The seismic hazard assessment of the Dead Sea rift, Jordan   总被引：1，自引：0，他引：1  

Abdallah S. Al-Zoubi  Z.S.H. Abu-Hamatteh  Amrat Abdealkaderer 《Journal of African Earth Sciences》2006,45(4-5):489-501

The Dead Sea fault system and its branching faults represent one of the most tectonically active regions in the Middle East. The aim of this study is to highlight the degree of hazards related to the earthquake activities associated with the Dead Sea rift, in terms of speculating the possible future earthquakes. The present investigation mainly is based on available data and vertical crustal modeling of Jordan and the Dead Sea model for the Dead Sea basin with particular emphasis of the recent earthquake activities, which occurred on December 31st, 2003 (Mc = 3.7), February 11th, 2004 (strongest Mc = 4.9 R), and March 15th, 2004 (Mc = 4). The present research examines the location of the strong events and correlates them with the various tectonic elements in the area. The source mechanism of the main shock and the aftershock events is also examined. The analyses were based on the available short period seismogram data, which was recorded at the Natural Resources Authority of Jordan, Seismological Observatory. The seismic energy appears to have migrated from the south to the north during the period from December 31st up to March 12th, where the released seismic energy showed a migration character to the southern block of the eastern side of the Dead Sea, which led the seismic event to occur on March 15th.  相似文献   

Adoption of the arctic search and rescue agreement: A shift of the arctic regime toward a hard law basis?     

Shih-Ming Kao Nathaniel S. Pearre  Jeremy Firestone 《Marine Policy》2012,36(3):832-838

This paper examines the Arctic Search and Rescue Agreement—the first legally-binding instrument negotiated and adopted under the auspices of the Arctic Council—and analyzes its implications for the current Arctic regime. Led by the Arctic Council, the Arctic regime was established in a soft law format. However, the soft law nature and restricted mandates of the Arctic Council have limited its capacity to respond to new issues emerging from climate change, particularly those related to the exploitation of oil and gas reserves, commercial shipping through the region, effects on wildlife, and impacts on indigenous peoples' homelands and culture. The adoption of the Agreement represents a new approach for the Arctic States to respond to these new challenges. At the same time, it does not imply that a legally-binding instrument is necessarily preferable for every issue, and importantly, the new Arctic Agreement does not establish new institutional relationships, suggesting satisfaction among the Arctic States with the existing arrangements. Thus, although the Arctic regime is undoubtedly changing, this change should not be treated today as a shift from soft to hard law. What is more certain is that the Arctic Council will continue to function as a cooperative forum where the Arctic States can address these challenges, and its importance will only increase in coming years.  相似文献   

地震与核爆识别的小波包分量比方法   总被引：20，自引：5，他引：20  

杨选辉  沈萍  刘希强  郑治真 《地球物理学报》2005,48(1):148-156

频谱分析法在核爆与地震识别中具有广泛的应用．但是频谱分析方法是稳态方法,即使采用Gabor变换,也因时-频窗口形状不变而分辨串较低．为提高时-频分辨率,本文将小波变换理论用于乌鲁木齐台记录的地震与核爆事件的分析,并提出了识别核爆和天然地震的小波包分量比判据．通过对加拿大黄刀地震台记录的印度地下核爆的分析,进一步验证了小波包分量比判据对核爆和地震的识别具有较高的识别效率．结果表明：对于地震信号,其小波包分量比U03/U1一般都大于1.0,而对于核爆信号,比值U03／U13一般都小于1.0.  相似文献   

新疆天山地区地下流体地震前兆研究的现状与发展前景   总被引：6，自引：8，他引：6  

王道 《内陆地震》1995,9(2):137-149

系统地介绍了新疆天山重点震监视区下流体观测网,及其地质构造环境和地下水的成因类型,总结了２０年来地下流体地震前兆探索与地震前兆探索与地震预报研究的基本经验和成果。  相似文献   

