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(新疆维吾尔自治区地震局喀什地震台,新疆喀什844000)中国地震局“九五”数字地震台网建设之前,我国的地震观测主要是用模拟地震仪进行的。模拟记录资料为地震学家开展地震定位、地球内部结构、震源机制等方面的研究提供了基础,推动了近代地震学的发展。地振动的频带很宽,从周期104s的固体潮到10-1—10-2s的微震和极微震,周期跨越了6个数量级。模拟记录地震仪的频带较窄,动态范围不大,即使配备上短周期、中长周期、长周期等不同频段的地震仪,其记录频带范围仍具有一定的局限性。“九五”期间,中国地震局“95-01-01”项目对地震观测仪器进行… 相似文献
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地磁相对记录的任务是连续记录因电离层中的电流体系引起的地磁场变化。本文详细阐述了应用于地磁相对记录的数字矢量磁力仪的工作原理、信号处理电路设计以及发展趋势。 相似文献
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潮汐数字记录应用软件 总被引：1，自引：0，他引：1
文中较详细地介绍了重力潮汐数字记录系统应用软件,主要包括数字采集的控制部分、观测资料的日常处理、重力仪记录格值的标定等一系列与台站观测有关的处理功能。它实现了潮汐信息从采集到成果处理的自动化,首次将48小时的Nakai潮汐数据预处理方法引入PC-1500计算机。它能有效地剔除、修正数字采集器本身无法识别的错误数据或干扰信号,使观测人员能根据拟合参量的变化,及时了解仪器的工作状况及记录系统灵敏度的变化。实践表明:此软件配合数字采集系统使用后大大提高了重力固体潮观测的整体水平。对这一软件作部分的改进后,可用于固体潮其它分量的观测。 相似文献
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牟其铎教授是国家地震局地球物理研究所研究员、中国数字地震台网技术管理研究室主任。本文包括：作一个线性系统的地震观测系统、数字地震记录的压缩、数字地震记录的格式三部分。 相似文献
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利用广州地震台测震数字记录资料与模拟记录资料，对数字记录的震相到时、震级、地震波形清晰度、连续率与模拟记录进行对比分析，结果显示，数字记录与模拟记录的震相到时、震级差别不大，而地震波形清晰度、连续率则数字记录优于模拟记录。 相似文献
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金寨地震台数字地震仪的监测能力分析 总被引：1，自引：0，他引：1
《高原地震》2015,(3)
利用目前各类仿真记录的震级计算公式及近年金寨地震台台基的地动噪声有效值,结合各区域震相识别经验等设定了可检测地震的首至P波震相振幅、S波和面波的最大振幅与台基地动噪声有效值的比值,并分别计算和分析了金寨台宽频带数字地震仪仿短周期(DD-1仪)记录的近震监测能力、仿中长周期记录的远震监测能力及仿长周期(763仪)记录的远震和极远震监测能力。 相似文献
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宽频带数字地震记录仿真的应用 总被引：10，自引：5，他引：10
利用傅里叶分析法，把速度型宽频带数字地震记录变成台站人员所熟悉的长周期，中长周期模拟常规地震记录，分析人员能在仿真后的记录波形图上识别震相和计算震级。为地震台站用宽频带数字地震记录取代模拟记录提供了一种资料处理方法。 相似文献
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日益丰富和完善的地震数据在过去几十年里促进了地震学的长足发展。我们收集、处理和分析地震数据的能力借助于电子和数字计算机的发展得到迅速提高。几十年前地震图主要是模拟记录。现在除了一些基本的用途外，模拟记录由于其动态范围低、记录系统的时间精度差以及数据处理不方便等因素而很少使用了。 相似文献
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Study on the Moment Magnitude of Small and Moderate Earthquakes Located in the Inner Mongolia Region
