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濮阳地震台断层土壤气采气率对气氡观测结果影响的探讨 总被引:1,自引:1,他引:0
地震流体观测在水资源过度开采的形势下,发展断层土壤气观测成为必然趋势.介绍了濮阳台土壤气氡观测的集气、导气装置,对濮阳台土壤气氡模拟观测及数字化观测结果进行分析.模拟观测与数字化观测结果有较大差异,分析产生差异的原因.提出"采气率"这个概念来定量衡量断层土壤气氡观测系统的实用效果.模拟观测和数字化观测结果与"采气率"有较好的对应关系,观测结果表明,集气室体积过大,会造成"采气率"太低,使观测结果偏低,气氡观测结果不适合进行地震前兆观测.在实际工作中, 要通过实验确定采气率的大小,设计合理的集气、导气装置,提高观测质量. 相似文献
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为分析总结地面与井下地震观测系统的特点,以赤峰中心地震台地面与井下观测系统为研究对象,在噪声分析、噪声功率谱分析、地震监测能力和观测动态范围等方面进行分析。结果表明,2套观测系统的RMS均可达到Ⅱ级环境地噪声水平,井下观测系统噪声小于地面观测系统。对2套观测系统的功率谱密度、有效动态范围的对比均表明,井下观测系统的动态范围比地面观测系统超出约10%,因此,井下观测系统地震监测能力优于地面观测系统,井下观测系统能更有效地记录观测数据。 相似文献
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前兆异常判定工作探讨 总被引:1,自引:0,他引:1
前兆观测数据的异常判定和落实是地震分析预报和地震科学研究的一项重要基础工作.前兆异常判定需根据观测对象的物理化学性质、观测仪器工作原理和观测数据正常变化动态背景,对观测环境、观测场地、观测设施和观测仪器等各个环节进行综合分析,排除各种干扰因素的影响. 相似文献
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在对华北北部地热田区自流热水井地下流体前兆观测及现状进行广泛调查的基础上,分析地震地下流体观测井因过度开采热水而引起观测井断流,并由此引发的一系列严重问题。介绍为此采取的测项调整、观测装置改造、观测条件改变、观测环境保护区的划定等各种措施。指出测项调整、观测装置与观测条件改变的有效性与局限性,强调解决问题的根本出路在于观测环境的保护,同时说明当前落实观测环境保护遇到的困难。 相似文献
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针对我国即将发射的电磁监测试验卫星观测物理量和观测频段, 结合我国现有地基观测基础和对比观测需求, 本文提出了地面对比观测系统设计方案, 包括观测对象、 观测频段和观测区域的选取以及台网布局方式. 在此基础上, 根据该方案在甘肃省天祝前兆台阵区域建立了古丰、 寺滩和坪城等3个台站的地面对比观测原型系统, 并取得了电磁场的初步观测资料. 对观测资料的分析结果表明, 地电场和地磁场观测数据呈典型的日变化形态, 具有较好的同步性和一致性, 能够真实地反映小区域地电场和地磁场的变化. 该结果可为今后开展试验性的星地联合观测和建立我国地震电离层立体监测体系提供技术支撑. 相似文献
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土体动力一维非线性本构关系是场地及地基动力响应、土工数值分析的关键。回顾和总结了国内外的发展状况及研究进展,对其分析方法、等幅循环荷载到不规则荷载的扩展及应用规则、试验阻尼比的等效、滞回曲线形状等核心问题进行剖析、评价和探讨,并对各种模型的优缺点进行了比较和讨论,着重介绍了最近研究结果。最后指出未来发展方向及有待进一步研究的问题。 相似文献
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甘肃省地震台网监测能力分析 总被引:1,自引:1,他引:1
何少林 《地震地磁观测与研究》2003,24(6):103-108
讨论了影响台网监测能力的因素,通过对2000年6月~2003年1月甘肃省地震台网产出的地震目录进行分析,给出了甘肃省地震台网监测能力,对台网监测能力弱区进行了划分,提出提高台网监测能力的建议。 相似文献
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SS—Y伸缩仪常见异常现象分析 总被引:1,自引:1,他引:0
针对地震台站SS-Y伸缩仪常见异常现象进行分析判断,给出维护方法,以便于观测、维护人员识别,对地震前兆台站管理人员有一定指导意义。 相似文献
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J. M. Hooke 《地球表面变化过程与地形》1980,5(2):143-157
Measurements of bank erosion on rivers in Devon over a 2½ year period produced mean rates ranging from 0.08 to 1.18 metres per year and a maximum rate of 2.58 metres per year. These values are compared with rates derived from maps for various time periods between 1840 and 1975. The map rates are generally lower than the field rates and the question of whether this difference is due to the method of measurement, the magnitude-frequency of events, a change in discharge conditions or the inherent variation in channel activity is discussed. Published data on bank erosion rates are reviewed and the Devon rates are found to coincide with the worldwide distribution. An analysis of factors likely to influence the spatial distribution of erosion rates reveals a square-root relationship to catchment area and the importance of bank material. Implications of the measured rates for development of flood plains are examined. 相似文献
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段星北 《地震学报(英文版)》1997,10(6):731-741
GeographicaldistributionofhypocentraldepthsofChineseearthquakesXING-BEIDUAN(段星北)InstituteofGeophysical,StateSeismologicalBur... 相似文献
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Debris-covered glaciers are prone to the formation of a number of supraglacial geomorphological features, and generally speaking, their upper surfaces are far from level surfaces. Some of these features are due to radiation screening or enhancing properties of the debris cover, but theoretical explanations of the consequent surface forms are in their infancy. In this paper we consider a theoretical model for the formation of “ice sails”, which are regularly spaced bare ice features which are found on debris-covered glaciers in the Karakoram. 相似文献
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Characteristics of response spectra for long-periods of main-shock recordings of the Chi-Chi earthquake 总被引:1,自引:0,他引:1
Current practice uses predictive models to extrapolate long-period response spectra based on far-field recordings in moderate and weak earthquakes. However, the spectra are not long enough and the data are often not reliable, which means that the seismic design code cannot accurately define seismic design requirements for long-period structures. The near-field recordings in the main-shock of the Chi-Chi earthquake have a large signal-to-noise ratio (SNR), which makes them suitable for studying the long-period acceleration response spectrum up to 20 sec. The acceleration response spectra from 246 stations within 120 km of the causative fault are statistically analyzed in this paper. The influence of distance and site conditions on long-period response spectrum is discussed, and the shapes of the amplification spectra are compared with the standard spectra specified in the seismic design code of China. Finally, suggestions for future revisions to the code are proposed. 相似文献