Monitoring tectonic movements in the Simitli Graben, SW Bulgaria     

《Engineering Geology》2000,57(3-4):179-192

Long-term in situ monitoring of slow tectonic movements has been applied to a seismoactive region of SW Bulgaria, within the epicentral zone of one of the strongest earthquakes in Europe (4 April 1904, M=7.8). The region has been found the most seismoactive in Bulgaria being of interest to many scientists. Three spatial extensometers were installed here in carefully selected sites to reflect fault movements on fissures. The extensometer TM-71 used here, enables three-dimensional detecting of even very slow movements with the accuracy of 0.01 mm and high stability over time. After 17 years of measuring, the rates of tectonic movements were established at all three monitoring points. Movements recorded at point B6 located in the seismoactive Kroupnik fault zone are of a relatively high rate. Locally, they show left-lateral strike–slips at rates of ca. 2.7 mm year⁻¹, as well as thrusting with a mean rate of 1.9 mm year⁻¹. Monitoring point K7 located in a fissure of the same zone on a steep slope affected by recent earthquakes has shown an uplift tendency of the block W of the Strouma Fault, with a result of gradual slope subsidence occurring from time to time. Monitoring point K5 located in a fissure of Strouma Fault zone became increasingly active during the last 2 years after 8 years of relative quiescence. Before that, only low left-lateral movements could be observed. Long-term fissure monitoring has shown quite a number of details interpretable to the dynamics of a broad region. Permanent shear displacements were found to develop after earthquakes. It was established that only a certain distinct part of local earthquakes provide such a displacement reaction at the monitoring points showing particular seismic connections.  相似文献   

韧性剪切带位移量统计方法评述——以西秦岭元家坪韧性剪切带为例     

赵仁夫  何芳  丁仨平 《甘肃地质》2000,(2)

韧性剪切带位移量的计算方法较多 ,每一种方法都有它适用的范围 ,应根据区域地质特点选择适宜的方法进行计算。在对元家坪韧性剪切带位移量的计算中 ,对其方法进行了比较 ,认为应用多种方法计算及验证 ,能得出较准确的位移量。  相似文献   

岩石块体滑动的界面摩擦阻抗时效研究     

左红伟 《工程地质学报》2000,8(2):154-159

基于岩石块体摩擦滑动试验反映的特征规律 ,本文分析了岩块随时间滑动的界面阻抗机理 ,并建立粘滑位移弱化时反映滑动界面阻抗时间效应的模型公式阻抗松弛模型。  相似文献   

凉山活动构造带晚新生代变形特征与位移规模   总被引：17，自引：4，他引：13       下载免费PDF全文

申旭辉  陈正位  许任德  张宁 《地震地质》2000,22(3):232-238

凉山近南北向活动构造带位于青藏高原东南边缘鲜水河 -安宁河 -则木河 -小江断裂带中段东侧 ,与鲜水河断裂带左阶雁列 ,与小江断裂带右阶雁列。大体呈南北或北北西方向展布的凉山构造带 ,自北而南主要包括普雄河断裂、布拖断裂和四开 -交际河断裂。晚新生代以来的活动 ,凉山南北向构造带以明显的左旋走滑为特征 ,相应的倾滑位移分量不大。初步统计得到其晚第四纪以来的走滑速率为 2mm/a左右 ,晚新生代以来位移规模 13.5～ 15.5km。凉山活动构造带的活动 ,弥补了鲜水河 -安宁河 -则木河 -小江断裂带中段安宁河 -则木河断裂带活动存在的位移和速率亏损 ,对于全面评价青藏高原东南边缘的地壳运动和变形模型具有重要意义  相似文献   

类软土滑坡滑动带的确定   总被引：2，自引：1，他引：1  

朱宝龙  胡厚田  张玉芳  陈强  张胜文 《工程地质学报》2006,14(1):28-34

类软土是一种特殊意义上的软土,它与一般沉积软土比较,在形成原因、分布范围、物质组成等其他特性上有区别;由其构成的类软土滑坡则具有普通滑坡不具有的特征。以京珠高速粤南段K108类滑坡为例,介绍了滑坡的地层岩性、构造特征、水文地质特征;应用位移监测方法查明滑坡有五层滑动带,滑面成近于圆弧形的勺形,并对滑坡的产生原因及滑动过程进行了分析,得出降雨和边坡的开挖是导致滑坡的直接诱因。  相似文献   

