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董春明 《地震地磁观测与研究》1989,10(1):70-73
本文介绍一种小型文件管理系统,可用于完成在微型计算机上建立各种不同结构和类型的数据库文件。这个系统可同时对地震数据、地震目录、观测报告、年表、图书文献和人事科技档案等不同的数据库文件进行管理与查询。当微机与其它中高档计算机进行连网后,由于这个系统提供了不同的数据可以互相转换的功能,使各种类型的数据文件达到资源共享。 相似文献
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天津市地震局地震事件共享系统的设计与实现 总被引：3，自引：3，他引：0
分析了天津市测震台网历史数据的使用现状,并利用PHP语言和百度地图API程序的二次开发,建立了天津市地震局地震事件共享系统。利用该系统实现了天津市地震局历史地震事件的共享,用户可通过共享系统查询地震目录和下载地震事件,通过My Sql数据库语言设计系统各功能模块相关数据库表单,保存地震目录信息、用户反馈信息相关图片。该系统通过SESSION变量实现用户权限管理,避免了事件文件误传的可能性。通过该系统平台的投入使用,提升了系统原有地震事件保存方式,方便了用户查询使用事件文件的效率,使数据共享工作在天津市地震局得到了提升。 相似文献
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本系统用于存储和检索地震目录、震相数据及台站信息。它通过一系列键盘命令来实现系统的全部功能。存入文件的地震时空强参数范围由使用者根据需要决定。文件除了存储在磁带上还可以输出保存在纸带上。文件能进行修改和增删。系统可以根据命令输出任意指定时空强范围的地震。 相似文献
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《地震地磁观测与研究》2015,(5)
河北省地震台网信息服务平台,依托Oracle数据库,对原始数据(地震目录、台站信息等)进行标准化、归一化、集成化处理,实现基于图形化展示的地震目录、台站信息数据管理服务系统,为用户提供查询、观测、定制、下载等功能,为地震预报和科研工作提供支持。 相似文献
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简要地介绍了测震数据库管理系统的研制背景、目的,详尽地描述了系统构成、测震数据库结构、系统功能、系统特点和认证技术。本系统采用服务器端的脚本编程语言PHP和MySQL数据库组合开发,具有增加数据库用户及用户授权、修改用户密码、数据库备份、数据表更新、地震查询及文本目录的输出、震相查询及文本格式输出、非天然地震查询、波形数据下载等功能。 相似文献
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引言１９９１年笔者用ＴＲＵＥＢＡＳＩＣ语言编写了新疆地震目录查询程序,经新疆地震局防御自然灾害研究所和预报室的多年应用,效果较好。但由于该程序是用ＢＡＳＩＣ语言直接读取ＤＢＦ数据文件,查询受数据库结构类型和字段长度限制,所以通用性差。本文将新疆地震目录查询系统改用ＦｏｘＰｒｏ２．５语言编写,震中分布图显示程序用ＴＵＲＢＯＢＡＳＩＣ语言编写,解决了这个问题。查询时只受查询字段的定义限制,与字段多少和长短无关,提高了查询速度及程序运行的可靠性和通用性。１ 新疆地震目录查询系统的结构地震目录查询系统的… 相似文献
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采用MS—SQL Server2000数据库对地震台网基础数据和后产出数据(如地震目录、地震观测报告、地震波形数据、地震速报目录及与其对应的标准地震目录、脉冲标定波形、系统标定波形及幅频特性曲线等)进行集成管理并楗供了远程服务功能，使科研、预报人员能够通过网络快速检索到经过统一整理、格式一致的各种数据资料。同时，该系统还提供了台网观测质量在线评比功能。 相似文献
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在开发地震目录查询系统的过程中，通过CSS样式和PHP程序的结合运用。可动态地控制地震目录查询系统的返回结果，使查询结果的显示可以随获取的地震目录的条数而改变。极大地方便查询者。 相似文献
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基于JOPENS数据处理系统,利用C#和MySQL数据库技术,设计软件实现地震速报和地震目录数据服务功能。利用该软件,实现地震速报信息实时监控和采集,建立北京市地震局地震速报数据库,实现北京及首都圈地区最新地震速报数据获取和地图显示,并自动生成地震速报卡;统计强震后发生的余震,自动生成余震报告;综合检索地震目录数据库,实现查询结果的图形化显示。 相似文献
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本文基于波形相似性提出了一种适用于地震序列中单台事件目录校正的方法。以福建仙游地震序列为研究对象,应用双差地震定位（HypoDD）算法对多台事件进行重定位,依据记录波形相似性将仙游地震序列事件划分为161个事件丛集,以多台事件重定位目录为参考,对单台事件目录进行校正。结果表明,本方法能够有效地实现单台事件目录的合理校正,有助于提升地震序列目录的完整性和地震目录的实用性。以HypoDD重定位目录为参考的校正目录可用于地震参数计算。分析校正后的仙游地震序列目录认为,序列中的单台事件主要由金钟水库库区局部应力调整诱发。 相似文献
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UNIFIED EARTHQUAKE CATALOG FOR CHINA’S SEAS AND ADJACENT REGIONS AND ITS COMPLETENESS ANALYSIS 
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下载免费PDF全文 China’s seas and adjacent regions are affected by interactions among the Eurasian plate, the western Pacific plate, and the Philippine Sea plate. Both intraplate and plate-edge earthquakes have occurred in these regions and the seismic activities are frequent. The coastal areas of China are economically developed and densely populated. With the development and utilization of marine energy and resources along with the development of national