地震预警现地PGV连续预测的最小二乘支持向量机模型   总被引：2，自引：0，他引：2       下载免费PDF全文

宋晋东  余聪  李山有 《地球物理学报》2021,64(2):555-568

为提升现地仪器地震烈度预测的准确性与连续性,研究面向地震预警的PGV连续预测模型.以中国仪器地震烈度标准的计算参数:0.1～10 Hz带通滤波三分向矢量合成速度峰值PGV为预测目标,利用日本K-net与KiK-net台网P波触发后1?10 s强震数据,基于人工智能中的机器学习方法-最小二乘支持向量机,选取7种特征参数作...  相似文献   

Advances in understanding of the mechanism for generation of earthquake thermal precursors detected by satellites     

Arun K. Saraf  Vineeta Rawat  Swapnamita Choudhury  Sudipta Dasgupta  Josodhir Das 《International Journal of Applied Earth Observation and Geoinformation》2009

Stresses building up during an earthquake preparation phase also manifest themselves in the form of a so called increased land surface temperature (LST) leading to a thermal precursor prior to the earthquake event. This phenomenon has now been validated by our observations of short-term thermal anomalies detected by infrared satellite sensors for several recent past earthquakes around the world. The rise in infrared radiance temperature was seen to vary between 5 and 12 °C for different earthquakes. We discuss in this paper different explanations for the generation of such anomalies that have been offered. Emission of gases due to the opening and closure of micropores upon induced stresses and also the participation of ground water have been propounded as a possible cause for generation of thermal anomalies. Seismo-ionosphere coupling, by which gases like radon move to the earth–atmosphere interface and cause air ionization thus bringing about a change in air temperature, relative humidity, etc., has been put forth by some workers. A mechanism of low frequency electromagnetic emission was tested and experimented by scientists with rock masses in stressed conditions as those that exist at tectonic locations. The workers proposed the positive hole pair theory, which received support from several scientific groups. Positive holes (sites of electron deficiency) are activated in stressed rocks from pre-existing yet dormant positive hole pairs (PHPs) and their recombination at rock–air interface leads to a LST rise. A combination of remote sensing detection of rock mechanics behavior with a perception of chemistry and geophysics has been applied to propose the remote sensing rock mechanics theory. Remote sensing detections of such anomalies confirm so far proposed lab theories for such a hotly debated field as earthquake precursor study by providing unbiased observations with consistency in time and space distribution.  相似文献   

Outburst risk of barrier lakes in Sichuan,China   总被引：2，自引：1，他引：1  

Genwei Cheng  Xiaodan Wang  Xiubin He  Jihui Fan  Jianrong Fan 《山地科学学报》2008,5(3):189-193

34 barrier lakes induced by earthquake have been formed by wedged debris on the river channels after a massive earthquake happening on May 12 in Sichuan, China. Among them, the Tangjiashan Barrier Lake is the largest one. It faces very urgent risk of dam breaking when water level reaches the top and begins overflow in case of storm rainfalls and continually aftershocks, threatening already devastated cities and villages with about 1.5 million people downstream. The outburst of a similar barrier lake occurred in the Minjiang River in 1933, causing a catastrophic flood. Risk analysis indicates that not all barrier lakes are highly dangerous. Only those lakes with very high dams and water to be filled up in short period need to be dealt with immediately.  相似文献   

基于遥感和GIS的建筑物震害损失评估方法研究与实现   总被引：9，自引：0，他引：9  

王龙  王晓青  丁香  窦爱霞 《地震》2007,27(4):77-83

介绍了一种使用遥感技术进行震后损失快速评估的方法,评估流程包括震害提取和损失评估两个部分。评估方式根据需求可以分为基于震害指数的评估和基于图像分类结果的评估两种模式,前者通过震害指数与烈度的关系得到地面居民住地的宏观震害情况,结合地震应急数据进行建筑物损失评估;后者采用图像处理技术,选取典型震害样本以图像分类技术得到地面居民住地的分级分类的震害结果,然后计算参数进行损失评估。损失评估的计算根据震害提取模式而不同。这种遥感震害评估方法和计算流程结合了遥感和GIS技术,以满足实际工作需求目标,提高了震害提取的自动化程度,实现多人工作模式,通过有效率的人机交互来提高遥感震害评估的速度。  相似文献   

