Comparisons, processing and interpretation of the surveyed data by GMS-06 and other magnetotelluric sounding systems

In recent years, the data collecting and processing of magnetotelluric sounding （MT） have progressed greatly. How to improve the quality of field surveyed data and obtain the high quality parameters such as apparent resistivity and phase is the most important link during the overall flow. It is closely related to the signal-to-noise ratio of magnetic sensors, the resolution of data collecting units and relevant processing methods as well. Produced by Germany Metronix Measurement Instruments and Electronics Ltd., the new type multi-channel geophysical measurement system GMS-06 was already adopted and used by domeslic units such as Institute of Geology and Geophysics of Chinese Academy of Sciences and Tongji University. Based on the brief introduction of GMS-06, this paper will give the comparisons and analyses of the synchronous surveyed MT data by GMS-06, MMS-03 MT system which was also produced by Metronix and V5-2000 MT system produced by Canada Phoenix Geophysics Ltd.. Then the preliminary processing and interpretation results of the long period MT data observed by GMS-06 in the area of Shanghai and Zhejiang are also discussed in the paper.     

Genetic algorithm in seismic waveform inversion and its application in deep seismic sounding data interpretation

A genetic algorithm of body waveform inversion is presented for better understanding of crustal and upper mantle structures with deep seismic sounding （DSS） waveform data. General reflection and transmission synthetic seismogram algorithm, which is capable of calculating the response of thin alternating high and low velocity layers, is applied as a solution for forward modeling, and the genetic algorithm is used to find the optimal solution of the inverse problem. Numerical tests suggest that the method has the capability of resolving low-velocity layers, thin alternating high and low velocity layers, and noise suppression. Waveform inversion using P-wave records from Zeku, Xiahe and Lintao shots in the seismic wide-angle reflection/refraction survey along northeastern Qinghai-Xizang （Tibeteau） Plateau has revealed fine structures of the bottom of the upper crust and alternating layers in the middle/lower crust and topmost upper mantle.     

舟山深水港域开发建设的自然地质环境

本文从水深、水文、岸线、地貌及工程地质条件等诸方面阐述了中国舟山海域的自然地质环境, 说明了该港域具有建设大型深水港址的优越条件, 其开发建设将对中国东中部的经济发展具有重大意义。     

非均质动压巷道的一种新型支架

本文介绍了一种适用于受采动影响的非均质岩石巷道维护的多铰可缩U型钢支架。文中阐述了多铰可缩支架的设计原理、结构特点和计算方法; 进行了实验室和井下工业性试验, 取得了良好的支护效果。分析和试验表明, 多铰可缩U型钢支架兼有铰接支架和可缩支架两者的优点; 承载力大, 能自动调节载荷, 适应不均匀的多变地压; 具有可缩性好, 复用率高, 架设与回收方便等特点, 是国内外首创的新型支架。     

湘中锑矿深源流体的地幔柱成矿演化

深源流体在地幔柱热驱动下，历经长期壳幔循环，形成高浓度古水热成矿流体，为湘中锑的成矿蓄积丰沛的矿源。     

用模糊距离系数区分深部气层和干层

本文扼要地介绍了模糊距离系数分类法的原理,并用该方法对东濮凹陷深部气层和干层作了聚类分析,与试井结论相比效果可佳。因此,该方法对深部层测井解释颇具价值。     

低频数字电磁测深仪器系统及其在攀-西地区的应用

本文介绍了在CTM-302型三分量磁通门磁力仪的基础上,研制的低频数字化大地电磁测深仪器系统;并根据该系统的功能和在攀-西地区的应用情况,对其发展前景进行了探索。     

Design criteria for roadway supports to resist dynamic loads

Summary Conditions under which dynamic loads occur in mines are briefly described and the special vulnerability of roadways in coal mines to fail under dynamic load is considered. A method for assessment of shock load energy anticipated is proposed, based on the volume of rock and the velocity of rock particles induced by rapid rock failure and/or seismic tremors. Case examples from Upper Silesian coal mines are given and the safety factor of steel supports against the shock energy from rockbursts is discussed. The shock energy damping ability of various parts of steel supports and support systems is calculated as a basis for rational support design. Results of six mine experiments where various types of roadway support were installed and then loaded dynamically by blasting within surrounding rocks are discussed.     

P-wave crustal velocity structure in western Sichuan and eastern Tibetan region

A deep seismic sounding profile located in the western Sichuan and eastern Tibetan region extends from Batang (Zhubalong) to Zizhong, Sichuan. It passes through the Songpan-Garzê Fold System and the Longmenshan Tectonic Zone, and ends in the Yangtze Craton. Based on the travel times of phases on the profile, incorporating information on the relevant amplitudes, we determined 2-D P-wave crustal velocity structure along the profile, analyzed the principle differences between the crustal and upper mantle structure in the Western Sichuan Plateau and Sichuan Basin, discussed the deep feature of the major faults on the profile, the tectonic relation between the Yangtze Craton and the Tibetan Plateau and the deep structural environment where strong earthquakes occurred.