相位激电法(偶极-偶极)单频电磁耦合校正方法

主要介绍一种相位激电法(偶极—偶极,以下简称偶极)电磁耦合校正方法,其原理是将视电阻率近似视为均匀大地电阻率,利用均匀大地条件下偶极装置电磁感应响应的正演计算方法,算出电磁感应响应,再将其从观测的总响应中去除,从而达到电磁耦合校正的目的。     

楚雄盆地中—新生界构造变形特征

根据近年笔乾研究，楚雄盆地中生代以后经历三期变形作用：早期（燕山期）主要发育于密者挤压逆冲带，显示横向置换特征，中期（喜马拉雅早期）是主变形期，西带显示由SW向NE逆冲，以叠瓦状闻和冲构造系统为其特征，晚期（喜马拉雅中晚期）发育于陡坡和深切割区，表现为重力滑动构造，这些构造期次的确定为研究该盆的发展，演化提供理论依据，亦为寻找油气资源提供靶区。     

Evolution of accelerographs, data processing, strong motion arrays and amplitude and spatial resolution in recording strong earthquake motion

This paper presents a review of the advances in strong motion recording since the early 1930s, based mostly on the experiences in the United States. A particular emphasis is placed on the amplitude and spatial resolution of recording, which both must be ‘adequate’ to capture the nature of strong earthquake ground motion and response of structures. The first strong motion accelerographs had optical recording system, dynamic range of about 50 dB and useful life longer than 30 years. Digital strong motion accelerographs started to become available in the late 1970s. Their dynamic range has been increasing progressively, and at present is about 135 dB. Most models have had useful life shorter than 5–10 years. One benefit from a high dynamic range is early trigger and anticipated ability to compute permanent displacements. Another benefit is higher sensitivity and hence a possibility to record smaller amplitude motions (aftershocks, smaller local earthquakes and distant large earthquakes), which would augment significantly the strong motion databases. The present trend of upgrading existing and adding new stations with high dynamic range accelerographs has lead to deployment of relatively small number of new stations (the new high dynamic range digital instruments are 2–3 times more expensive than the old analog instruments or new digital instruments with dynamic range of 60 dB or less). Consequently, the spatial resolution of recording, both of ground motion and structural response, has increased only slowly during the past 20 years, by at most a factor of two. A major (and necessary) future increase in the spatial resolution of recording will require orders of magnitude larger funding, for purchase of new instruments, their maintenance, and for data retrieval, processing, management and dissemination. This will become possible only with an order of magnitude cheaper and ‘maintenance-free’ strong motion accelerographs. In view of the rapid growth of computer technology this does not seem to be (and should not be) out of our reach.     

Structure and compressibility of synthetic ZnAl2O4 (gahnite) under high-pressure conditions, from synchrotron X-ray powder diffraction

 The structural behavior of synthetic gahnite (ZnAl₂O₄) has been investigated by X-ray powder diffraction at high pressure (0–43 GPa) and room temperature, on the ID9 beamline at ESRF. The equation of state of gahnite has been derived using the models of Birch–Murnaghan, Vinet and Poirier–Tarantola, and the results have been mutually compared (the elastic bulk modulus and its derivatives versus P determined by the third-order Birch–Murnaghan equation of state are K ₀=201.7(±0.9) GPa, K ^′ ₀=7.62(±0.09) and K ^″ ₀=−0.1022 GPa⁻¹ (implied value). The compressibilities of the tetrahedral and octahedral bond lengths [0.00188(8) and 0.00142(5) GPa⁻¹ at P=0, respectively], and the␣polyhedral volume compressibilities of the four-␣and␣sixfold coordination sites [0.0057(2) and 0.0041(2) GPa⁻¹ at P=0, respectively] are discussed. Received: 15 January 2001 / Accepted: 23 April 2001     

海气耦合气侯模式的依时解

运用量子力学方法，精确地求出了海气耦合随机－动力模式的依时解．对依时解的分析表明：当气候系统处于基态时，系统的行为呈布朗运动形式，由此从理论上证明了Ｈａｓｓｅｌｍａｎｎ关于随机气候模式建立的立足点．当系统处于第一激发态时，系统运动呈随时间衰减的形式；在一定条件下则为周期振荡，主周期长度为２．３年．最后将结果用来讨论二氧化碳浓度倍增时的气候影响．     

A COUPLING THREE DIMENSIONAL BAROCLINIC MODEL OF BIWA LAKE AIR-WATER SYSTEM

I.IntroductionTherearealotofstudiesdealingwithhydrodwiaAncsoflakes,numericalsimulationoflakecurrentsystemst5,7,lO,l31,andwiti1windsystemsoverlakesandnumericalsimulationontheland-lake/seaormountain-valleybreeze[4,6,8].Usually,ti1emodelsinti1eatmosphericboundarylayerandinlakewaterweresimulatedseParately.InfaCt,theprocessesintheatmosphericboundarylayeroverlakesandti1eprocessesinthelakewaterareinteraCtedstronglyeachoti1er.Collecteddatashow,thatalmoStalllargelakes,marginalseas,estuariesandlagoon…     

B-polarization induction in two thin half-sheets coupled to the mantle by a conducting crust—II. Solution by the mode-matching method, the fields above the conductors, and example results

The mode-matching method is used to obtain an exact analytical solution to the problem of B -polarization induction in two adjacent thin half-sheets, lying on a conducting layer that is terminated by a perfect conductor at finite depth. These components of the model represent, respectively, the Earth's conducting surface layers, crust, and mantle. In dimensionless variables, the model has three independent parameters, these being the two thin-sheet conductances and the layer thickness. The mode-matching solution obtained in this paper is shown to be identical lo that derived via the Wiener-Hopf method in a companion paper (Dawson 1996), and so provides additional verification of that solution. As was shown in the companion paper, the solution for the present model contains, as special limiting cases, those for three models considered earlier by various authors. The second part of the present paper addresses the solutions for the electric fields in the non-conducting half-space above the conductors, which represents the atmosphere. In the final part, sample numerical calculations are presented to illustrate the solution.     

羊石坑汞矿床包裹体地球化学特征研究

羊石坑汞矿是80年代后期勘探的大型汞矿床,矿床位于川黔汞矿带北部,矿体以细脉、网脉浸染状为主。包裹体地球化学研究表明,成矿温度120～250℃,成矿流体盐度为10.6％(NaCl),流体沸腾发生在250℃左右,包裹体圈闭的最小压力为40×10~5Pa,成矿深度约为400m。结合成矿构造环境、构造演化、探讨了构造改造成矿机制和规律。