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LONG Si-sheng 《地震学报(英文版)》2000,13(5):491-498
Twenty-two earthquakes (M
L=2.2–3.7) in the joint region of Xianshuihe, Longmenshan and An’ninghe faults are studied in this paper. The source mechanism
solutions of these events are obtained using P-wave first motion method, and the characteristics of the source stress field
and rupture in the joint region are summarized preliminarily with some results of other researchers. Being strongly extruded
by the approximately horizontal regional stress with the direction from north-west to south-east and the effect of the complex
tectonics in the region, the source stress field has complex and variable characteristics. The earthquakes mainly show normal
or strike-slip faults in Yajiang, North-triangle and west of Chengdu-block areas, indicating that the vertical forces have
been playing an important role in the source stress fields, while the earthquakes mainly show reverse or strike-slip faults
in Baoxing-Tianquan area, with the horizontal components of the principal pressure stress axes identical to the south-west
direction to which the shallow mass is moving. We think that the manifold combinations of earthquake faults are the micro-mechanism
based upon which the large regional shallow crust mass has been moving continually. 相似文献
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IntroductionSichuan region is one of the extruded and connected parts between the Qinghai-Xizang (Tibet) Plateau and Yangtze block. And the joint region of Xianshuihe, Longmenshan and An(ninghe faults reflects the structure characteristics formed by the Qinghai-Xizang Plateau(s extruding to Yangtze block and the Sichuan basin evolutionary process as fore-land basin. The researches on seismic activity in Sichuan region were mainly around Xianshuihe, Longmenshan and An(ninghe faults separ… 相似文献
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Introduction Hilbert-Huang transform (HHT) is a great break in processing nonlinear and non-stationary data and can be successfully used in many science domains. There are mainly two parts in this method. The first part is to decompose the original data into several intrinsic mode functions (IMF) with the empirical mode decomposition (EMD). IMF components are derived from the original data directly according to the local characteristics in the data under some rules, so that IMF are poste… 相似文献
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LongmenshanfaultzoneislocatedintheeasternedgeofTibetanplateaucollisionbeltdividingChinaintoeastandwestpart.ItisoneofthehighseismicityareasinSichuanProvince.TheDecember8,1998LudingearthquakesequenceofML=3.4occurredinthesouthofLongmenshanfaultzonewithmanyfullobservedrecords.Althoughthemagnitudesofthisearthquakesequencearenotverybig,thegeographiclocationsareveryimportant.BecausetheyarenearbytheintersectingareaofLongmenshanfaultwithXianshuihefaultandXiaojiangfault,wherethestructuresandtheregi… 相似文献
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针对已提出的多签名方案不适用于基于双线性对的身份密码系统的情况,分析了一些特定应用环境对多签名思想和身份密钥系统的有着共同的需求,在Hess等人提出的数字签名方案的基础上,运用Harn等人构造多签名的方法构造出了一个适用于身份密码系统的基于身份和双线性对的多签名方案。并通过相关定理给出方案的正确性和安全性分析。 相似文献
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针对已提出的多签名方案不适用于基于双线性对的身份密码系统的情况,分析了一些特定应用环境对多签名思想和身份密钥系统的有着共同的需求,在Hess等人提出的数字签名方案的基础上,运用Ham等人构造多签名的方法构造出了一个适用于身份密码系统的基于身份和双线性对的多签名方案。并通过相关定理给出方案的正确性和安全性分析。 相似文献
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2003年12月3日7时26分发生道孚4．8级地震，宏观震中在四川省甘孜州道孚县葛卡乡至木茹乡一带，震中烈度为Ⅴ度。这次地震影响到道孚县4个片区(尼措区、瓦日区、扎坝区和八美区)两个镇及十个乡，地震灾害评估区总面积2395平方千米。这次地震未造成人员伤亡和牲畜死亡或丢失；也未造成公路、桥梁、通讯等生命线基础设施损失。房屋未出现倒塌；只出现个别片石砌筑的房屋墙体局部垮塌和轻微裂缝，有个别房屋出现梭瓦和掉瓦。地震所造成的损失程度分为中等、轻微和基本完好三个等级；对道孚县造成的经济损失为85．39万元。 相似文献
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