北京地区地震、爆破和矿震的记录图识别   总被引：2，自引：7，他引：2  

赵永  刘卫红  高艳玲 《地震地磁观测与研究》1995,16(4):8-54

以北京地区台网数据为例，讨论了天然地震、人工地震和矿山地震的区别，并对多重地震和不同地区的地震特征进行了分析。  相似文献   

Temporal changes in shear wave splitting after the M=5. 2 Shimian Earthquake     

陈天长  李志君  张润生  杜国光  彭万星 《地震学报(英文版)》1995,(1)

ＴｅｍｐｏｒａｌｃｈａｎｇｅｓｉｎｓｈｅａｒｗａｖｅｓｐｌｉｔｔｉｎｇａｆｔｅｒｔｈｅＭ＝５．２ＳｈｉｍｉａｎＥａｒｔｈｑｕａｋｅ　ｏｆ　Ｊｕｎｅ　９，１９８９Ｔｉａｎ－ＣｈａｎｇＣＨＥＮ；Ｚｈｉ－ＪｕｎＬＩ；Ｒｕｎ－ＳｈｅｎｇＺＨＡＮＧ；ＧｕｏＧｕ...  相似文献   

关于发展我国地震科技信息工作的思考     

陈宇卫  董梅 《国际地震动态》1995,(7):9-12

地震科技信息的积累和应用是我国地震科学事业发展的基础，我国的地震信息工作在地震预报的探索和研究中以及地震工程应用中，均发挥了重要的作用，为进一步认识地震科技信息的重要性，发展这一事业，本文就地震科学研究与地震科技信息的内在联系，地震科技信息的运行机制及地震科技信息工作的发展提出了一些新的观点。  相似文献   

赤道带边界层结构的数值研究     

赵鸣 《气象学报》1995,53(1):10-18

在气压随纬度的不同分布条件下，数值求解了二维赤道带大气边界层非线性运动方程组，得到了不同气压分布下赤道带边界层运动特征，显示了平流的重要作用。在赤道带存在低压槽或气压单调随纬度增加而减少的情况下，都得出在赤道附近某纬度有一相应于赤道辐合带（ＩＴＣＺ）的垂直运动大值集中区域存在，克服了前人用临界纬度机制解释边界层大抽吸速度时略去重要的非线性项的处理上的困难。  相似文献   

耗能-隔震柔性底层钢管混凝土-钢筋混凝土组合框架的实验研究   总被引：1，自引：1，他引：1  

欧进萍  邱法维 《地震工程与工程振动》1995,(2)

本文用钢管混凝土柱作为结构底层耗能柱、用承重墙和隔震器控制结构底层倒塌破坏,从而提出了一种新的耗能-隔震柔性底层结构体系。通过本文12根钢管混凝土柱和文献[7]中7根钢管混凝土柱的低周疲劳实验,初步确定了钢管混凝土柱地震损伤模型的参数;通过两个钢管混凝土-钢筋混凝土三层框架模型和一个纯钢筋混凝土三层框架模型的拟动力实验,研究和比较了两类结构体系的地震损伤。  相似文献   

Slab weakening: Mechanical and thermal-mechanical consequences for slab detachment     

Shoichi  Yoshioka David A.  Yuen Tine B.  Larsen 《Island Arc》1995,4(2):89-103

Abstract Slab detachment is a geophysical instability whose manifestation can be revealed by seismic tomography. Evidence of this phenomenon is in the Dinarides/Hellenic and the New Hebrides subduction zones. Subducted slabs in these regions are torn horizontally at depths ranging from 100 to 300 km. We constructed a viscoelastic three-dimensional finite element model and investigated the state of stress. We found that an area with high stress concentration of the order of several hundred MPa is formed near the tip of the tear inside the slab, which can cause lateral migration of the tear. Favorable conditions for slab detachment are characterized by large interplate frictional force at a subduction zone and small slab resistance force deeper down. Stress concentration increases with the down-dip tension inside the slab. The phenomenon of slab weakening has also been studied from a thermal-mechanical standpoint, using a two-dimensional convection model with non-Newtonian, temperature-dependent rheology. The stress-dependent rheology plays an important role in causing local weakening of the descending slab. In strongly time-dependent situations the fast descending slab is not strong everywhere but has a weak region in the middle, making it vulnerable to slab detachment. The presence of viscous heating will enhance slab detachment tendency by further weakening the interior by the frictional heating. Besides these effects, there are other mechanisms which can also weaken the slab interior and help to make slabs more pliable and susceptible to detachment.  相似文献   

Non-stationary random seismic responses of non-uniform beams     

Jiahao Lin  Guizhen Song  Yong Sun  F. W. Williams 《Soil Dynamics and Earthquake Engineering》1995,14(4)

In this paper, a direct Ritz method is presented for analysing the responses of non-uniform shear beams subjected to the action of an evolutionary random seismic excitation. Because of the use of a pseudo ground acceleration, time-dependent random responses can conveniently be calculated by solving a set of deterministic equations of motion. These responses include power spectral densities, variances and higher spectral moments of any required responses of the beam. A non-uniform beam example was solved and the time-dependent variances and second spectral moments of both the beam-top displacement and the beam-base shear force are given to show the simplicity and effectiveness of the method, which can also easily be applied to other continuous elastic structures.  相似文献   

环太平洋地震带与柯里奥利力   总被引：5，自引：0，他引：5       下载免费PDF全文

杨学祥  朮洪亮 《地震工程学报》1995,17(4):13-16

柯里奥利力是地球自转的一种惯性力，它使垂直下降的物体向东偏转，垂直上升的物体向西偏转，是形成环太平洋地震带中东西两岸构造应力差别的根本原因。  相似文献   

横贯中国东南部的一条古断裂带   总被引：13，自引：0，他引：13       下载免费PDF全文

杨志坚 《地质科学》1987,(3):221-230

本文根据地质和物探资料,论证横贯中国东南部桂西、黔东南、湘西北、鄂东南、赣西北、皖东南和苏南的湘黔-江南古断裂带。中元古代为超壳断裂,古生代属壳断裂,是一条长期发展的控岩控矿的古断裂带。往东入海,延向济州岛和西南日本飞驒地区。  相似文献   

某地洼区F_1等断裂带构造地球化学特征及其铀成矿规律的探讨     

康自立  陈跃辉  刘海鹰 《华东地质学院学报》1987,(4)

本文运用地洼成矿理论和构造地球化学的方法,研究了区内 F_1成矿断裂等的构造特征和元素的变化规律以及铀等成矿元素的不断累增富集的成矿作用过程.区内钠矿床的形成大体上经历了铀的预富成岩(形成铀源地质体)→断裂动力改造热液(热水)成矿→表生淋积等三个主要发展阶段,形成了一个具有层控特征的多因复成铀矿床,从而为本区指明了找矿方向.  相似文献