Numerical Simulation on Coseismic Effect of the November 14,2001 Great Kunlun Earthquake,Northern Tibet,China

The November 14, 2001 Ms8.1 Kunlun Mountains earthquake in northern Tibet is the largest earthquake occurring on the Chinese mainland since 1950. We apply a three-dimensional （3-D） finite element numerical procedure to model the coseismic displacement and stress fields of the earthquake based on field investigations. We then further investigate the stress interaction between the Ms8.1 earthquake and the intensive aftershocks. Our primary calculation shows that the coseismic displacement field is centralized around the east Kunlun fault zone. And the attenuation of coseismic displacements on the south side of Kunlun fault zone is larger than that on the north side. The calculated coseismic stress field also indicates that the calculated maximal shear stress field is centralized around the east Kunlun fault zone; the directions of the coseismic major principal stress are opposite to that of the background crustal stress field of the Qinghai-Xizang （Tibet） Plateau. It indicates that the earthquake relaxes the crustal stress state in the Qinghai-Xizang （Tibet） Plateau. Finally, we study the stress interaction between Ms8.1 earthquake and its intensive aftershocks. The calculated Coulomb stress changes of the Ms8.1 great earthquake are in favor of triggering 4 aftershocks.     

Dynamic simulation of interactions between major earthquakes on the Xianshuihe fault zone

The authors firstly evaluate the strain accumulation rate of the Xianshuihe fault zone based on earth- quake activity. We calculated the stress and seismic moment accumulation rate for each subsection of the Xianshuihe fault zone based on the distribution of geological slip rate and GPS survey results. According to the results, we get the recurrence intervals of characterized earthquakes on each sub- section respectively. A three-dimensional finite element model for western Sichuan is constructed to discuss the earthquakes triggering among major earthquakes (M>6.7) that occurred along the Xianshuihe fault zone since 1893. The calculated Coulomb failure stress changes (ΔCFS) show that 5 of the 6 earthquakes with Ms>6.7 were triggered by positive ΔCFS. The interactions between major earthquakes not only influence recurrence intervals of characterized earthquakes on each subsection, but also change recurrence behavior of major earthquakes along the whole fault zone.     

“十五”宁夏区域前兆台网建设与系统集成

概述了“十五”宁夏前兆项目系统运行平台及软硬件配置情况。详细地论述了省级区域前兆台网的构架特点,及部署过程中的关键技术与解决方法。     

Spectral element analysis on the characteristics of seismic wave propagation triggered by Wenchuan <Emphasis Type="Italic">M</Emphasis><Subscript>s</Subscript>8.0 earthquake

The 2008 Wenchuan earthquake occurred in an active earthquake zone, i.e., Longmenshan tectonic zone. Seismic waves triggered by this earthquake can be used to explore the characteristics of the fault rupture process and the hierarchical structure of the Earth’s interior. We employ spectral element method incorporated with large-scale parallel computing technology, to investigate the characteristics of seismic wave propagation excited by Wenchuan earthquake. We calculate synthetic seismograms with one-point source model and three-point source model respectively. The AK135 model is employed as a prototype of our numerical global Earth model. The Earth’s ellipticity, Earth’s medium attenuation, and topography data are taken into consideration. These wave propagation processes are simulated by solving three-dimensional elastic wave governing equations. Three-dimensional visualization of our numerical results displays the profile of the seismic wave propagation. The three-point source, which is proposed from the latest investigations through field observation and reverse estimation, can better demonstrate the spatial and temporal characteristics of the source rupture process than the one-point source. We take comparison of synthetic seismograms with observational data recorded at 16 observatory stations. Primary results show that the synthetic seismograms calculated from three-point source agree well with the observations. This can further reveal that the source rupture process of Wenchuan earthquake is a multi-rupture process, which is composed by at least three or more stages of rupture processes. Supported by National Basic Research Program of China (Grant No. 2004CB418406), National Natural Science Foundation of China (Grant Nos. 40774049 and 40474038), and Computer Network Information Center, Chinese Academy of Sciences (Grant No. INF105-SCE-02-12)     

基于频率摄动理论识别悬臂梁损伤方法的试验研究

将悬臂梁的振动理论和矩阵摄动理论相结合,推出悬臂梁损伤或缺陷的识别公式.通过2根钢悬臂梁的试验,测出其损伤前后的频率,并根据测试结果对梁的损伤程度进行判定.结果表明,用摄动理论不仅可以识别悬臂构件的损伤位置,还可以定量求出其损伤程度.     

