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芦山7.0级地震强震动记录及其震害相关性 总被引:4,自引:0,他引:4
2013年4月20日芦山地震中的强震动记录是我国自2008年汶川地震后再一次比较全面地获得的高质量的数字强震动记录。国家数字强震动台网共获得3分量自由场记录114组,成都地震烈度速报台网获得63组。文章对强震动记录进行了常规处理,统计了强震动记录随断层距的数量分布情况,绘制了空间地震动加速度等值线图。结合芦山地震震源机制解和破裂过程研究成果,选取典型记录,分析加速度、速度时程的波形、振幅等特征,识别了此次地震滑冲现象,估算了竖向最大永久位移。通过利用观测数据与国外的地震动预测公式对比,分析了不同周期反应谱地震动幅值及加速度反应谱衰减规律,阐明了此次地震的地震动在近场高频成分较卓越的特点。震后现场考察了3个典型强震动台站附近建筑物震害,分析了地震动与工程震害的相关性,地震烈度的评定反映了地震破坏的程度。 相似文献
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强震动观测仪器面临的机遇和挑战 总被引:1,自引:1,他引:0
本文介绍了国内外强震仪、力平衡加速度计、烈度计、MEMS加速度仪等强震动观测仪器的发展历史与现状,概述了强震动记录中典型异常波形产生的原因和力平衡加速度计的仪器响应误差及校正,建议了解决强震仪器缺陷的措施,分析了强震仪在强震动观测发展中面临的机遇和挑战。研究结果如下:① 进行强震动记录异常波形的研究是有针对性改进现有强震仪存在问题的很好途径;② 早期数字强震仪(力平衡加速度计频带范围0至30Hz)获取的强震动记录应进行仪器校正;③ 应跟踪强震动观测新方法和相关领域新技术,发展MEMS加速度仪和光纤加速度仪等新型仪器。 相似文献
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2008年四川汶川8.0级地震强震动台网观测记录 总被引:8,自引:0,他引:8
本文简要阐述了2008年5月12日在四川汶川发生的8.0级地震中,四川强震台网的记录情况.在"十五"中国数字强震动观测网络分项目完成并通过台网验收后,四川省强震台网获取了该次地震的强地面运动记录,为震害评估和救灾提供了依据,并为四川省今后能获取高质量的强震动记录打下了良好的基础. 相似文献
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对强震动观测的意义,强震仪的发展历史,强震动观测与通常地震观测(测震)的区别,国内外强震动观测的现状以及强震动观测的应用情况进行了论述.此外,对"十五"期间建成的山西数字强震动台网进行了简要介绍. 相似文献
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汶川地震在江苏的强震动记录及地震影响场 总被引:1,自引:0,他引:1
2008年5月12日四川汶川发生M8.0大地震,江苏数字强震动台网固定观测台站、宿迁和溧阳断层观测存放台阵共获取该次地震有效强震动事件45个,计134条加速度记录。本文介绍了这些强震动记录分析处理的基本情况及其时域与频域的一些特点;编写SICalculate谱烈度计算程序和D2InterP二维插值程序,输入所获取的汶川地震26组实测强震动记录数据,得到该次地震在江苏地区的峰值加速度与谱烈度的等值线图,并就区域内地震影响场特征进行了初步研究。 相似文献
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李惠智 《地震地磁观测与研究》2010,31(Z1)
宁夏数字强震动台网观测系统是国家重点建设的防震减灾基础设施项目,由48个数字观测台站和1个强震动台网中心组成.台站采用无人值守方式,利用电话拨号、CDMA和扩频微波以及卫星传输的方式,在台网中心与各强震台之间建立连接,实施远程监控.台网全部采用先进的数字技术,使宁夏强震动观测技术发生了质的变化, 填补了宁夏境内没有固定数字强震台站的空白,大幅度增强了获取近场强震动数据的能力.当宁夏发生4级以上地震时,可以获得多台强震动记录;同时,在监视区范围内发生3级以上地震时,亦可获得多台近场加速度记录,从而为震害快速评估和制定震后应急决策提供可靠依据. 相似文献
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介绍江苏省数字强震动台网布局、强震动仪器观测环境及技术系统组成,并阐述强震动台网运行以及运行设备存在的常见故障和解决措施。江苏省数字强震动台网布局合理、性能稳定、动态范围大,地震记录信息完整可靠,丰富并充实了江苏省强震动数据库,为工程结构的抗震设计及地震工程学研究提供了宝贵的基础数据。 相似文献
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《Advances in water resources》2005,28(7):701-710
The patterns of temporal variations of precipitation (P), streamflow (SF) and baseflow (BF) as well as their nitrate-nitrogen (nitrate) concentrations (C) and loads (L) from a long-term record (28 years) in the Raccoon River, Iowa, were analyzed using variogram and spectral analyses. The daily P is random but scaling may exist in the daily SF and BF with a possible break point in the scaling at about 18 days and 45 days, respectively. The nitrate concentrations and loads are shown to have a half-year cycle while daily P, SF, and BF have a one-year cycle. Furthermore, there may be a low-frequency cycle of 6–8 years in C. The power spectra of C and L in both SF and BF exhibit fractal 1/f scaling with two characteristic frequencies of half-year and one-year, and are fitted well with the spectrum of the gamma distribution. The nitrate input to SF and BF at the Raccoon watershed seems likely to be a white noise process superimposed on another process with a half-year and one-year cycle. 相似文献
