GPS测量揭示的福建沿海地区的现今地形变

根据福建GPS监测网3期(1997，1999，2001)观测资料的计算结果，分析了福建沿海地区的现今地形变特征。(1)福建地区有两个剪应变相对集中区，北部是湾口、闽清一带；南部是泉州、厦门一带。这两个区的剪应变随时间变化有加强的趋势。(2)南部剪应变集中区基本处于压应变环境，并且主要断裂两侧存在相对较高的剪应变集中区，值得关注。     

基于断层相互作用的地震活动有限元模型

基于断层相互作用，初步建立了西南地区有限元动力学模型，讨论了由于地震发生产生的应力变化对西南地区整个系统的应力调整情况。初步结果表明，许多强震均发生在应力增强区。因此，本模型对判断未来强震危险区有一定的意义。     

华北地区地壳水平运动演化特征研究

将华北地区划分为阴山-燕山、鄂尔多斯、山西、太行、冀鲁、胶辽6个块体，应用1995、1996、2001年GPS观测资料研究了这些块体的水平运动演化特征。结果显示出华北地区各块体的相对运动既有继承性也有差异性。华北各块体的总体水平运动趋势是向东漂移，但是个别块体，如鄂尔多斯块体，在1995～1996年期间出现了相对的西向运动。1995～1996年期间华北各块体的运动速率比1996～2001年期间的运动速率要大，特别是阴山-燕山块体。1995～1996年期间鄂尔多斯块体和相邻的山西块体表现为张性分离，阴山-燕山块体之间表现为左旋走滑，这一现象可能与1996～1999年期间发生在华北西北部的3个地震的孕震过程有关。进一步分析表明，加密的连续GPS观测可用于地震预报。     

应用GPS观测资料反演潜在震源参数

根据点源孕震力学模型 ,应用福建 台湾地区GPS位移速度资料反演 1999年台湾南投Mw7.6大震前的孕震参数。反演所得的震中与实际发生的地震震中相差 6 7km ,主压应力场方向为 319.9°,倾角 - 2 8.6° ,即仰角2 8.6° ,与用震源机制解得到的P轴方向和倾角分别相差 17°和 8.6° ,与菲律宾板块向亚洲板块挤压的方向是一致的。用土耳其地区GPS位移速率资料反演 1999年土耳其Mw7.6地震前的孕震参数 ,反演得到的震中与实际震中相差 70km ,主应力方位角和倾角分别为 16 2 .5°、11.5°,与震源机制解结果分别差 2 4 .5°和 1.5°。     

Impending HRT wave precursors to the Wenchuan M_s8.0 earthquake and methods of earthquake impending prediction by using HRT wave

We deployed four geo-electric monitoring stations in Sichuan and Yunnan provinces from 2004, using the new generation of equipment (PS-100) and technologies to capture the HRT wave earthquake precursor. Before the Wenchuan Ms8.0 earthquake, we recorded the HRT wave precursor at the only operating station in Hongge (HG, Δ=465 km) and found that significant impending signal had been recorded at the station in the early morning ( 0―5 am) of 12th of May, 2008. The precursor for this earthquake is consistent wit...     

秦岭造山带中两条新元古代岩浆岩带

秦岭造山带中的新元古代岩浆岩带分为南、北两带,北带主要发育于秦岭岩群分布区,由新元古代早期花岗质岩石组成,由于受到强烈变质、变形,构成了NW向花岗片麻岩体群。岩石总体化学特征反映一种挤压性的动力学背景,其形成时代集中在95 5～84 4 Ma。南带分布于陡岭岩群分布区、南秦岭及“勉略构造带”以南的汉南一带,由双峰式火山岩、基性辉长岩侵入体及板内花岗质侵入岩组成。与北带花岗质岩石所受到的强烈变质、变形形成鲜明对比,除邻近构造带的岩体外,它们变质、变形程度较弱,以弱片麻状至块状构造为主,形成时代介于810～710 Ma之间,反映大陆地壳处于减薄的伸展机制。这条岩浆岩带的发育,显示秦岭造山带南部曾存在一条新元古代中期裂谷带,它是劳伦、澳大利亚和塔里木—扬子等大陆初始裂解的产物,也是古太平洋形成的前兆。     

An IBEM solution to the scattering of plane SH-waves by a lined tunnel in elastic wedge space

The indirect boundary element method(IBEM)is developed to solve the scattering of plane SH-waves by a lined tunnel in elastic wedge space. According to the theory of single-layer potential, the scattered-wave field can be constructed by applying virtual uniform loads on the surface of lined tunnel and the nearby wedge surface. The densities of virtual loads can be solved by establishing equations through the continuity conditions on the interface and zero-traction conditions on free surfaces. The total wave field is obtained by the superposition of free field and scattered-wave field in elastic wedge space. Numerical results indicate that the IBEM can solve the diffraction of elastic wave in elastic wedge space accurately and efficiently. The wave motion feature strongly depends on the wedge angle, the angle of incidence, incident frequency,the location of lined tunnel, and material parameters. The waves interference and amplification effect around the tunnel in wedge space is more significant, causing the dynamic stress concentration factor on rigid tunnel and the displacement amplitude of flexible tunnel up to 50.0 and17.0, respectively, more than double that of the case of half-space. Hence, considerable attention should be paid to seismic resistant or anti-explosion design of the tunnel built on a slope or hillside.     

渤海,黄海及沿岸强震聚类分析

采用聚类分析方法,研究了渤海、黄海及沿岸强震（Ｍ≥６）的空间分布。研究结果划分出了强震活动区及一些离散发生的强震。渤海的强震往往参与河北、山东、辽宁沿岸的强震分期、分区活动,且以强度高为特征;南黄海强震区自成体系,存在多期活动,与沿岸强震关系不大,以频度高为特点;北黄海内呈弱活动区的状态;朝鲜半岛强震独立成区,未向黄海内部延伸。文中给出分区的构造解释,并提出海域强震存在时空差异,在沿岸及海洋的防震     

石油深井地震观测中“井管突升,地面崩裂”异常机理及其社会影响对策研究

１９７９年以来,天津地区先后有９口石油深井出现了“井管突升,地面崩裂”异常现象,本文通过这９口井的基本情况,分布特点,异常类型等方面的分析,对这一现象产生的机理进行了研究;认为;这一现象的发生是由于地面局部沉降的结果,并对其进行数值模拟,力学解释,同时提出了安定社会的三项对策。     

Numerical Simulation of Wave Field at the Kemena River Mouth in Kalimantan Island

-By use of the parabolic equation of numerical simulation of wave which is suitable forlarge-angle propagation and Crank-Nicolson differential method,the wave field at the Kemema Rivermouth has been studied for analysis of sediment movement in the area.In order to reflect wave energy lossaccurately,the Bretchneider-Reid formula is quoted and the friction coefficient in the formula is discussedin this paper.The calculation results indicate that the wave becomes a little damped at the mouth ofKemena River influenced by the topography and bottom friction,and the wave at the east beach is higherthan that at the west beach,because the east beach extends out.