新泰市岳家庄金矿构造控矿特征

新泰市岳家庄金矿区位于鲁西地区中南部的下港 -化马湾 -蒙山构造岩浆杂岩带内。该杂岩带发育在新太古代花岗岩—绿岩带中 ,并经受了韧性剪切带和多期次脆性断裂活动的改造。带内分布有燕山期脉岩、火山岩和以金为主的多金属元素组合异常 ,因此是有利的金矿成矿构造带。本文通过对岳家庄金矿区控矿构造体系的详尽分析 ,认为韧性剪切带属中温中部构造层次的压剪性韧性变形。它与雁翎关岩组的复合部位是金富集的有利部位 ,而与北西向脆性断裂叠加部位则是更为重要的控矿构造     

花鸟山外海域几种形态磷在柱状沉积物中的分布及环境意义

综合运用 SEDEX化学法、ASPILA化学法和 XRF仪器分析法 ,对在东海赤潮多发区花鸟山外海域采集的柱状沉积物进行了总磷及其不同形态磷含量的系统分析。研究表明 ,总磷及其不同形态磷在沉积柱垂向上的分布有一定的变化规律。在采样深度范围内 ,总磷 (TP)、有机磷 (OP)和铁结合态磷 (Fe - P)的含量自下而上增高 ,而吸附态磷 (Ad - P)、自生钙结合态磷 (Ca- P)与碎屑态磷 (De- P)的含量向上递减。样品柱具有较均匀的粒度及矿物、化学组成 ,基本可以排除沉积物质来源和沉积环境变化对沉积物中磷含量的影响 ,而且也不能仅仅用早期成岩作用来解释磷的上述行为。不同形态磷在柱状沉积物中的分布规律 ,在一定程度上反映了近年来陆源区环境污染加剧的趋势。     

厦门地区杂色花蛤的病毒观察与检测

在厦门海区对虾养殖内外环境中,电镜观察发现了杂色花蛤肝胰腺的一种杆状病毒和两种球状病毒.杆状病毒大小为(85～90)nm×(240～264)nm,有包膜,存在于细胞核中,细胞质可见.一种球状病毒直径为70～80nm,有包膜,存在于细胞质中.另一种球状病毒直径为95～120nm,有包膜,存在于细胞核中.用免疫酶组织化学法检测表明,杂色花蛤所带杆状病毒与BMNV有抗原性正相关,其检出率随季节变化,暗示自然生长且感染病毒的杂色花蛤可能是日本对虾杆状病毒病的传染源.     

Studies on immunodiagnosis of hepatopancreatic parvo-like virus diseases ofPenaeus orientalis

This paper describes a rapid procedure for diagnosis of penaeid viral disease using the immune serological method. The SPA (Staphylococcal Protein A) coagglutination test in early diagnosis of penaeid viral disease has yielded satisfactory results. This is the first time SPA is used in China for diagnoses of viral diseases of marine invertebrates, especially penaeid shrimp. The SPA early diagnostic method is characterized by accuracy, rapidity, simplicity and convenience, low cost, high specificity, strong sensitivity and micro-detectability, and easy dissemination and adaptability in prawn farms.     

非同构简单无向图的计数方法

首先在正整数的所有无序划分构成的集合上定义了一个全序关系，由此将所有无序划分的全体分成一些互不相交的子集，从而得到生成所有无序划分的方法，也就得到了n顶点的全体置换格式，然后给出了由简单无向图的顶点的置换格式确定简单无向图边的置换格式的方法，最后给出了n顶点非同构简单无向图的生成多项式并给出了部分计算结果。