潮州台地下水化学异常与地震的关系

潮州台地下水化学异常与地震的关系黄国铭（潮州市地震局，潮州５２１０１１）潮州水化观测井位于北东向的三饶—潮州—普宁断裂与北西向的韩江断裂的交汇处，围岩为燕山期花岗岩，井深５１．３ｍ，为花岗岩微承压水，水温常年平均在２４℃左右，水质为ＨＣＯ３－—Ｃａ＋...     

安徽香泉台气氡映震能力分析

安徽省香泉台为地震地下流体综合台,2000年1月进行了数字化改造,现有气氡、动水位、水温等数字化测项. 香泉台观测井,位于郯庐断裂带以东,下扬子破碎带西侧,和县北大断裂带上.温泉出露于淮阳山字形构造前弧东翼、含山挤压褶皱带上的龙王山-南龙山背斜中段、锅底山东北麓的上寒武纪仓山灰岩断裂带内.作者邮箱:陶月潮,taoych@126.com     

江苏流体井网水位对青海玛多7.4级地震同震响应特征差异及原因分析

本文收集整理江苏流体井网对青海玛多7.4级地震同震响应水位资料、各流体井基本参数资料和井周边构造资料,分析同震响应特征和特征差异,探讨差异原因.资料显示,27口观测井中17口井水位出现同震响应;响应类型分振荡型和阶跃型两类.对于不同观测井,震级与震中距不是影响同震响应幅度的主要因素,井孔位置是否位于断裂带上或者断裂带附...     

丰满台水氡异常特征分析

利用丰满台吉丰井1986—2016年的水氡观测资料,分析其动态变化特征,并研究了丰满台水氡异常与地震活动的对应关系,结果显示:大部分异常的出现与消失在时间上与东北及华北的中强地震以及西太平洋地震带北段等地区的强震活动相关联,映震效果较好。研究结果可为今后利用丰满台水氡异常资料进行地震预报提供依据。     

流量的周期分析和潮汐判别

1979年,湖南大学在距长沙地震台一百多米处钻了一口饮水井,因水量不够,未曾利用。长沙地震台从1981年开始,用该井作为地震地球化学观测井。该井位处长沙—平江盆地南端,长寿—永安断裂带北西侧,座落在岳麓山背斜的东翼。井深274米,53米以上套管护壁,阻隔地表水直接渗入井中。该井揭露96—128     

四川姑咱台的探震能力初探

引言 姑咱台位于四川省甘孜藏族自治州的康定县境内(102°10′ E,30°06′ N),属国家Ⅱ类测震台.该台处于北西向的鲜水河断裂带、北东向的龙门山断裂带和北南向的安宁河断裂带复合部位靠北的地段,是四川西部监视地震活动的重要窗口之一,见图1.台基岩性为斑状黑云母花岗闪长岩,海拔高度为1450m.     

西昌李金堡古地震遗迹的鉴定及其意义

西昌位于安宁河断裂带与则木河断裂带的交汇部位,此处是川滇菱形断块东侧边界活动断裂的拐点,同时还有近东西向构造的穿插切割。自公元625年以来共发生M≥4 3/4级地震8次,其中Ⅹ度二次,Ⅸ度一次,Ⅶ—Ⅷ度二次,是我国著名的强震区之一。     

长沙井动水位的记震能力及其初步分析

井孔的基本情况 长沙地震台动水位观测井(简称长沙井)是1979年钻的供水勘探井,1981年列为我台地震观测井,进行流量和部分水化学成分的观测,1985年初增上动水位观测。 从区域构造上看,长沙井位于南华准地台的湘中湘南加里东印支穿插褶皱带的韶山坳陷和幕阜山隆起交界部位,在长沙—平江中新生代盆地边缘、长寿—永安大断裂北西     

晋冀鲁豫交界地区地震地质条件

晋冀鲁豫交界地区是华北地块一级构造单元。该单元处于太行山断块、冀鲁断块、皖豫断块的交汇部位,是北东—北北东向的太行山山前断裂带、沧东—聊考断裂带与北西向的磁县—大名断裂、新乡—商丘断裂的扭结区,并构成以内黄隆起为中心的,西、东两侧隆起,北、南两边沉陷的鞍状构造。从新构造活动及地震震源机制分析得出:本区自第三纪末—第四纪以来受北东东—南西西方向的区域主压应力的控制,故新构造活动在保留原有升降运动的基础上,以水平扭动为主,并伴有掀斜升隆及块体的框动。本区地震活动呈显明的条带分布,明显地受太行山山前断裂带及沧东—聊考断裂带的控制,构成太行山东麓地震活动区及沧东—聊考地震活动区。而北西西向断裂的切错常成为具体的发震条件。可能由于内黄隆起块体的框动的影响,本区重要的强震及中强震围绕着它呈中心对称分布。     

三马坊地热动态观测对附近地震活动的反应

1988年10月,国家地震局地壳应力研究所在河北省阳原县三马坊温泉疗养院安装一台用于地热前兆观测的温度计。该测点(北纬40.2°,东经114.6°)地处北东向桑干河断裂带和北北西向化稍营断裂的交汇部位(图1)。观测井深200米,井孔封闭良好,井水自流。测温探头位于水面以下10多米处。所使用的观测仪器,是地壳应力所付子忠等研制生产的SZW-2型高精度数字式石英温度计。其测量温度的范围为0—99.9999℃,测温分辨率为0.0001℃。     

A Monte Carlo study of rainfall forecasting with a stochastic model

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.     

Earthquake Engineering and Engineering Vibration Aims And Scope

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     

Foreword

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.     

WORLD ASSOCIATION FOR SEDIMENTATION AND EROSION RESEARCH(WASER)

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     

Enhancing remote sensing research on global change to improve our understanding on Earth system processes

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     

Dissolved Carbohydrate Concentration,Composition, and Bioavailability to Microbial Heterotrophs in Stream Water

Dissolved total carbohydrates (DTCH), dissolved free monosaccharides (DFMS), dissolved organic carbon (DOC), biodegradable DOC (BDOC), and humic substances (HS) were measured in White Clay Creek (WCC), a stream in southeastern Pennsylvania Piedmont, USA. Samples were collected over different seasons and under baseflow and stormflow conditions. DOC concentrations ranged from 1.0 to 12.8 mg/L C with the highest concentrations associated with stormflows. Carbohydrates ranged from 0.42 to 12.4 μM and accounted for 2.9 to 12.7% of the DOC. Humic substances represented the major DOC fraction, accounting for 55 to 72% of the DOC pool under all flow conditions. The humic fraction had a lower carbohydrate content (4.4%) than the non-humic fraction of DOC (7.2%). Stormflow DOC was enriched in carbohydrates relative to baseflow DOC, but the percentage of humic-C changed little. Carbohydrates were primarily present as dissolved polysaccharides (55%), but a significant fraction was bound to humic substances (40%), while a small proportion was present as monosaccharides (5%). The major monosaccharides in stream water, listed in order of decreasing concentration, included glucose, galactose, rhamnose, xylose, arabinose, mannose, and fucose. On average (30.6 ± 7.4)% (n = 44) of the stream water DOC was biodegradable, and carbohydrates accounted for 9.9 to 17.7% of the BDOC.