乌鲁木齐遥测地震台网和新疆地震台网的地震定位与分析

利用新疆地震台网和乌鲁木齐遥测地震台网在乌鲁木齐地区１００ｋｍ范围内１９９３年６月至１９９３年１２月１０日各自定位的地震资料，以新疆地震台网为参考基准，将乌鲁木齐遥测地震台网的资料与其进行了对比。对比发现遥测地震台网比新疆地震台网在地震数量上多３２．９％，在定位精度上也相对要高一些。另外，根据地震定位的三种交切结果，分析了遥测台网地震定位现状。     

1997-1998年伽师强震群震源区应力场特征

利用1997-1998年伽师强震群中强地震震源机制系统聚类及震源区应力场反演,得到以下主要结果:(1)伽师强震群中强地震主要以走滑和正断层为主,伽师震源区主压应力方向为NNE或近NS向,与相邻的柯坪块体区域构造应力场方向不一致;伽师强震群的破裂面沿NEE方向,属左旋破裂;(2)4~5级中强地震应力场反演得到最大主压应力轴为NNE向,最小主压应力轴为NWW向,中等主应力轴倾角为65°,比较直立;(3)伽师强震群震源区应力场在强震前后经历了一系列变化。最后对所得结果进行了一定的讨论。     

天津遥测地震台网井下地震波地动位移与地动速度记录的对比分析

本文对比和分析了天津遥测地震台网井下地震波地动位移和地动速度记录的特点,结果表明:(1)台网增加速度记录有利于地震参数的测定,是位移记录的必要补充;(2)有利于监测本区微震活动;(3)是提高平原地区遥测地震台网控震能力的一种有效途径。     

大同遥测地震台网小震群活动与大同-阳高中强地震预报讨论

根据大同遥测地震台网记录到的小震群资料，用组合模式理论［１］对本区的小震群时空演化规律进行了分析研究。结果表明，对于１９８９年１０月１８日在本区发生的大同—阳高５．８级地震，利用震前小震群资料得出的预报震中与实际震中有较好的一致性。另外，通过震群与外因相关性的分析，对发震时间的预报也取得了较好的效果     

西藏芒康震群发震构造分析

2018年12月13日23时32分、39分,在西藏昌都市芒康县连续发生M4.9和M4.4地震;随后12月14日1时15分、38分、42分,该地又连续发生了3次M≥30地震,地震震中位于川滇菱形块体西北部金沙江断裂带、巴塘断裂带和藏东澜沧江断裂带所夹持的区域。基于四川及周边区域地震台网的观测资料,采用双差定位方法,对芒康震群序列进行了重新定位,并利用CAP波形反演方法,获得了5个M≥30地震的震源机制解、震源矩心深度与矩震级。根据震群序列空间展布、较大地震震源机制解和震源区附近的地质构造,初步分析认为:芒康震群序列地震展布在地表下长约16 km、宽约6 km,深度在5～20 km的区域;与震群序列空间展布方向较为一致的节面I为发震断层面,断面倾向NE,倾角约为65°,滑动角约为-34°;震源区主压应力P轴方位为近EW向,与该区域构造应力场主压应力方向一致,推测本次震群地震应是在羌塘块体物质持续E向挤入作用下,位于羌塘地块东南缘的一条NWW向次级隐伏断裂拉张运动引起的。     

三峡数字台网地震目录与地震报告的编辑

长江三峡数字遥测地震台网地需求目录与地震报告的编辑，是当每天地震交切定位后，存放到总库中，月底编辑、修改、整理形成地震目录和地震报告。本文主要对三峡数字遥测地震台网地震目录与地震报告的编辑进行阐述。     

山西遥测地震台网的技术管理

本文以山西3个地方性遥测地震台网为例,对如何加强遥测地震台网的业务技术管理和提高台网的产出质量等问题作了研究初探讨。为遥测地震台网在地震监测中更好地发挥其效益提供了参考。     

Geotech宽频带数字地震观测系统原理及应用

引言为推动我国防震减灾事业的持续发展,“九五”期间在中央和地方各级人民政府的大力支持下,中国地震局实施了“中国数字地震观测系统建设”项目,其中有对区域模拟遥测地震台网进行全面的数字化技术改造和建设。这些数字遥测地震台网观测系统大都采用由国内生产的JCV系列或FSS3型短周期地震计(频带1s～20Hz)和部分FBS3型宽带地震计(频带20s～20Hz)以及16位EDAS3型数据采集器,台网中心采用的是国内EDSPMCRTS实时地震数据处理系统(中国地震局监测预报司,2003)。数字遥测地震台网的运行,很大程度上改善了这些地区的地震监测能力,提…     

运城震群序列及其震相特征——华北地区遥测地震台网联网论文续四

利用临汾无线遥测地震台网的记录资料,探讨了运城震群活动的序列特征,对震群活动的震相记录特征进行了较全面的总结和分析.     

运城震群序列及其震相特生：华北地区遥测地震台网联网论文续四

利用临汾无线遥测地震台网的记录资料，探讨了运城震群活动的序列特征，对震群活动的震相记录特征进行了较全面的总结和分析。     

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     

Solute concentrations in the lower niger river and the source rock contribution

Water quality analyses for the Niger River for the 1980/81 hydrological year are presented. The samples were collected from the main river at Lokoja, and from two main tributaries, the Kaduna and the Benue Rivers. Different water types were distinguished by the concentrations of major ions. The type Ca > Na > Mg > K - HCO₃ > SO₄ > Cl was represented at all stations during at least part of the year. Chloride was found to dominate the sulphate ion in the Kaduna and Niger, while the Benue maintained a higher concentration of sulphate relative to chloride all year round. Distinct patterns of seasonal variation in the ion concentrations were observed, particularly for the samples collected at Lokoja. Low ion concentrations were prominent during periods of high discharge, while low flow periods coincided with high dissolved ion concentrations. The contribution of rainwater to the total dissolved solids in the river waters was assessed indirectly using rainwater chemistry data from the Gulf of Guinea. The estimated rainwater contribution to the Lower Niger amounts to 5.15 mg 1^?1. Geochemical weathering calculations involving reactions of the four major minerals of granitic rocks - anorthite, biotite, albite, and K-feldspar - with carbon dioxide and water, can account for the average water composition of the Lower Niger. The proportion of the ionic components was also related to the occurrence of the respective element in the minerals.