广东省强震台网建设概况

本文论述了广东省强震台网建设的目的和原则,介绍了台网中使用的强震仪,收取的强震记录和处理情况、台网管理及其展望。     

运用人工神经网络作汛期降水预报

本文提出汛期降水预报的人工神经网络方法，并选择一组标样进行了具体分析，预报成功率达100％，结果表明，该方法性能良好，可望成为汛期降水预报的有效手段。     

地理科学的信息化与现代化

20世纪我国地理学的成就是空前辉煌的,奠定了现代化的科学基础,21世纪面对全球化、网络化和知识经济的机遇和挑战,需要把全球研究提到日程上来,对地观测技术系统的进步和时、空分辨率的提高,已使全球化同步动态监测成为现实,“地球信息科学”和“数字地球”战略研究提高了对城市化与资源、生态、环境问题的再认识;增强了地理战略决策和参予工程规划、设计的能力。地理学本来就是取法自然、又以人为本的综合性学科,从来就很注重探索时间规律与空间格局及其转换,通过全球化、网络化和智能化,21世纪的地理科学、必将焕然一新。     

武汉市轨道交通二号线工程场地砂土液化分析

本文详细介绍了武汉市轨道交通二号线工程场地地震地质灾害评价中对饱和砂土液化的分析方法及评价结果。     

新疆某水库大坝变形监测方法研究

结合新疆克拉玛依三座坝线均长达5km左右的平原水库,介绍了由于地质环境影响大坝沉降和位移而建立变形监测控制网、观测方法、数据分析处理以及工作中的一些方法和经验.     

镇康芦子园铅锌矿床特征及成因

芦子园铅锌矿产于镇康复背斜核部寒武系沙河厂组大理岩、板岩、片岩地层中，沿背斜轴部产生的断层及层间破碎带是主要的容矿构造，成矿物质来源于地层、酸性及基性岩浆热液，矿床成因为沉积-热液改造叠生型铅锌矿床。     

三维地理信息数据在移动通信网络规划和优化系统中的应用

随着移动通信的迅猛发展,网络规模不断扩大,借助数字地图,尤其是三维地理信息数据进行网络规划和优化已变得越来越重要。本文主要介绍三维地理信息数据在建立移动通信网络规划和优化系统中的应用。     

Spheroidal oscillations of the Earth stimulated by the Sumatra-Andaman earthquake with CDSN data

The 0S2~0S54 spheroidal modes of Earth’s free oscillations, triggered by the great Sumatra-Andaman earthquake of 26 December 2004 are retrieved from VHZ data recorded by seven upgraded stations of China Digital Seismograph Network (CDSN). We compare these spheroidal modes with theoretical free oscillation spectra calculated from the Preliminary Reference Earth Model (PREM) and find a coincidence between their periods. Spectral splitting phenomenon is observed obviously in 0S2, 0S3, 0S4, 2S1 and 1S2 free oscillation modes. What is most noticeable is that the oscillation mode 2S1 is reported for the second time (the first time by Rosat et al) without any data stacking. We simulated the split singlet of 0S2 mode on seven CDSN stations based on general focal mechanism and seismic moment of the earthquake. The result shows that seismic moment of the earthquake can reach 1023 N.m. We also find that the recording of Earth’s free oscillations carries abundant information of source mechanism and earthquake location, which is applicable to the detailed study of source rupture parameters.     

3D image-based characterization of fluid displacement in a Berea core

Improved network flow models require the incorporation of increasingly accurate geometrical characterization of the microscale pore structure as well as greater information on fluid–fluid interaction (interfaces) at pore scales. We report on three dimensional (3D) pore scale medium characterization, absolute permeability computations for throat structures, and pore scale residual fluid distribution in a Berea core. X-ray computed microtomography combined with X-ray attenuating dopants is used to obtain 3D images of the pore network and to resolve phase distributions in the pore space.