河北省地震局行政值班管理系统的设计与实现     

茅远哲  马旭东  李振波 《山西地震》2021,(1):46-49

近年来,各级党委政府全面推进机关事业单位值班工作制度化、规范化和标准化,地震系统行政值班人员数量、频次、要求越来越高,责任越来越大.针对河北省地震局行政值班工作的人工管理现状,科研人员结合当前值班规则与工作需求,设计开发一套河北省地震局行政值班管理系统,通过模块实现在线自动排班换班、实时更新排班情况与值班次数统计等功能...  相似文献   

Was LUSI caused by drilling? – Authors reply to discussion     

Nurrochmat Sawolo  Edi SutrionoBambang P. Istadi  Agung B. Darmoyo 《Marine and Petroleum Geology》2010

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甘肃中东部地震滑坡灾害的机制与预防     

宋利萍  沈克金 《高原地震》2007,19(3):50-53

通过对甘肃中东部大量地震滑坡的成灾机制分析,按形成时代将滑坡分为新滑坡、老滑坡和古滑坡;按物质组成、滑体厚度及滑床位置又可分为浅层黄土滑坡和深层切层滑坡。该地区地震滑坡的主要危险来自新滑坡和浅层黄土滑坡,滑坡成灾机制复杂,与许多因素有关。地震滑坡主要特征是成灾时间短,规模大;灾害持续时间长、反复性大;易引发次生灾害。预防地震滑坡是防震减灾工作中的一项重要任务。  相似文献   

层式滤波隔震垫     

娄霓  靳树才 《高原地震》2007,19(4):55-60

根据震相图展示的地震波运动规律,利用滚动摩擦阻力只相当滑动摩擦阻力1／40～1／60的力学效应,将轴承钢球呈层状重叠组合成隔震垫,可获得重复滤波效果,能高效降低地震对房屋建筑的作用力,达到提高地震安全度,降低建筑成本、节约建筑资源的目的。  相似文献   

区域数字地震台网实时速报系统研究   总被引：8，自引：2，他引：6  

金星  廖诗荣  陈绯雯 《地震地磁观测与研究》2007,28(1):64-72

根据我国地震监测台网的发展趋势,提出了区域数字地震台网实时速报系统的发展目标,研究了实现这一目标应解决的实时数据流接收、震相自动识别、震相可靠性处理、实时地震定位、震相到时等值线实时绘制、地震震级的实时计算、地震动强度分布图的实时绘制等问题.我们编制了一套实时地震速报软件,实现了上述功能,并用福建数字地震台网记录的地震事件进行软件功能测试.测试结果表明:对于网内地震,软件处理结果基本达到中国地震局地震速报评比满分的要求,速报时间缩短至30～50 s.此外,通过实时仿真技术,系统可给出实际观测到的PGA、PGV、PGD等值线图,可以为应急救灾确定重灾区和有感范围提供帮助.  相似文献   

Earthquake hazard in Jordan     

Robert L. Kovach 《Natural Hazards》1988,1(3):245-254

An estimate of the maximum macroseismic intensities and ground accelerations which might be expected for the Hashemite Kingdom of Jordan is made. The inferred maximum magnitudes lie in the range of 6.1 to 7.3 although the possibility that larger earthquakes can occur with long recurrence times cannot be precluded. Peak horizontal accelerations in the range of 0.4 to 0.5 g can be expected in Jordan. Probabilistic estimates indicate that the odds are about even (50-50) that an earthquake with a magnitude of at least 6 will occur within 80 years.  相似文献