传统地震目录中增加矩震级及震源机制解的必要性分析   总被引：1，自引：0，他引：1  

康英  杨选  沈玉松 《中国地震》2015,31(1):121-132

本文梳理了我国地震目录的产出现状,对于我国近几年应急机构和区域台网产出的震源机制解、矩震级进行了比较研究。结果表明:中国地震局地球物理研究所和地震预测研究所对于国内陆地地区6级以上地震的地震矩张量解的产出率为100%,5级以上地震的地震矩张量解产出率为81%。这两个研究所给出的3种矩张量结果和GCMT给出的矩张量结果较为一致,类型统计一致率分别达到71%、86%和66%,其中P、T轴空间夹角优势分布在15°左右。产出的矩震级和GCMT解得到的矩震级相差不大,偏差在0.1以内的比率分别为46%、86%和71%,偏差在0.3以内的比率分别为85%、100%和97%。结果表明对于我国内陆地区的5级以上地震,这两个研究所产出率较高、结果较为一致。而由各台网据震源参数得出的5级左右地震的矩震级和GCMT求解的矩震级比较起来明显偏小。由此探讨了在传统地震目录中增加震源机制解及矩震级的必要性。  相似文献   

基于Django框架的可视化地震目录服务系统1     

马士振  白立新  张海春  郭士军  林向东  白永福 《震灾防御技术》2015,10(3):695-699

为提高测震台网地震目录数据的服务水平,构建了基于Django框架的可视化地震目录服务系统。该系统以Django框架为基础,在前端工具包Bootstrap的管理下,通过Highcharts图形库和高德地图实现了地震目录的可视化服务,为地震目录的对外服务提供了一种较为高效便捷的途径。  相似文献   

基于WebGIS的地震目录数据发布系统研究     

侯建民  刘瑞丰  赵京轶  任枭  陈宏峰  徐志国  刘电清 《地震地磁观测与研究》2008,29(2):106-111

介绍了ArcIMS的体系结构、特点及技术优势。构建了基于ArcIMS的地震目录等信息的发布系统,提出了系统设计的思想、功能、特点及实现的方法,并通过实例操作演示了基于WebGIS的地震目录数据发布系统。  相似文献   

A catalog of X-ray sources as observed by the TTM/COMIS telescope onboard the Mir-Kvant observatory in 1988–1998     

A. N. Emelyanov  N. L. Aleksandrovich  R. A. Sunyaev 《Astronomy Letters》2000,26(5):297-308

A catalog of X-ray sources as observed by the TTM/COMIS telescope onboard the Mir-Kvant observatory is presented. Brief information about the 67 sources detected at a confidence level higher than 4σ between 1988 and 1998 is provided. X-ray properties and characteristic spectra of different types of sources are briefly described.  相似文献   

陕甘宁交界地区地震目录最小完整性震级分析   总被引：1，自引：1，他引：0  

冯亮亮  石军 《地震地磁观测与研究》2018,39(4):18-24

根据陕甘宁交界区域测震台网中心提供的地震目录及部分台网资料,利用基于G-R关系的EMR方法,对1970年以来该区域地震目录最小完整性震级M_c的时空分布进行分析。结果显示：自1970年以来,该区域最小完整性震级M_c逐步下降,模拟、"九五""十五"阶段M_c分别为M_L 2.3、M_L 2.2、M_L 1.6,2015年以来M_c维持在M_L 1.3左右;"十五"数字化改造后,M_c空间分布呈现不均匀性,但整体低于M_L 1.8。  相似文献   

Tycho-2星表读取及恒星视位置计算研究     

郭金运  代杰  姜爱辉  于学敏  韩延本 《测绘科学》2015,(9)

为了建立高精度的恒星视位置计算模型,该文基于FORTRAN语言对Tycho-2星表进行读取,并分别绘制J2000.0时刻全球和中国区域恒星分布图;建立了一个新的恒星视位置计算模型,对天顶望远镜实测CCD星像进行处理,并与NOVAS-F程序的视位置计算结果进行比较,以此验证新的计算模型的可行性。实验结果表明,新的恒星视位置计算模型精度符合精密天文大地测量标准。  相似文献   