Based on digital seismic waveform data from Inner Mongolia Digital Seismic Network, the source spectrum parameters of 182 small and moderate earthquakes from January, 2009 to September, 2016 are derived, and the seismic moment M0 and moment magnitude MW of the earthquakes are calculated. The ML-MW relationship and the relationship between stress drop and magnitude are obtained using the linear regression method. It is clear that incorporating the moment magnitude into the seismic quick report catalog and the official earthquake catalog can enrich earthquake observation report content, thus providing better service for earthquake emergency and earthquake scientific research. 相似文献
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2006年2月,位于浙江文成与泰顺交界的珊溪水库发生了最大震级为ML4.6的震群.我们分别利用浙江省区域数字地震台网和珊溪水库现场数字监测网的观测数据,运用不同的定位方法,对震群进行了定位.通过比较分析,讨论了不同的定位方法与不同观测数据的定位效果. 相似文献
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为了提高乌兰浩特地震台、阿尔山火山地震观测站的震级精度,基于面波震级公式和残差统计方法,分别计算乌兰浩特台、阿尔山火山地震观测站与中国地震台网中心测定的面波震级之间的偏差,分析产生震级偏差的影响因素。结果表明：乌兰浩特台、阿尔山火山地震观测站测定的面波震级与中国地震台网发布震级的偏差平均值分别为0.19、0.17;震级偏差总体呈现随震级的增加而先增大后减少的趋势;阿尔山火山地震观测站震级偏差随震中距的增大而增大,而乌兰浩特台则先增大后减少。 相似文献
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为了提高乌兰浩特地震台、阿尔山火山地震观测站的震级精度,基于面波震级公式和残差统计方法,分别计算乌兰浩特台、阿尔山火山地震观测站与中国地震台网中心测定的面波震级之间的偏差,分析产生震级偏差的影响因素.结果表明:乌兰浩特台、阿尔山火山地震观测站测定的面波震级与中国地震台网发布震级的偏差平均值分别为0.19、0.17;震级偏差总体呈现随震级的增加而先增大后减少的趋势;阿尔山火山地震观测站震级偏差随震中距的增大而增大,而乌兰浩特台则先增大后减少. 相似文献
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论述了适用于遥测地震台网大震速报的一套计算机处理系统,系统设计以《全国遥测台网观测技术规范》和《近震分析》理论为依据,实现了数据输入,震相选择,数据处理,地震定位,震级计算,结果输出及贮存等多项功能,达到了快速确定地震三要素,提高速报速度和精度之目的,是一个较完善的,实用的速报系统。 相似文献
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汶川5.12大地震发生后,在武都汉王地震台及其附近地区布置了2个大地电磁测深点,进行了两期余震序列的地震电磁效应连续监测,共观测到Ms4.0及以上的余震事件35次.通过与汉王强震台的地震记录数据中15个强震记录比较发现,与地震波相对应的地震同震电磁信号存在于所有的电场和磁场记录分量中,它们与地震波到达同步.地震破裂发生时的电磁辐射信号在记录数据中相比地震波达到观测点的电磁信号幅度要小得多,无法从观测数据识别出来.通过分析对比地震位移和同震电磁信号的关系,提出了地震电磁同震信号产生的地震波驱动机理,认为观测系统在地球基本磁场中随地面运动产生了地震同震电磁信号,并从观测的地震振动位移和电磁信号进行了验证. 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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以2014年11月22日四川康定发生6.3级地震后开展应急流动观测为例,描述了在应急流动观测组网中,如何应对震区高原环境,完成4个流动台选址架台、快速组网、运维保障;并通过对流动台址地动噪声功率谱密度分析计算,获得的台基达Ⅱ或Ⅲ级环境地动噪声水平,余震微小震检测能力与定位精度得到极大改善。流动台网运行期间,提高了震区监测台站覆盖面,记录到了大量余震微小震,加密台站对震区定位精度提升了量级,震源深度、震级更加准确。结果表明:一旦大震发生后,及时组织开展应急流动观测是必要的,而完成好一次大震后快速有效的应急流动监测,必须综合考虑震区地域环境、人员配备、预案选择、通信条件、设备可靠诸多因素与运维保障,采用固定与流动台联合组网方式,应急流动发挥效益最佳。 相似文献