川滇地区地震活动与地球自转速率变化之间的关系     

陈学忠  李艳娥 《地震》2019,39(1):126-135

利用川滇地区1962—2016年间发生的MS≥6.0地震资料,在去除余震的情况下,分析了其发生与地球自转速率变化极值点之间的关系。得到以下结果:川滇地区MS≥6.0地震的发生与地球自转速率变化极值点具有显著关系,对于不同震级范围的地震,其与不同周期的地球自转速率变化有关。对于MS≥7.0的地震,有90%发生在地球自转速率季节性变化极值点前14天至后37天时间段内;对于6.0≤MS≤6.4的地震,有80%发生在地球自转速率短周期变化极值点前68小时至后30小时的时间段内;对于6.5≤MS≤6.9的地震,有87.5%发生在地球自转速率短周期变化极值点前36小时至后64小时的时间段内。地震发生在特定时间段的显著性检验结果表明,川滇地区MS≥6.0地震与地球自转速率变化极值点的关系都可以在α=0.05的显著性水平下通过显著性检验。这个结果表明,在地球自转速率发生转折的期间容易触发地震,对川滇地区地震发生时间预测具有参考意义。  相似文献   

安丘—莒县断裂小店—大店段断层活动证据及断层泥分布特征初步研究     

付俊东  王志才  熊仁伟  王雷  张广成  夏暖 《地震》2017,37(2):57-66

郯庐断裂带最新活动的断层分布于潍坊至嘉山一带, 而安丘—莒县断裂是郯庐断裂带的重要活动断裂之一。 基于地质考察、 高密度电法探测和钻孔联合剖面, 对安丘—莒县断裂小店—大店段断层活动证据及断层泥分布特征进行研究。 地质考察发现紫红色砂砾岩逆冲到全新世耕植土上方, 两者之间发育断层泥带, 断层泥内含少量角砾岩, 为全新世活动逆断层。 高密度电法探测结果表明断层通过位置电阻率差异明显。 钻孔联合剖面揭露的地层: 全新世耕植土、 全风化砂质泥岩、 强风化砂质泥岩、 碎裂岩、 断层泥带及中风化砂质泥岩。 钻孔K1和K2揭露深灰色断层泥带, 倾向西, 倾角约为74°, 厚度约为13.9 m, 与南侧出露的断层泥带产状相协调。 工作区范围内, 发育多处褶皱、 破碎带和断层泥带, 断层表现为全新世逆断层性质。  相似文献   

基于InSAR的海原—老虎山—毛毛山断裂带现今地壳形变特征     

孙赫  徐晶  邵志刚 《地震》2017,37(2):78-85

本文利用107景L波段2007年至2011年的ALOS/PALSAR卫星影像, 采用干涉图堆叠技术, 基于GAMMA软件, 利用影像数据公共区域的均值统计校正, 首次获取海原—老虎山—毛毛山断裂带整体地区的平均地壳形变速度场, 将大范围形变结果进行统一表达。 沿断层方向形变结果表明, 断裂带两侧存在明显差异运动, 断层的运动性质为左旋, 其中毛毛山-老虎山段的差异运动比较显著, 在震情跟踪工作中要给予重视。 另外, 结合研究区域内长期GPS水平速度场, 从多角度研究了区域现今地壳运动的特征。  相似文献   

Radio Properties of BL Lac Object S5 2007+777     

《Chinese Astronomy and Astrophysics》2019,43(4):519-538

S5 2007+777 is a typical BL Lac object with a low peak frequency, and a kpc-scale extended X-ray jet. In the literature, the Doppler factor derived at the X-ray waveband by means of model estimation is about 13.0, then the intrinsic jet scale can reach the order of magnitude of 1 Mpc. In this work, we have studied the radio structure of the jet, the brightness temperature, proper motion and other properties of this source with the collected EVN (European VLBI Network) high-resolution archive data, and the American VLBA (Very Long Baseline Array) 15 GHz observed data, etc. It is found that the jet directions measured at the different wavebands of the VLBI (Very Long Baseline Interferometry) are consistent, but slightly different from the direction of the kpc-scale X-ray jet given by the literature and the direction of the VLA (Very Large Array) radio jet, which means that the Doppler brightening effect exists in the jet emission of the source. Both the mean value and median value of the radio Doppler factor of this source estimated from the brightness temperature that measured by the VLBI are 5.0, which is smaller than the Doppler factor at the X-ray waveband given by the literature, but consistent with the Doppler factor at the radio waveband obtained by using the other methods in the literature. Furthermore, by fitting the data observed in multiple epochs, it is found that the various components of the source at the same waveband do not have an evident proper motion in a long epoch, but the proper motion in short epochs exhibits even a super-luminal motion. This may be caused by the transfer of the central position of the component with a low surface brightness. Meanwhile, this also verifies the conclusion that the radio Doppler factor estimated previously is not very large, and smaller than the Doppler factor in the X-ray waveband. By using the obtained radio Doppler factor, it is found that the source has an intrinsic radio jet of rather large scale, which may reach 0.5 Mpc, because the mean value is adopted in this case, thus it indicates that the source also possibly possesses a jet close to the scale of a giant radio galaxy.  相似文献   

