陕西省地震信息发布系统的研发   总被引：2，自引：0，他引：2  

罗治国  李少睿  赵韬  关昕 《山西地震》2018,(1):43-46

针对陕西省地震台网中心原有的震情信息发送系统对速报的微震需要通过人工输入,影响发送速度和准确度的现状,通过分析地震定位结果文件,整合现有的多种发布手段,基于Mapxtreme开发出一套地震信息发布系统,可自动读取微震信息及正式速报地震信息,实现快速发布震情的目的。  相似文献   

辽宁测震台网台站选取对地震速报定位结果的影响     

李子昊  王承伟  李恩来  安祥宇  梁一婧 《防灾减灾学报》2020,(1):26-32

选取2015-2018年辽宁测震台网记录的10条M_L>2.5的三种类型地震,运用3~20个台站分别对地震进行重新定位,将得出的结果与编目结果进行对比,最终得到一个线性曲线。结果表明,对于网缘地震应选取8~10个台站,网内地震选取5~7个台站进行定位可以保证速报结果的准确和速度。  相似文献   

Experimental investigations into the influence of biofilms and environmental factors on short-term microtopographic fluctuations of supratidal sandstone     

Runjie Yuan  David M. Kennedy  Wayne J. Stephenson  Lluís Gómez-Pujol 《地球表面变化过程与地形》2019,44(7):1377-1389

In this study laboratory experiments were used to explore the role of biofilms, formed by lithobiontic microorganism communities, in causing hourly surface changes of supratidal sandstone and the potential linkage to long-term rock decay. To isolate the influence of individual environmental factors (temperature and humidity) on rock surface changes (expansion and contraction), a colonized (biofilm-covered) and a non-colonized sandstone block (biofilm-free) underwent the same univariate microclimatic simulations closely controlled by an environmental chamber. Simulations were run under three different light conditions, with a natural light lamp on, on and off at 20-min intervals and off, to investigate the impact of light on rock surface dynamics. Measured with a traversing micro-erosion meter (TMEM), two-hourly microtopographic fluctuations of these two sandstone blocks were compared in the same environment. Induced by microclimatic variations, surface movements of significantly higher magnitude (12–120% under varying tempeature and 121–154% under varying humidity) and different change patterns were observed on the colonized block, indicating the primary role of biofilm in driving microtopographic fluctuations of supratidal sandstone. However, thermally driven changes of similar magnitude and pattern were observed on both surfaces, suggesting other mechanisms also operating on the non-colonized rock surface in this process. Due to the sensitivity of biofilm microorganism communities to light, the magnitude and pattern of surface changes was impacted by light condition. Because biofilms increased the magnitude and number of cycles of expansion and contraction of the experimental rock surface, we propose that lithobiontic biofilms facilitate the detachment of grains and granular disintegration on the rock surface, consequently contributing to rock decay and accelerating the rate of breakdown of supratidal rock. This short-term episode therefore needs to be superimposed on longer term studies to fully understand the role of biofilms in rock surface change. © 2019 John Wiley & Sons, Ltd.  相似文献   

新一代区域地震灾害快速评估系统设计与实现——以甘肃省为例   总被引：1，自引：1，他引：0       下载免费PDF全文

陈文凯  周中红  张灿  孙艳萍  张苏平  马小平 《地震工程学报》2020,42(6):1683-1692

破坏性地震发生后,地震灾情快速评估作为地震应急指挥技术系统中的核心模块能够为各级政府和应急管理部门地震应急指挥决策提供重要的信息服务,是地震应急救援与指挥决策重要的支撑平台。随着学者对地震应急领域几十年的研究,已经具备了开发新一代地震灾害快速评估系统的条件。本文基于甘肃省分震级地震烈度衰减模型、分区域的地震灾害人员伤亡评估模型、地震应急专题图设计等研究基础,研发了新一代甘肃省地震灾害快速评估原型系统,实现了软件自动触发、分震级地震影响范围估计、分区地震灾害人员伤亡计算,自动生成地震灾情评估报告,提高了系统的自动化水平和计算结果的精度。该软件能够提升甘肃省地震灾害快速响应能力,能够为甘肃省地震灾害应急救援和指挥决策提供更为科学可靠信息服务。  相似文献   

基于开源软件的地震影响场快速生成及动态修正方法研究与实现     

徐志双  任静  陈雅慧  高小跃  谭专条 《地震地磁观测与研究》2020,41(4):209-216

地震发生后,盲场快速评估阶段生成的地震影响场对极震区的判定和应急救援的实施起着重要的作用。震后依据地震震级、震中所在地区的地震烈度衰减关系和活动断裂分布情况可快速绘制第1时段地震影响场,然后综合考虑此次地震震源的特性,充分利用余震序列、震源机制解等结果可动态修正影响场。本文基于开源软件实现地震影响场的自动生成,并依据余震序列、震源机制解等结果,实现动态修正地震影响场,为震后灾情评估和多时段应急图件产出打下基础。  相似文献   

耐高压高精度快速时间响应温度传感器的封装技术   总被引：2，自引：0，他引：2  

李建国 《海洋技术学报》2004,23(2):50-53,63

文章详细阐述了耐高压高精度快速时间响应温度传感器的设计方法和封装工艺,并给出了温度传感器测试时间响应的方法以及目前达到的水平。对该项技术应用作了介绍。  相似文献   

Salt weathering: influence of evaporation rate,supersaturation and crystallization pattern     

