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本文介绍了姑咱FSO型倾斜仪的观测条件和精度。同时,利用日均值矢量、一阶差分和契氏拟合残差计算表明,姑咱倾斜在1988、1989年的四川道孚八美、巴塘、小金和石棉强震前都出现了不同程度的前兆异常反应。 相似文献
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前言 1976年8月16日松潘7.2级地震前6天,姑咱水氡出现了引人注目的单点突跳异常,四川省地震局据此对松潘7.2级地震作出了较好的临震预报;因此,姑咱台水氡的观测成果,引起了国内外地震界的关注。不少人以姑咱水氡单点突跳异常为依据发表了文章。笔者经过对原始观测数据的分析处理,认为姑咱水氡单点突跳变化不是地震前的临震前兆异常,而是观测中的一种随机误差。 相似文献
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一、前言1989年11月20日重庆江北统景连续发生5.2级和5.4级地震。重庆台JB倾斜仪距震中仅50千米。对重庆台倾斜仪1987~1990年的观测资料进行了整理,分析了有关图件,发现此次地震前,不但有中期异常,而且也有较好的短临异常。NS、EW分量都从1989年2月中旬开始打破年变规律、年变幅超过往年,月均值矢量图也出现中期异常;NS分量从1989年10月18日开始出现倾斜固体潮畸变和不规则波动的短临异常。二、观测资料异常及分析1.中期异常:重庆台从1985年6月恢复观测后,每年的观测值有较好的年变。从图1可以看出,图1重庆合JB地倾斜日均… 相似文献
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西昌43—8井是位于西昌断陷盆地昔格达层中的一口45米深的地震观测专用井,采用连续自记仪进行水位观测,平常反映大气降雨和固体潮的变化。木里地震前四个月现打破正常年动态周期变化的中期异常,震前几天的固体潮曲线被破坏,水位突然上升6厘米。 相似文献
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强震前地电阻率异常的模糊识别 总被引:2,自引:0,他引:2
本文用模糊集从属函数方法,对1976年唐山7.8级地震和宁河河6.9级地震前华北地区20多个台站的地电阻率观测数据和1988年澜沧——耿马7.6级地震前腾冲台地电阻率观测数据以及1989年巴塘6.7级地震前甘孜台地电阻率观测数据进行了计算,共计处理5500多个数据,从中提取了中期趋势与短临异常,并对唐山地震前地电阻率异常进行了概略分析。 相似文献
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1998年1月10日河北省张北6.2级地震前,距震中100km的内蒙古宝昌地震台石英倾斜仪NS分量自1996年7月出现向南倾斜的趋势异常,EW分量1997年8月向西倾斜的短期异常,并在地震发生前6天之内,倾斜仪固体潮曲线上出现多次阶跃式畸变,可能是张北6.2级地震的临震前兆。与此同时,该台站的地电阻率也在震前2.5个月出现短期异常。 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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