economy, the types and quantity of construction projects in the marine and coastal areas have increased, once an earthquake happens, it will cause huge damage and loss to these areas, therefore, the earthquake-related research for these sea areas cannot be ignored and the need for study on these areas is increasingly urgent. One type of essential basic data for marine seismic research is a complete, unified earthquake catalog, which is an important database for seismotectonics, seismic zoning, earthquake prediction, earthquake prevention, and disaster reduction. Completeness and reliability analysis of an earthquake catalog is one of the fundamental research topics in seismology.
At present, four editions of earthquake catalogs have been officially published in China, as well as the earthquake catalogue compiled in the national fifth-generation earthquake parameter zoning map, these catalogs are based on historical data, seismic survey investigations, and various instrumental observations. However, these catalogs have earlier data deadlines and contain the earthquake records for only the offshore regions of China, which are extensions of coastal land. Distant sea regions, subduction zones, and adjacent sea regions have not been included in these catalogs. Secondly, there were no cross-border areas involved in the compilation of earthquake catalogs in the past. It was not required to use magnitudes measured by other countries’ seismic networks and observation agencies to develop an earthquake catalog with a uniform magnitude scale, moreover, there was no formula suitable for the conversion of magnitude scale in China’s seas areas and adjacent regions. Little research has been conducted to compile and analyze the completeness of a unified earthquake catalog for China’s seas and adjacent regions. Therefore, in this study, we compiled earthquake data from the seismic networks of China and other countries for China’s seas and adjacent regions. The earthquake-monitoring capabilities of different sea areas at different time periods were evaluated, and the temporal and spatial distribution characteristics of epicentral location accuracy for China’s seas and adjacent regions were analyzed. We used the orthogonal regression method to obtain conversion relationships between the surface wave magnitude, body wave magnitude, and moment magnitude for China’s seas and adjacent regions, and established magnitude conversion formulae between the China Seismic Network and the ML magnitude of the Taiwan Seismic Network and the MS magnitude of the Philippine Seismic Network. Finally, we developed an earthquake catalog with uniform magnitude scales for China’s seas and adjacent regions.
On the basis of the frequency-magnitude distribution obtained from the magnitude-cumulative frequency relationship (N-T) and the Gutenberg-Richter(GR)law, we conducted a completeness analysis of the unified earthquake catalog for China’s seas and adjacent regions, Then, we identified the beginning years of each magnitude interval at different focal depth ranges and different seismic zones in the earthquake catalog.