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燕郊等测点迁移优化与地磁观测研究 总被引:1,自引:2,他引:1
为优化地磁观测条件,开展了燕郊、夏垫等测点迁移工作;按照测眯迁移原则与实施技术方案,完整地收集并整理了地质构造与地球物理等方面的基本资料;进行了野外实地勘察,磁场梯度的测量,确定了新测点,在新老测点上进行了较长时间的地磁场对比观测;应用多种方法分析研究了地磁对比观测资料,结果表明,新老测点与有关测点的地磁变化具有良好的一致性,并得到了新老测点之间的地磁数据的按点差。 相似文献
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We rederive and generalize hyperbolic moveout formulae for the common-midpoint (CMP) gather and for the zero-offset (ZO) section that can be efficiently used for macro-model-independent reflection imaging in two-dimensional media. The hyperbolic moveout formulae for the common-midpoint gather are obtained from different Taylor series expansions of a particular parametric moveout surface defined in the multicoverage data space. Such a moveout surface involves three kinematic wave-field attributes of two hypothetical waves, which have to be determined by a coherency analysis. By using hyperbolic moveout curves in the CMP gather and in the ZO section one can determine these attributes in two steps. The relationships between the local shapes of the interfaces and the attributes of the hypothetical wave-fields attributes are considered by means of geometrical optics. The determination of these attributes allows to perform a macro-model-independent ZO simulation and a subsequent inversion. 相似文献
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Vindell Hsu Charles E. Helsley Eduard Berg David A. Novelo-Casanova 《Pure and Applied Geophysics》1984,122(6):878-893
A close correlation in spatial distribution of local seismic activity and energy release patterns before and after the 1979 Petatlan, Mexico earthquake suggests heterogeneity within the fault plane of this major low-angle thrust event associated with subduction along the Middle America Trench. A simple two-asperity model is proposed to account for the complexity. Foreshocks and aftershocks of the neighboring 1981 Playa Azul earthquake showed a similar pattern. As both events occurred at the junction of the Orozco Fracture Zone and the Middle America Trench, we speculate that the observed complex fault plane is caused by subduction of the rugged ocean floor of the Orozco Fracture Zone. Short-term precursory seismicity prior to the Petatlan earthquake can be explained by using the asperity model and migration of a slip front from the south-east to the north-west across the main shock source region. 相似文献
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Summary This paper discusses the influence of system stiffness on the dynamic instability of fault surfaces under laboratory conditions for a number of test modes. In conjunction with shear load stiffness, the normal load stiffness, often neglected, is shown to have a considerable effect on the stick-slip process —its presence or absence and its characteristics. Also appropriate stiffnesses are suggested for an earthquake sequence modeled as a growing dislocation. 相似文献
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