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本文对福建数字地震台网98年7月至9月记录到的全部地震与非地震事件作初步统计,并扼要介绍其分析处理情况。 相似文献
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福建数字地震台网扩建工程于二一年年底完成了五个数字遥测台站的土建和建筑装修工程 ,接着进行了太阳能电池和避雷接地的施工架设 ,通信线路的申请、开通及地震仪器安装、调试。二二年元月五个台开始并网试运行 ,2月 1日至 4月 30日进入考核运行 ,之后又正常运行了三个月 ,7月30日省地震局科技监测处组织有关专家 ,对地震台网扩建工程进行测试尔后召开了验收会。福建省数字地震台网扩建工程是福建省地震重点监视防御区城市防震减灾体系工程的重要组成部分 ,是针对我省目前部分地区地震台站密度较稀的现状 ,为提高地震监测能力 ,进… 相似文献
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本文根据我国地震监测台网的发展趋势,提出了区域数字地震台网实时速报系统的发展目标,着重研究了实现这一目标应解决的实时数据流接收、震相自动识别、震相可靠性处理、实时地震定位、震相到时等值线实时绘制、地震震级的实时计算、地震动强度分布图的实时绘制等问题。我们编制了一套实时地震速报软件,实现了上述功能,并用福建数字地震台网记录的2000至2004年网内ML≥2.5共69个地震事件进行软件功能检测,结果表明网内地震三要素的速报能力,由目前的8分钟左右缩短至30至50秒;与月报目录相比,99%的地震震级误差小于0.2级,1%的地震震级误差在0.3至0.4级;97%的震中误差小于5公里,3%的误差在5至10公里,完全满足地震速报的要求。此外,通过实时仿真技术,系统还可给出实际观测到的PGA、PGV、PGD等值线图,这可为应急救灾确定重灾区和有感范围提供帮助。 相似文献
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本文对 1 999年 1月至 2 0 0 0年 1 2月福建数字地震台网测定的台湾地区ML≥ 5 .0级地震 (9.2 1地震序列取ML≥ 5 .5级地震 )测定了Ms震级 ,并将福建台网测定的ML、Ms震级与中国地震局分析预报中心测定的大震速报Ms震级进行了比较。 相似文献
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小浪底水库遥测地震台网建设技术探讨 总被引:1,自引:1,他引:1
本文阐述了小浪底水库遥测地震台网建设过程中的有关技术问题, 对总体设计、基本建设、设备选购、配置及安装调试等各个阶段的技术难点、重点, 进行了全面剖析, 提出了自已的见解, 对水库遥测地震台网的规划和建设具有一定的指导意义。 相似文献
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地震科学某种意义上是一门观测科学。没有精确、可靠的地震观测资料,地震预报及相关的地球科学研究就缺乏基础。目前,越来越多的国家,尤其是主要的多地震国家都在大力发展大动态、宽频带、高精度的数字地震观测台网。西太平洋很多国家也正在计划加强或建立新的数字地震台网。本综述根据1998年西太平洋地球物理会议《地震台网》专题会议的上交流的论文,介绍了该地区数字地震台网的建设及其某些应用的概况。 相似文献
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5.12汶川特大地震后,为了监测地震的发展趋势,探讨大范围的构造应力场作用,在龙门山断裂带上及时布设临时数字地震台网。数字台网由11个数字地震台组成,遍布龙门山断裂带的北东缘和南西端。为了分析WFSD数字地震台网监测能力及其动态范围,随机抽取一定数量台站观测数据,通过傅立叶变换和功率谱密度分析,获得台基地动噪声均值,进而分析观测系统的动态范围和台网监测能力。根据计算结果与记录的大量微震对比研究,表明在龙门山断裂带上,WFSD数字地震台网具有监测ML 1.5级微地震的能力,且与中国地震局台网中心发布的地震结果基本吻合。因此,WFSD数字地震台网可为龙门山断裂带变形机制研究提供基础的观测资料。 相似文献
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20 0 2年 7月福建省地震局成立应急救援处。之后 ,福建各级政府先后建立了破坏性地震应急指挥机构。 2 0 0 3年 8月 ,福建省地震局、福建省公安消防总队和福建省武警医院三方就联合组建福建省地震紧急救援队事宜达成共识 ,并已联合行文向福建省人民政府请示。 2 0 0 4年 ,福建省地震局继续把建立切合实际并行之有效的地震紧急救援工作体系作为工作重点 ,力求地震应急和震灾救援工作实现组织到位 ,人员到位 ,措施到位 ,制度到位。 相似文献
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河道水流运动过程特别是洪水演进过程是一个复杂的非线性动力学过程,鉴于神经网络具有很强的处理大规模复杂非线性动力学系统的能力,本文将神经网络理论用于河道水情预报的研究,以期识别水流运动变化过程与其影响因子之间的复杂非线性关系,为河道水情预报提供了一条新的途径。在此基础上建立了螺山站洪水预报的非线性动力学模型,通过分析研究得出近年来特别是1998年长江中游出现的小流量高水位现象与螺山汉口河段累计淤积有关并得到螺山站水位变化与河床淤积之间的定量关系。 相似文献
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Modelling of shear behaviour of residual soils is difficult in that there is a significant variability in constituents and structures of the soil. A Recurrent Neural Network (RNN) is developed for modelling shear behaviour of the residual soil. The RNN model appears very effective in modelling complex soil shear behaviour, due to its feedback connections from an hidden layer to an input layer. Two architectures of the RNN model are designed for training different sets of experimental data which include strain-controlled undrained tests and stress-controlled drained tests performed on a residual Hawaiian volcanic soil. A dynamic gradient descent learning algorithm is used to train the network. By training only part of the experimental data the network establishes neural connections between stress and strain relations. Although the soil exhibited significant variations in terms of shearing behaviour, the