Source parameters of the M_L 4.1 earthquake of November 08, 2006, southeast Beni-Suef, northern Egypt     

A. Badawy  A.K. Abdel-Fattah  Sh. M. Ali  W. Farid 《Journal of African Earth Sciences》2008,51(3):151-159

In the early morning hours on Wednesday November 08, 2006 at 04:32:10(GMT) a small earthquake of M_L 4.1 has occurred at southeast Beni-Suef, approximately 160 km SEE of Cairo, northern Egypt. The quake has been felt as far as Cairo and its surroundings while no casualties were reported. The instrumental epicentre is located at 28.57°N and 31.55°E. Seismic moment is 1.76 E14 Nm, corresponding to a moment magnitude M_w 3.5. Following a Brune model, the source radius is 0.3 km with an average dislocation of 1.8 cm and a 2.4 MPa stress drop. The source mechanism from a first motion fault plane solution shows a left-lateral strike-slip mechanism with a minor dip-slip component along fault NNW striking at 161°, dipping 52° to the west and rake −5°. Trend and plunging of the maximum and minimum principle axes P/T are 125°, 28°, 21°, and 23°, respectively. A comparison with the mechanism of the October, 1999 event shows similarities in faulting type and orientation of nodal planes.Eight small earthquakes (3.0  M_L < 5.0) were also recorded by the Egyptian National Seismological Network (ENSN) from the same region. We estimate the source parameters and fault mechanism solutions (FMS) for these earthquakes using displacement spectra and P-wave polarities, respectively. The obtained source parameters including seismic moments of 4.9 × 10¹²–5.04 × 10¹⁵ Nm, stress drops of 0.2–4.9 MPa and relative displacement of 0.1–9.1 cm. The azimuths of T-axes determined from FMS are oriented in NNE–SSW direction. This direction is consistent with the present-day stress field in Egypt and the last phase of stress field changes in the Late Pleistocene, as well as with recent GPS measurements.  相似文献   

军交图数据库支持下的线划要素的自动移位     

武芳  王家辉 《测绘学报》1992,21(4):291-298

  相似文献   

用FFT和现代控制论方法恢复地面位移   总被引：3，自引：1，他引：3       下载免费PDF全文

李鸿吉 《地球物理学报》1992,15(1):37-43

直接使用FFT由数字地震记录来恢复地面位移可能产生包括虚假的长周期分量在内的不正确结果.本文介绍了根据FFT和现代控制论所建立起来的迭代方法.对FFT和所介绍的迭代方法所给出的恢复结果进行比较表明,本文所提出的方法确实改善了地面位移的估计.  相似文献   

军事交通图数据库支持下的自动制图综合研究     

武芳 《测绘学院学报》1991,(2)

本文以1:50万军事交通图数据库为基础,探讨并研究了数据库支持下的自动制图综合的理论,方法和实施过程:重点研究了地图内容的选取、线状要素的化简和重迭要素的移位问题;尤其是对图形要素的移位,做了较为详细的分析,提出了检查线状要素之间图形重迭的方法及自动移位的具体措施,并给出了用于程序运行的一些详细算法。  相似文献   

Stone mobility and longshore transport at reshaping breakwaters     

Alberto Lamberti  Giuseppe R. Tomasicchio   《Coastal Engineering》1997,29(3-4)

Physical model tests have been performed in two different wave flumes to analyse the threshold of stone movement and quantify the frequency and length of displacements due to head-on wave attacks at a reshaping breakwater. Data on stone movements were obtained from the observation of cumulative displacements at the end of each wave attack and from video records during the attack. Threshold conditions, frequency of movement and displacement length are expressed as function of a suitably modified stability number.A simple model is defined relating longshore transport due to oblique wave attack to stone mobility. The transport model is based on the assumption that movement statistics is affected by obliquity only through the appropriate mobility index and that stones move during up- and down-rush in the direction of incident and reflected waves. Without any calibration, results compare favourably with experimental data available in literature in the range of low mobility conditions where movement statistics was observed. A calibration is provided in order to obtain an accurate transport formula valid in a wide mobility range i.e. for reshaping breakwaters and up to gravel beaches.  相似文献