulation state in crustal interior have been inverted in this paper.It has been found out that,Ms>5 events in the area often occur when γreaches an anomaly value.Using the time-space collocational stereomodelling the migration trend of strain accumulation can be determined to make a prediction for the probable location of a forthcoming earthquake in the area. 相似文献