共查询到20条相似文献,搜索用时 46 毫秒
1.
2.
中等地震对华南中强地震的指示意义 总被引:1,自引:1,他引:1
研究了华南地区14次中强地震前中等地震活动特征,据此提出了本区中强震短期预测判据:中期(或中短期)中等地震累积频度呈指数(加速)增长,短期至发震中等地震持续平静(通常小于3个月)。 相似文献
3.
用统计学上的χ~2检验方法对华东地区M_L≥4.0地震平静进行了统计检验,得出在较高的置信概率下可以将平静时间T≥140天作为平静异常的判别标准。总结了华东地区自1970年以来出现的平静异常,并分析了其对应中强地震的情况。研究表明,M_L≥4.0地震平静异常是华东地区中强震前的一种普遍现象。62.5%的平静异常后发生了M_S≥4.5地震;绝大多数平静异常前存在着地震活动的增强过程,多次活动增强后连续发生了平静异常且之后发生了M_S≥5.0地震。 相似文献
4.
华南地区地震活动特征与台湾强震影响 总被引:1,自引:0,他引:1
以Ms5.5以上地震是否发生为标记,划分华南地区的活跃和平静时段,结果显示与华南地区2级以上地震频次的应力调制时间过程变化趋势有很好的一致性。另外,在活跃和平静时段华南地区的震级频次特点显不同。华南地区在中强震发生前有4级左右地震频繁活动和小震群频发的特点。华南地区的中强震与云南地区7级地震的发生相关。统计20世纪以来台湾强震与华南中强震的对应关系,台湾西带6级强震后1年内华南中强震的对应率近0.5,地区影响似有由东至西逐渐减弱的趋势。台湾7级地震后2年内华南中强震的对应率只有0.3,对应地区除台湾海峡、福建和广东东部地震外,也有几次对应广西和北部湾地区的地震,与6级相比,台湾7级强震影响范围大。 相似文献
5.
从大震前中小地震活动的增强过程和大地震常常发生在异常区外围的现象出发,提出用描述地震分布时、空、强基本特点的空间集中度C、地震危险度D和地震强度因子Mf进行交汇预测未来中强地震,应用于华南地区的震例一般预测半径范围为2°,并总结了综合异常的中短期特征. 相似文献
6.
本文取1962至1990年12月广东省新丰江地震的余震序列资料,从应变释放的角度定量地分析新丰江的余震活动特点以及与华南地区中强地震活动的关系,并与理论分析结果对比。发现新丰江地震的余震应变释放过程具有4次明显的应变异常增加,而且,从新丰江地震以来,华南地区发生的所有5.0以上中强地震都与新丰江余震应变释放的明显异常增加相“联系”,新丰江余震震群的出现是华南地区构造应力场增强的背景下余震区应力加强的效应,可以起到监视华南地区5.0级以上中强地震的“应力窗口”作用。从1986年以来,新丰江地区的余震活动有所加强,其应变释放明显增加,表明华南地区的构造应力场在加强,其地震活动可能达到较高的水平。 相似文献
7.
8.
9.
结合2021年度地震活动性异常,系统梳理门源6.9级地震前祁连山地震带5级地震平静打破和祁连山中东段ML3.6地震平静打破的时空异常特征,认为祁连山地震带5级地震平静对平静区及周边发生6级以上地震具有指示意义,祁连山中东段ML3.6地震平静对祁连山中东段5级以上地震有良好的对应关系。平静区的打破使中强地震发震的时间紧迫性进一步增强,一般在平静打破后一年发震。文章详细总结了两项指标的预测意义,并对其做了系统的预测效能评估,为后续强震危险性研判提供了参考经验。 相似文献
10.
利用极限时间法对云南省1970年以来Ms≥6.5 11组强地震进行h′值计算,结果显示:11组强震前出现h′值异常,表现为不同程度的大幅(平均减幅达28%)突然减小现象,即地震活动出现异常平静的现象,可成为地震预报意见的关键指标;强震前出现8次地震活动增强一平静一主震的发震模式,占73%,出现3次增强一平静一增强(短期内)一主震的发震模式,占23%;h′值量板图对强震前的地震活动平静和地震活动增强现象展现得较为清晰;通过对11组强震进行预测,预测时间约为5个月。 相似文献
11.
12.
M. N. French R. L. Bras W. F. Krajewski 《Stochastic Environmental Research and Risk Assessment (SERRA)》1992,6(1):27-45
A procedure for short-term rainfall forecasting in real-time is developed and a study of the role of sampling on forecast ability is conducted. Ground level rainfall fields are forecasted using a stochastic space-time rainfall model in state-space form. Updating of the rainfall field in real-time is accomplished using a distributed parameter Kalman filter to optimally combine measurement information and forecast model estimates. The influence of sampling density on forecast accuracy is evaluated using a series of a simulated rainfall events generated with the same stochastic rainfall model. Sampling was conducted at five different network spatial densities. The results quantify the influence of sampling network density on real-time rainfall field forecasting. Statistical analyses of the rainfall field residuals illustrate improvement in one hour lead time forecasts at higher measurement densities. 相似文献
13.
14.
George W. Housner 《地震工程与工程振动(英文版)》2008,7(2):I0001-I0001
Destructive earthquakes have caused great damage in China and the United States and collapsing buildings havecaused many deaths and injuries. The field of earthquake engineering studies earthquake hazards, the occurrence ofearthquakes of various magnitudes, the nature of the ground shaking during an earthquake, the vibration of structuresduring earthquakes, the strengthening of existing structures and the design of new structures to be earthquake resistant,and finally, how to cope with earthquake damage and restore a city to normal functioning. Such efforts are in progressin both countries, but unfortunately, the language barrier interferes with the free flow of information between China andthe Untied States. It would be mutually beneficial if some means could be developed to promote the exchangeof information across the Pacific Ocean. This new journal has been established for this purpose and its success willbe an important step in promoting earthquake engineering in China and the United States. 相似文献
17.
JianCheng Shi 《中国科学:地球科学(英文版)》2014,57(10):2281-2282
正Global Change includes climate change and other environmental changes caused by the joint interaction among various layers of Earth. From the positive side, global change provides new opportunities to human and other living forms on Earth. In the meantime, it creates tremendous challenges and negative impact. At present, the negative impacts have reached all primary processes of the global ecosystem and every aspect of human society, especially causing degradation of the ecosystem. For instance, intensive deforestation causes decline of biodiversity; global warming causes sea level rise and increases 相似文献
18.
《国际泥沙研究》2014,(4)
正President:Giampaolo Di Silvio,Italy Vice Presidents:Ulrich C.E.Zanke,Germany Zhao-yin Wang,China The World Association for Sedimentation and Erosion Research(WASER),inaugurated on Oct.19,2004,is an independent non-governmental,non-profit organization.The mission of WASER is to promote international co-operation on the study 相似文献
19.
《地震工程与工程振动(英文版)》2014,(4)
正This journal is established by the Institute of Engineering Mechanics(IEM),China Earthquake Administration,to promote scientific exchange between Chinese and foreign scientists and engineers so as to improve the theory and practice of earthquake hazards mitigation,preparedness,and recovery.To accomplish this purpose,the journal aims to attract a balanced number of papers between Chinese and 相似文献