Reliability Analysis of Main-axis Control System of the Antarctic Equatorial Astronomical Telescope Based on Fault Tree     

L.I. Yun  Yang Shi-hai 《Chinese Astronomy and Astrophysics》2018,42(3):448-461

The Antarctic astronomical telescopes work chronically on the top of the unattended South Pole, and they have only one chance to maintain every year. Due to the complexity of the optical, mechanical, and electrical systems, the telescopes are hard to be maintained and need versatile expedition teams, which means that an excessive awareness is essential for the reliability of the Antarctic telescopes. Based on the fault mechanism and fault mode of the main-axis control system for the Antarctic equatorial astronomical telescope AST3-3 (Antarctic Schmidt Telescope 3-3), the method of fault tree analysis is introduced in this article, and we obtain the importance degree of the top event from the importance degree of the bottom event structure. From the above result, the hidden problems and weak links of the system can be effectively found out, which will indicate the direction for improving the stability of the system and optimizing the design of the system.  相似文献   

河北中山沟金矿含金石英脉中锆石U-Pb年代学及Hf同位素研究     

陈超  张福祥  王丰翔  牛树银  马奎  王云静  楚洁 《地质论评》2021,67(2):385-398

热液石英脉型金矿石中锆石可以来自围岩,也可以由热液活动形成.因此,对其研究有助于揭示成岩成矿信息.中山沟金矿位于河北省张家口—宣化(张宣)地区,主要呈石英脉型产于水泉沟岩体西段,是张宣幔枝构造核部的典型金矿床之一.本文在矿区地质特征基础上,主要开展含金石英脉内锆石形态学特征、LA-ICP-MS U-Pb同位素测年以及H...  相似文献   

旋涡星系中恒星形成对旋涡结构的影响   总被引：1，自引：0，他引：1  

黄思琴  宋国玄 《中国天文和天体物理学报》1991,(1)

本文利用N体数值模拟方法,讨论了旋涡星系中恒星形成对旋涡结构的维持作用。在假定恒星是在一定密度区域中形成以及恒星诞生率为1.0M_⊙/年的情况下,模拟结果表明,旋涡图象的维持时间是未考虑恒星形成模型的2.3倍。  相似文献   

Local integrals and the plane motion of a point in rotating systems     

Vadim A. Antonov  Faziliddin T. Shamshiev 《Celestial Mechanics and Dynamical Astronomy》1993,56(3):451-469

This paper deals with the plane motion of a star in the gravitational field of a system which is in a steady state and rotates with a constant angular velocity. For these systems a class of potentials permitting a local integral, linear with respect to the velocity components, has been found. The concept of the local integral itself was introduced by one of the authors of the present paper (Antonov, 1981). A detailed model has been constructed. The corresponding domain of the particle motion and the form of the trajectory coils have been determined. The result is compared with the motion in a more realistic potential.  相似文献   

基于PDA的水准测量内外业一体化系统开发   总被引：2，自引：0，他引：2  

徐菊华  史保勇 《地理空间信息》2007,5(3):104-106

水准测量是工程建设的重要内容之一,在电子水准仪尚未普及的情况下,光学水准仪在水准测量工作中仍占主导地位。随着PC1500、PC-E500、HP200等记录机型的淘汰,作者选用基于Windows Mobile技术的PDA作为记录器,以实现水准测量内外业一体化的目标,强调人性化和智能化程序设计。详述了基于PDA的外业数据子系统、内业数据预处理子系统及水准网平差子系统的开发目标和主要功能。  相似文献   

若干恒星形成区的^12CO（J=1—0）与^13CO（J=1—0）观测   总被引：1，自引：0，他引：1  

毛瑞青  韩溥 《紫金山天文台台刊》1997,16(2):69-76

首次利用紫金山天文台青海观测站13.7m毫米波射电望远镜对若干分子云与恒星形成区的~(12)CO(J=1—0)和~(13)CO(J=1—0)分子辐射进行了观测,得到了各自中心位置的谱线轮廓。作为一个实例本文将介绍如何通过对分子云~(12)CO(J=1—0)和~(13)CO(J=1—0)谱线的综合分析与计算得到云中的物理参数。  相似文献