反馈网络对地震计性能的影响

通过对地震计数学模型的详细分析，阐明了不同形式的反馈网络在地震计中的不同作用，结果表明：①机械部分对反馈式地震计频率特性的影响在一定条件下可以忽略。②地震计的类型和通频带由反馈网络决定。③反馈扩大地震计的动态范围，降低了地震计的分辨率。④反馈系统对地震计的信噪比没有影响。     

Seismic characteristics near the epicenter of the 1303 Hongtong M=8 earthquake, Shanxi Province and its implication

Introduction A great earthquake occurred on Sept. 25 of 1303 (Seventh of Dade, Yuan Dynasty) around Zhaocheng and Hongtong in Shanxi Province. The great earthquake is a very famous one, which is affirmed as the first earthquake with magnitude 8 in Chinese history. The catastrophes took place; meanwhile, huge archives of the disaster were recorded. According to these disaster recordings, the first isoseismal map in China was delineated, which provide us with abundant information of intensi…     

固体中非线性纵波一维数值模拟

分别采用四阶精度和六阶精度的中心差分格式，限定扰动（振幅）的取值在10-3m以内，进行了一维固体中非线性纵波传播的数值模拟，并通过两种格式对比性研究来保证差分格式的稳定性和收敛性．讨论了边界所输入正弦波的振幅、频率及介质非线性系数对非线性波的影响．模拟结果与位于生存周期之内近似解析解相符，并证实非线性波在传播过程中会发生波形畸变、产生倍频效应及谐波能量积累，而且这些非线性波动特征随输入振幅、频率和介质非线性系数（绝对值）的增大而增强．      

中国大陆现今地壳运动的动力学机制

用有限元方法对中国大陆及邻区地壳与岩石圈运动进行动力学模拟. 以一个黏性薄板（牛顿黏滞、非牛顿黏滞）比拟中国大陆岩石圈，通过解力平衡方程得到中国大陆地壳相对于欧亚板块的运动速度分布，并与最新观测的GPS测量资料比较. 结果表明，造成中国大陆及邻区现今地壳运动及形变的主要动力来源为印度-欧亚板块碰撞及中国西部地区，特别是青藏高原的巨大重力位能. 相对而言，前者的贡献大于后者. 同时，构成中国大陆岩石圈的介质具有较强的非均匀流变特性，呈现出分块特征.     

剩余视极化率异常在寻找焦家式深部金矿床的应用研究

本文首次提出剩余视极化率异常的概念和求 取公式。利用已知焦家式深部金矿床上所 测得大、 小两种极距激电中梯视极化率ηα,而求得的剩余视 极化率ηαsy,经与已知深部矿床对比,发现其ηαsy异 常具有单纯反映矿体的能力,而与破碎带内的强蚀 变岩石所形成的极化率异常无关。     

Investigation of the electrical conductivity beneath China using geomagnetic spatial gradient method

Ｉｎｖｅｓｔｉｇａｔｉｏｎｏｆｔｈｅｅｌｅｃｔｒｉｃａｌｃｏｎｄｕｃｔｉｖｉｔｙｂｅ┐ｎｅａｔｈＣｈｉｎａｕｓｉｎｇｇｅｏｍａｇｎｅｔｉｃｓｐａｔｉａｌｇｒａｄｉ┐ｅｎｔｍｅｔｈｏｄＧＵＯ－ＨＵＡＦＡＮ（范国华）ＴＯＮＧ－ＱＩＹＡＯ（姚同起）ＺＵＯ...     

Surface deformation and gravity changes caused by dilatancy in a layered elastic-vis-coelastic half space

Ｓｕｒｆａｃｅｄｅｆｏｒｍａｔｉｏｎａｎｄｇｒａｖｉｔｙｃｈａｎｇｅｓｃａｕｓｅｄｂｙｄｉｌａｔａｎｃｙｉｎａｌａｙｅｒｅｄｅｌａｓｔｉｃ┐ｖｉｓ┐ｃｏｅｌａｓｔｉｃｈａｌｆｓｐａｃｅＹＯＮＧＷＡＮＧ（王勇）ＨＯＵＴＳＥＨＳＵ（许厚泽）Ｉｎｓｔｉｔ...     

Large scale characteristic distance between strong earthquake

ＬａｒｇｅｓｃａｌｅｃｈａｒａｃｔｅｒｉｓｔｉｃｄｉｓｔａｎｃｅｂｅｔｗｅｎｓｔｒｏｎｇｅａｒｔｈｑｕａｋｅＸＩＡＮＦＵＤＵ（杜先富）ＳＨＡＯＸＩＥＸＵ（许绍燮）ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｐｈｙｓｉｃｓ，ＳｔａｔｅＳｅｉｓｍｏｌｏｇｉｃａｌＢ...     

Lateral Inhomogeneity of Basement Layer in Three Gorges Region of Changjiang River (Yangtze River)

Seismic tomography from the Pg wave data along the non-longitudinal profile in the Three Gorges Region is presented in this paper.The seismic tomography method,and the acquisition and analysis of seismic travel time are broadly outlined.The tomography of basement reveals a great amount of significant information and shows that the low-velocity zone is due to the lithologic difference and the fault fracture zone.It also demonstrates that there exist three high-velocity zones with v>6.4 km/s at the basement; the largest of zones which strikes north-south is located at the southwestern side of Huangling Anticlinorium and extends into the anticlinorium northward.The other two high-velocity zones are,respectively,situated at the eastern side of the anticlinorium and the western side of the profile.The high-velocity zones are inferred to originate from the upwelling of material with high-velocity from deep crust.     

Seismic Zoning Methods That Assume Spatially Non-Uniform Earthquake Distribution in the Potential Source:Their Application to Western Panzhihua and Central and Southern Shanxi Province

Based on the models of non-uniform earthquake distribution in the potential source,the seismic zonation of Western Panzhihua and Central and Southern Shanxi Province is studied.The results show that the usual uniform distribution model may underestimate the seismic risk and result in a reduction of the areas of high intensity.The influence of each non-uniform probabilistic distribution method on the result of seismic zoning is discussed.