RNN model displays a strong capability in capturing these variabilities. Both softening and hardening characteristics of the soil are well represented by the RNN model. Isotropic and anisotropic consolidation conditions are precisely reflected by the RNN model. In undrained tests, pore water pressure responses at various loading stages are simultaneously simulated. With a RNN model designed for a special drained test, the network is able to capture abrupt changes in axial and volumetric strains during shearing courses. These good agreements between the measured data and the modelling results demonstrate the desired capability of the RNN model in representing a soil behaviour. © 1998 John Wiley & Sons, Ltd. 相似文献
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Jonathan Levy Gordon Chesters Daniel P. Gustafson Harry W. Read 《Hydrogeology Journal》1998,6(4):483-499
A field study from October 1989 through July 1992, conducted on a 4.1-km2 area in south-central Wisconsin, USA, examined the distributions of atrazine and its chlorinated metabolites in groundwater
and related those distributions to the groundwater flow system. MODFLOW and PATH3D were used to assess bedrock-aquifer susceptibility
to contamination. Estimated travel time from water table to bedrock surface ranges from <0.25 to >512 yr. Spatial distribution
of the estimates demonstrates that increased travel time to bedrock can result from the presence of shallow surface-water
bodies, greater depths to bedrock, and smaller hydraulic conductivities. Estimated travel times to local domestic wells are
inversely related to atrazine and desethylated atrazine concentrations observed in water from those wells.
The potential impact of long-term atrazine use on aquifer water quality was investigated using MT3D in two best-case scenarios.
Uncertainties associated with predicted atrazine concentrations at various depths and times were estimated. For shallow groundwater,
widespread violations of Wisconsin's current preventive action limit were predicted, but with large uncertainty stemming from
uncertain estimates of input parameter values. The simulations indicate, however, that moderate inputs at the water table
are very unlikely to produce violations of Wisconsin's standards deeper in the aquifer.
Received, October 1997 Revised, July 1998 Accepted, July 1998 相似文献
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Speciation and solubility relationships of Al, Cu and Fe in solutions associated with sulfuric acid leached mine waste rock 总被引:3,自引:0,他引:3
Solutions from oxidized waste rock originating from an acid-leached waste dump were studied. The dissolution data suggest
that after the majority of the soluble solid phases are removed, remaining solid phases continued to buffer the solutions
in the acidic pH range. Incorporating the solution data into MINTEQA2 identified controls on the solubility of Al, Cu and
Fe at pH values from about 2.5 to slightly over 5. Sulfate appears to play a significant role in the formation of solubility
controlling solid phases for Al and Cu. This is not the case for Fe, and is suggested that Fe and Cu solubility may be controlled
by cupric ferrite at low pH values.
Received: 5 April 1998 · Accepted: 27 July 1998 相似文献
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本文简述了GPS测量技术 ,重点介绍了福建地壳形变GPS观测网利用GPS定位技术在地壳形变监测方面及其在地球动力学方面的应用 ,并取得了有重要意义的科学成果。 相似文献