大深度救生钟耐压结构的优化设计     

苗兰森  胡勇  沈允生 《海洋技术学报》2011,30(1):95-98,117

针对某型救生钟的救生舱耐压壳体,推导出典型水下耐压结构的计算公式,建立结构优化数学模型,并编制计算程序以求解结构最优尺寸,在此基础上确定耐压结构的设计尺寸.对设计结果采用有限元计算和规范计算比对分析,结果证明采用程序计算设计的优化尺寸满足工程要求.本文提供的计算方法可为水下环肋耐压壳体结构工程设计提供参考.  相似文献   

正常震群和前兆震群的判定指标     

闻满华  刘祖荫 《地震研究》1994,17(1):31-39

本文采用大森公式ｎ（ｔ）＝Ｋ／（ｔ＋ｃ）＾ｐ求解Ｋ、ｃ、ｐ三个参数，对云南１９６５年以来７１个地震序列进行研究。确定Ｐ＝０．８为前兆震群和正常震群的判定指标。利用Ｋ、ｃ、ｐ三参数计算序列理论曲线得到晚期强余震前差残曲线超出两倍均方差的结果。  相似文献   

    

L. Luzi  F. Pergalani   《Soil Dynamics and Earthquake Engineering》2000,20(5-8):301-313

After the occurrence of the 26 September 1997 earthquake in Umbria–Marche an extensive survey was performed to individuate surface effects induced by the ground motion. Several types of effects occurred on bedrock, calcareous debris and sandy-clay deposits. Shallow soil slides and dry debris slides were mapped by field survey and aerial photograph interpretation in the epicentral area close to Nocera Umbra. This gave the opportunity for testing the prediction maps that can be obtained with the use of empirical laws, proposed by several authors, based on a simple method (Geotechnique 15(2) (1965) 139). Accelerometric records from the permanent and mobile seismic network of the Seismic Survey of Italy have been processed and interpolated to obtain strong ground motion parameters at each site, e.g. Peak Ground Acceleration, Spectral Intensity, Arias Intensity, etc. The different predictions have been tested with the real landslide data to verify their performances. Some of the proposed methods explain quite well the behaviour of slopes during the application of a time history and can therefore be employed for future landslide hazard zonation.  相似文献   

Evaluation of seismic ground motion induced by topographic irregularity   总被引：1，自引：0，他引：1  

Khoa-Van Nguyen  Behrouz Gatmiri   《Soil Dynamics and Earthquake Engineering》2007,27(2):183-188

Results of an extensive numerical study on the 2D scattering of seismic waves by local topography are presented. The investigation has been conducted using the direct boundary element method. Several types of topography (slopes, canyons and ridges) are considered. The influences of some key parameters, such as exciting frequency and geometry of the irregular feature, on surface ground motion are studied in detail. It is found that local topographic conditions play an important role in the modification of seismic ground motion at the irregular feature itself and its neighbourhood. The present results can be considered to be useful from the viewpoint of earthquake engineering and seismology.  相似文献   

3G智能手机在地震监测预报工作中的应用     

薛志文 《山西地震》2012,(4):16-19

结合3G智能手机小巧易携带、可随时随地上网,配备先进的软硬件系统,可根据需要开发、安装应用软件,功能越来越强大等优点,以中兴U880为例,介绍3G智能手机存地震监测预报工作中的实际应用。  相似文献   

    

T. Kokusho  T. Ishizawa 《Soil Dynamics and Earthquake Engineering》2006,26(2-4):221-230

Earthquake-induced slope stability is evaluated by the force-equilibrium method in engineering practice. This method provides a safety factor against initiating failure or displacement according to the Newmark model along a fixed slip surface but it cannot evaluate failure deformations after failure occurs. An energy approach is proposed as an alternative means for evaluating slope failures and subsequent flow deformations. The driving energy for slope displacement is considered to be the earthquake energy and the gravitational potential energy. As a first step in the research, an energy balance is formulated for the model of a rigid block resting on an inclined plane. Then, an innovative model test is developed, in which the energy balance in a sliding slope is measured on a shake table. The earthquake energy used for the slope failure can be successfully quantified in the test and its contribution to displacement is discussed in the light of the energy balance established for the block model.  相似文献