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介绍了体应变观测潮汐因子和勒夫数 h2 之间的线性关系 ,h2 的变化幅度较体应变观测潮汐因子震前异常变化大 7.5倍。同时 ,昌平台剪应变观测潮汐因子 O1波与体应变观测潮汐因子M2 波震前异常有较好的一致性 ,研究钻孔应变观测潮汐因子的变化有可能是取得地震前兆的有效途径之一。 相似文献
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甘肃省东部地区的潮汐测量结果及其地球动力学意义 总被引：3，自引：2，他引：3
文中介绍甘肃省东部地区1985年以来在重力、倾斜、水平应变和水位等固体潮方面的测量概况,给出了各台(项)全系列观测资料作整体调和分析计算的潮汐参数,分析了液态地核共振效应对重力、水平线应变和水位固体潮周日波潮汐因子的影响以及地壳构造横向不均匀性对倾斜固体潮潮汐因子的影响。结果表明,兰州重力仪、石英水平伸缩仪和甘06井等水位井的结果清楚地显示出液核共振效应对K_1波振幅的缩小作用和对ψ_1波振幅的放大作用,且重力和伸缩仪NS向结果所揭示的地球模型更接近莫洛金斯基的地球型Ⅱ;倾斜固体潮潮汐因子的实测结果明显地受地壳构造横向不均匀性影响,其中水管倾斜仪受影响的程度又明显地大于水平摆倾斜仪,兰州和宕昌两地南北向的非均匀性明显大于东西向,而宕昌地区的非均匀性又明显大于兰州地区。 相似文献
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地壳应变场常用钻孔体应变仪进行测量,而周期为几分钟到几小时的短周期气压波是影响体应变仪工作的一种长期因素.本文以Evertson等人推导的体应变短周期气压干扰模型为基础,从理论上进一步探讨了体应变气压影响系数与气压周期、岩石弹性参数和井孔深度的关系及变化规律.由于体应变观测井孔存在耦合效应,又建立了大气压垂直载荷作用下观测井孔耦合系数计算方程,比较了在多重因素作用下体应变气压影响系数理论观测值与无孔岩石真实值之间的差异,并与涞水、顺义、东三旗和昌平台的Sacks体应变实际观测资料进行了比对分析.这对地震前兆微动态信息背景场的探索具有实际意义. 相似文献
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剔除库尔勒体应变观测资料中地震波、仪器标定及明确原因的干扰数据,计算应变潮汐因子、高频信息和非潮汐速率,结果显示：O1波、半日波潮汐因子在轮台5.4级、新源-和静交界6.6级地震前存在明显的异常反应,潮汐因子曲线形态、周期均发生明显的异常变化,异常结束后2-3个月内发震.总结体应变观测资料的异常特征,可有效捕捉前兆异常变化信息,有助于提高台站的地震短临预报水平. 相似文献
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《地震地磁观测与研究》2015,(4)
对连云港地震台钻孔体应变2009年1月—2013年12月数字化观测资料与气压、水位、降雨的影响进行相关分析,并进行潮汐因子M2波、周日波变化分析,获得地震前形变临震异常特征。结果表明:1气压变化以短周期正相关干扰为主,在时间上表现为准同步变化;体应变和水位变化具有较好的准同步性;降雨过程、降雨量及降雨时间等与体应变密切相关;2当地下介质性质发生变化时,固体潮发生畸变,潮汐因子变化可作为取得地震前兆的有效途径之一。 相似文献
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Shao-Xie Xu 《地震学报(英文版)》1993,6(2):517-533
The method of prediction of earthquake by using seismisity (MPES) is to make use of the message of earthquakes (including
large, middle, small) in pre-period to predict large earthquake in post-period. Some better methods are presented in this
paper which are selected among many means used in our country recent years. These methods are classified into six sets: 1.
Method of spatial pattern; 2. Method of time process; 3. Method of seismic sequence; 4. Method of earthquake correlation;
5. Method of parameters of seismic source and medium; 6. Comprehensive method. Prediction effects of each method are evaluated
with unique score. The value of each method, scoreR, are generally in a range between 0.3 and 0.6. This value only represents internal consistency, however, the ability of actual
prediction belongs to the extensional effect, which is generally lower than the value of internal consistency. If the ability
of actual prediction could be evaluated withR = 0.3, the ability of prediction of earthquake by seismicity will be stated as following: If most of earthquakes must be
predicted, the warning time needs to take seventy percent of whole time period of prediction; If half earthquakes must be
predicted, the warning time needs to take twenty percent of whole time period of prediction.
The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 239–252, 1993. 相似文献
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1993年地震学期刊发文统计及引文分析 总被引：1，自引：0，他引：1
笔者统计了全国地震系统１９９３年度９种期刊发文量，对９种期刊的论文引文做了初步分析，内容包括；发表论文分布、引文数量、引文语种、引文类型、被引作者，论文多年产作者、引文年代及论文专题分类。 相似文献
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高速铁路路基动土压力测试信号的小波分析 总被引：3，自引：0，他引：3
阐述了小波分析的基本原理与方法,选用Daubechies小波对某高速铁路路基土压力的现场振动测试信号进行分析处理。由此对高速列车荷载作用下,路基动土压力产生的机理及其土压力的构成进行较深入的研究。 相似文献
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A.T. Silva 《水文科学杂志》2013,58(5):942-955
Abstract The method of fragments is applied to the generation of synthetic monthly streamflow series using streamflow data from 34 gauging stations in mainland Portugal. A generation model based on the random sampling of the log-Pearson Type III distribution was applied to each sample to generate 1200 synthetic series of annual streamflow with an equal length to that of the sample. The synthetic annual streamflow series were then disaggregated into monthly streamflows using the method of fragments, by three approaches that differed in terms of the establishment of classes and the selection of fragments. The results of the application of such approaches were compared in terms of the capacity of the method to preserve the main monthly statistical parameters of the historical samples. Editor D. Koutsoyiannis; Associate editor C. Onof Citation Silva, A.T. and Portela, M.M., 2012. Disaggregation modelling of monthly streamflows using a new approach of the method of fragments. Hydrological Sciences Journal, 57 (5), 942–955. 相似文献
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首都减灾圈,系首都减轻自然灾害预测防治圈。1991年12月20—21日在北京召开了《首都圈自然灾害及其减灾对策研讨会》。本文根据这次会议所提供的材料,在从整体上实现减灾的思想指导下,就首都减灾圈的“成灾背景”、“首都减灾圈的组成”、“首都减灾圈的灾害预测与防治状况”、“首都减灾圈的灾害关联性分析”、“首都减灾圈的减灾实效预估”和“首都减灾圈的减灾对策与实施”等六个带有共同性的问题,进行了讨论。供制定首都圈减灾方案时参考。 相似文献
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M. J. Manton 《Pure and Applied Geophysics》1977,115(3):547-559
Summary The motion of an aerosol can be described by a general force balance equation, independent of the detailed structure of the flow, provided that the interaction between the external flow field and the local flow induced by the aerosol is weak. A necessary and sufficient condition for the interaction to be weak is that the length scale of the aerosol is much less than that of the external flow. High and low Reynolds number regimes can be distinguished for the motion of an aerosol relative to the external flow. In some extreme conditions the equation of motion reduces to an algebraic equation for the aerosol velocity.After submission of this article the author was made aware of a similar treatment published inTopics of Appl. Phys., 12 (Turbulence, Chapter 7), Springer Verlag, Berlin, which at the time of the article's submission had not yet appeared in Australia. (Ed.) 相似文献
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