Carlos Rodriguez-Navarro  Eric Doehne 《地球表面变化过程与地形》1999,24(3):191-209

Micro- and macroscale experiments which document the dynamics of salt damage to porous stone have yielded data which expose weaknesses in earlier interpretations. Previously unexplained differences are found in crystal morphology, crystallization patterns, kinetics and substrate damage when comparing the growth of mirabilite (Na₂SO₄. 10H₂O) and thenardite (Na₂SO₄) versus halite (NaCl). The crystallization pattern of sodium sulphate was strongly affected by relative humidity (RH), while a lesser RH effect was observed for sodium chloride. Macroscale experiments confirmed that mirabilite (crystallizing at RH > 50 per cent) and thenardite (crystallizing at RH < 50 per cent) tend to form subflorescence in highly localized areas under conditions of constant RH and temperature. This crystallization pattern was more damaging than that of halite, since halite tended to grow as efflorescence or by filling the smallest pores of the stone in a homogeneous fashion, a result which contradicts Wellman and Wilson's theoretical model of salt damage. Low RH promoted rapid evaporation of saline solutions and higher supersaturation levels, resulting in the greatest damage to the stone in the case of both sodium sulphate and sodium chloride crystallization. At any particular crystallization condition, sodium chloride tended to reach lower supersaturation levels (resulting in the crystallization of isometric crystals) and created negligible damage, while sodium sulphate reached higher supersaturation ratios (resulting in non-equilibrium crystal shapes), resulting in significant damage. ESEM showed no damage from sodium sulphate due to hydration. Instead, after water condensation on thenardite crystals, rapid dissolution followed by precipitation of mirabilite took place, resulting in stone damage by means of crystallization pressure generation. It is concluded that salt damage due to crystallization pressure appears to be largely a function of solution supersaturation ratio and location of crystallization. These key factors are related to solution properties and evaporation rates, which are constrained by solution composition, environmental conditions, substrate properties, and salt crystallization growth patterns. When combined with a critical review of salt damage literature, these experiments allow the development of a model which explains variations in damage related to combinations of different salts, substrates and environmental conditions. Copyright © 1999 John Wiley & Sons, Ltd.  相似文献   

基于DBnet和众筹策略的气象纸质表格快速数字化方法及系统          下载免费PDF全文

韩瑞  李强  顾春利  沈晨笛  石明远 《气象科技》2022,50(2):282-289

气象纸质表格历史资料有很高的科学研究价值和很重要的历史保留意义。数字档案通过数字化的方式将纸质原始资料进行收集、保存和提供各类数字信息资源。本文提出了一种“纸质表格扫描成像”+“图像碎片化处理”+“众筹识别”的快速数字化方法及系统，利用气象大数据资源，应用DBnet模型、DSCC算法等技术对纸质气象表格扫描图像进行图像碎片处理；通过用户的登录行为实现“众筹录入”，完成气象纸质表格资料的数字化档案工作。经验证，快速数字化系统的一录正确率约为99.7%，高于传统数字化人工键入的一录正确率（95.6%）；录入时效比传统数字化提高了22.2%。该系统保证了数据正确性、提高了工作效率，实现了气象纸质表格资料快速形成数字档案的目标，也为数字档案工作提供了新的思路；在新冠疫情导致传统数字化人工聚集工作模式面临较大风险的背景下，具有一定的现实意义。  相似文献   

全新世以来珠江三角洲快速沉积体的初步研究   总被引：1，自引：1，他引：0       下载免费PDF全文

贾良文  何志刚  莫文渊  吴超羽 《海洋学报》2010,32(2):87-95

根据珠江三角洲代表性钻孔资料以及PRD-LTMM长周期"动力-沉积-形态"模型分析了珠江三角洲形成发育过程中的快速沉积现象,提出了珠江三角洲快速沉积体的概念,并且对典型快速沉积体的成因进行了初步分析。快速沉积体有明确的沉积环境和特定的沉积动力成因,沉积速率为每年厘米级,研究它可以深入地揭示珠江三角洲基本沉积单元的形成过程,为探索珠江三角洲的形成、发育机制打下基础。初步发现的快速沉积体有古汇潮点快速沉积体、古涨潮射流快速沉积体和台地周边快速沉积体。研究结果表明,快速沉积体的形成多与特定的地形边界条件下形成的中、小尺度动力结构有关,具有高度的时空变化。掌握珠江三角洲地形边界的特点、变化过程及其作用下的中、小尺度动力结构是研究珠江三角洲快速沉积体的关键。  相似文献   

国家地震速报备份系统定位结果评估   总被引：1，自引：0，他引：1  

沈玉松  康英  黄文辉  刘军 《中国地震》2011,27(2):155-164

国家地震速报备份系统的自动实时处理系统能够在地震发生后几分钟之内自动确定出地震的3要素.分析2009年1月～2010年10月的自动定位结果后发现,282个4级以上地震的自动定位结果与中国地震台网中心(CENC)的人机交互速报结果(CC)匹配;70％的地震震级误差≤0.3;69％的国内及周边地区地震的震源水平位置定位误差≤20km,73％的国外地震的震源水平位置定位误差≤50km;国内及周边地区地震的平均速报时间为3.5min,国外地震平均为11.1min,该系统速报速度明显高于人机交互速报速度.全球6级以上地震中有284个的定位结果与欧洲-地中海地震学中心(EMSC)的实时定位结果匹配,其中49％的地震震级误差≤0.3;73％的地震水平误差不超过50km,68％的地震震源深度误差≤50km,对于震源深度大于300km的深源地震,90％的地震震源深度误差不超过50km.另对未匹配及误差较大的地震事件进行了进一步的分析.  相似文献