This study marks the first time that a unified earthquake catalog has been compiled for China’s seas and adjacent regions, based on the characteristics of seismicity in the surrounding sea regions, which fills the gap in the compilation of the earthquake catalogue of China’s seas and adjacent areas. The resulting earthquake catalog provides a basis for seismotectonics, seismicity study, and seismic hazard analysis for China’s seas and adjacent regions. The catalog also provides technical support for the preparation of seismic zoning maps as well as for earthquake prevention and disaster reduction in project planning and engineering construction in the sea regions. In addition, by evaluating the earthquake-monitoring capability of the seismic networks in China’s seas and adjacent regions and analyzing the completeness of the compiled unified earthquake catalog, this study provides a scientific reference to improve the earthquake-monitoring capability and optimizing the distribution of the seismic networks in these regions. 相似文献
At present, four editions of earthquake catalogs have been officially published in China, as well as the earthquake catalogue compiled in the national fifth-generation earthquake parameter zoning map, these catalogs are based on historical data, seismic survey investigations, and various instrumental observations. However, these catalogs have earlier data deadlines and contain the earthquake records for only the offshore regions of China, which are extensions of coastal land. Distant sea regions, subduction zones, and adjacent sea regions have not been included in these catalogs. Secondly, there were no cross-border areas involved in the compilation of earthquake catalogs in the past. It was not required to use magnitudes measured by other countries’ seismic networks and observation agencies to develop an earthquake catalog with a uniform magnitude scale, moreover, there was no formula suitable for the conversion of magnitude scale in China’s seas areas and adjacent regions. Little research has been conducted to compile and analyze the completeness of a unified earthquake catalog for China’s seas and adjacent regions. Therefore, in this study, we compiled earthquake data from the seismic networks of China and other countries for China’s seas and adjacent regions. The earthquake-monitoring capabilities of different sea areas at different time periods were evaluated, and the temporal and spatial distribution characteristics of epicentral location accuracy for China’s seas and adjacent regions were analyzed. We used the orthogonal regression method to obtain conversion relationships between the surface wave magnitude, body wave magnitude, and moment magnitude for China’s seas and adjacent regions, and established magnitude conversion formulae between the China Seismic Network and the ML magnitude of the Taiwan Seismic Network and the MS magnitude of the Philippine Seismic Network. Finally, we developed an earthquake catalog with uniform magnitude scales for China’s seas and adjacent regions.
On the basis of the frequency-magnitude distribution obtained from the magnitude-cumulative frequency relationship (N-T) and the Gutenberg-Richter(GR)law, we conducted a completeness analysis of the unified earthquake catalog for China’s seas and adjacent regions, Then, we identified the beginning years of each magnitude interval at different focal depth ranges and different seismic zones in the earthquake catalog.