福建历史地震与地震灾害特征史料分析   总被引：1，自引：0，他引：1  

傅再扬  黄宏生  危福泉  林岩钊 《地震地磁观测与研究》2011,32(5):172-179

以中国地震学会历史地震专业委员会2005年复核审定的“福建省历史强震简目”为基础,将收集到的强震参数与“福建省志·地震志”的记载进行比较分析,找出差异,建立统计对比表,突出历史大地震的参数、地震影响和地震灾害特征,并就历史地震资料的修订和使用提出看法,充分认识和反映该地理区域真实的历史地震活动和震害影响,为福建地区历史...  相似文献   

菲律宾—印度尼西亚东部地震S波走时异常初探     

王九洋  吴小平  焦明若  李广平 《地震地磁观测与研究》2013,(5):46-51

大连地震台在实测中,经常观测到来自菲律宾-印度尼西亚东部一带的地震S波较理论到时提前约数秒到达.2002年至2011年,记录到该地区145例具有此种显著异常的震例.该现象与台基无关,全国地区均可观测到.震例分析发现,可观测到该现象与未观测到明显异常的台站在全球范围内大致呈四象限分布,造成该异常现象的原因可能与震源过程有关.  相似文献   

Catalog of Enhanced Geothermal Systems based on Heat Sources     

KONG Yanlong  PAN Sheng  REN Yaqian  ZHANG Weizun  WANG Ke  JIANG Guangzheng  CHENG Yuanzhi  SUN Wenjie  ZHANG Chao  HU Shengbiao  HE Lijuan 《《地质学报》英文版》2021,95(6):1882-1891

It is common sense that a deeper well implies higher temperature in the exploration of deep geothermal resources, especially with hot dry rock (HDR) geothermal resources, which are generally exploited in terms of enhanced geothermal systems (EGS). However, temperature is always different even at the same depth in the upper crust due to different heat sources. This paper summarizes the heat sources and classifies them into two types and five sub-types: crust-origin (partial melting, non-magma-generated tectonic events and radiogenic heat production), and mantle-origin (magma and heat conducted from the mantle). A review of global EGS sites is presented related to the five sub-types of heat sources. According to our new catalog, 71% of EGS sites host mantle-origin heat sources. The temperature logging curves indicate that EGS sites which host mantle-origin magma heat sources have the highest temperature. Therefore, high heat flow (>100 mW/m2) regions with mantle-origin magma heat sources should be highlighted for the future exploration of EGS. The principle to identify the heat source is elucidated by applying geophysical and geochemical methods including noble gas isotope geochemistry and lithospheric thermal structure analysis. This analytical work will be helpful for the future exploration and assessment of HDR geothermal resources.  相似文献   

A high-resolution seismic catalog for the 2021 MS6.4/MW6.1 Yangbi earthquake sequence,Yunnan, China: Application of AI picker and matched filter          下载免费PDF全文

Yijian Zhou  Abhijit Ghosh  Lihua Fang  Han Yue  Shiyong Zhou  Youjin Su 《地震科学（英文版）》2021,34(5):390-398

We present a high-resolution seismic catalog for the 2021 M_S6.4/M_W6.1 Yangbi sequence. The catalog has a time range of 2021-05-01 to 2021-05-28, and contains ~8,000 well located events. It captures the features of the whole foreshock sequence and the early aftershocks. We designed a detection strategy incorporating both an artificial intelligent (AI) picker and a matched filter algorithm. Here, we adopt a hybrid AI method incorporating convolutional and recurrent neural network (CNN & RNN) for event detection and phase picking respectively (i.e. CERP), a light-weight AI picker that can be trained with small volume of data. CERP is first trained with detections from a STA/LTA and Kurtosis-based method called PAL, and then construct a rather complete template set of ~4,000 events. Finally, the matched filter algorithm MESS augments the initial detections and measures differential travel times with cross-correlation, which finally results in precise relocation. This process gives 9,026 detections, among which 7,943 events can be well relocated. The catalog shows as expected power-law distribution of frequency magnitude and reveals detailed pattern of seismicity evolution. The main features are: (1) the foreshock sequence images simple fault geometry with consistent strike, but also show a variable event depth along strike; (2) the mainshock ruptures the same fault of the foreshock sequence and activate conjugate faults further to the southeast; (3) complex seismicity are developed in the post-seismic period, indicating complex triggering mechanisms. Thus, our catalog provides a reliable basis for further investigations, such as b-value studies, rupture process, and triggering relations.  相似文献