This study marks the first time that a unified earthquake catalog has been compiled for China’s seas and adjacent regions, based on the characteristics of seismicity in the surrounding sea regions, which fills the gap in the compilation of the earthquake catalogue of China’s seas and adjacent areas. The resulting earthquake catalog provides a basis for seismotectonics, seismicity study, and seismic hazard analysis for China’s seas and adjacent regions. The catalog also provides technical support for the preparation of seismic zoning maps as well as for earthquake prevention and disaster reduction in project planning and engineering construction in the sea regions. In addition, by evaluating the earthquake-monitoring capability of the seismic networks in China’s seas and adjacent regions and analyzing the completeness of the compiled unified earthquake catalog, this study provides a scientific reference to improve the earthquake-monitoring capability and optimizing the distribution of the seismic networks in these regions. 相似文献
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为了由过去的地震活动性推测将来的地震活动性,引入了地震（震级≥m）的期望年发生率v（≥m）来描述一个地区的地震活动性．根据全球地震目录（1964-1994年）以及南加州（1932-1995年）和华北（1970-1994年）两个区域地震目录资料,以统计样本量作为目录记录时间长短的相对量度,对由不同的统计样本量计算得出的地震实际年发生率v（≥m,T,t）进行了统计分析,得到三点结沦：①在统计样本量n足够大的情况下,地震实际年发生率表现出准平稳时间过程的特征,可近似地看作地震期望年发生率,本文给出了这种近似的误差（离差系数）与统计样本量之间的定量关系;②离差系数与统计样本量之间的关系与震级无关,表现出不同震级层次的相似性;③统计样本量相同时,不同震级的地震期望年发生率之间满足logv（≥）=a－bm的关系,形式上与G－R关系相似,但它给出了由小地震的统计特征估计大地震的期望年发生率及其统计误差的方法．基于上述结论,进一步讨论了地震活动性的统计特征在地震危险性分析中的潜在应用。 相似文献
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全国自动地震速报系统综合评估 总被引：1，自引：0，他引：1
通过对2011年1月1日至12月31日的3套独立自动地震定位系统结果进行综合处理,得出中国自动地震综合目录,并与正式速报结果进行对比,得出全国自动地震速报系统综合评估结果,发现该目录对于国内绝大部分5级以上、国外7级以上地震实现整体覆盖,且没有误报发生,可以作为国家台网中心正式地震速报的重要参考,对于建立“自动报～正式报”的两级地震速报制度可提供技术支撑。 相似文献
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2014年 8月3日在云南省鲁甸县发生MS6.5地震,造成了巨大的人员伤亡和财产损失.关于鲁甸地震的起因,特别是鲁甸地震与溪洛渡水库之间的关系存在一些争议.分析中强地震前后地震活动性的变化可以为判断主震起源提供一定的依据.然而,由于鲁甸地震震中附近固定台站数目少、台站距离震中远及主震后尾波干扰等因素的影响,会造成地震目录的缺失,从而可能影响地震活动性的可靠分析.为了获得更加完备的地震目录,本文采用模板匹配方法对鲁甸地震前后小地震进行了搜索和识别.以台网目录中的541个事件作为模板,在主震之前33天到主震后5天的连续波形中识别出991个未在目录中列出的地震,使余震的完备震级从1.8降低到1.3.根据检测目录得到主震前33天内的b值为1.04±0.18,余震的b值在震后5天内由0.5左右逐渐上升至0.9附近并保持稳定;根据2009年到主震发生前的台网目录得到该区域的背景b值为0.93±0.04.即鲁甸地震前后区域地震活动b值均与背景b值接近,这与典型水库诱发的中强震具有的b值特征不相符.同时通过进一步分析台网目录,未发现溪洛渡水库蓄水前后研究区域内的地震活动性存在明显变化,这也与典型水库诱发地震区域的地震活动性特征不相符.综合以上结果,我们认为2014年鲁甸MS6.5地震不具有典型水库诱发地震的特征. 相似文献
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The analysis of seismic hazards relies on the statistical analysis of historical seismic data and the instrumental seismic catalog to obtain the regional earthquake recurrence interval and earthquake probability. The accuracy of analysis thus depends strongly on the completeness of the seismic data used. However, available seismic catalogs are too short or incomplete for the reliable analysis of the statistical characteristics of earthquakes. If a long-term synthetic seismic catalog can be generated using a physics-based numerical simulation, and the simulation results match the crustal deformation, seismicity, and other observations,then such a synthetic catalog helps us to further understand the characteristics of seismic activity and analyze the regional seismic hazard. In this paper, taking the northeastern Tibetan Plateau as a case study, we establish a three-dimensional visco-elastoplastic finite-element model to simulate earthquake cycles and the spatiotemporal evolution of earthquakes on the model fault system and obtain a seismic catalog on a time scale of tens of thousands of years. On the basis that the model satisfies the regional geodynamics of the northeastern Tibetan Plateau, we analyze seismicity on the northeastern Tibetan Plateau using the simulated synthetic earthquake catalog. The characteristics of earthquake recurrence at different locations and different magnitudes, and the long-term average probability of earthquake occurrence within the fault system on the northeastern Tibetan plateau are studied. The results are a reference for regional seismic hazard assessment and provide a basis for the physics-based numerical prediction of earthquakes. 相似文献
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人工地震目录模拟是改进现有地震目录不完备性、弥补大地震记录稀缺,以及完善地震学相关研究的有效途径之一。本文基于地震活动的泊松分布模型、古登堡-里克特震级-频度关系,利用能较逼真描述具有随机性质事物特点及物理实验过程的蒙特卡洛方法,模拟汾渭地震带未来30、50、100年等不同时长的地震目录,并对其进行统计检验。分析表明,模拟地震目录符合设定的地震活动性参数和泊松分布假设特征。依据模拟地震目录,对未来该区域地震趋势进行了分析,以期为地震危险性分析提供参考。 相似文献