"洞察"号能够完成火星内部结构探测的使命吗?

本文聚焦于"洞察"号(InSight)的SEIS项目,介绍它的主要科研目标,以及已有的初步探测与解释成果.作者试图就"洞察"号能在什么程度上实现对火星内部结构探测的科研目标作出评论.评论从三个方面展开:即它能够基本回答的问题,部分回答的问题,及基本上不可能回答的问题.基于到目前为止的观测事实,可以说SEIS的数据分析结...     

美刊文章:《板块内的构造应力》的“摘要”

《地球物理和空间物理评论》杂志1979年8月第17卷5期刊载理查森(Randall M.Richardson)等人的题为《板块内的构造应力》一文,将其“摘要”部分译载如下:岩石圈内的应力状态对作用于板块的力有强烈的制约性。板内地震机制、原地应力测量结果以及对应力敏感的地质特征所表明的板块内的主应力方向可用于验证板块构     

“洞察”号能够完成火星内部结构探测的使命吗?

本文聚焦于“洞察”号(InSight)的SEIS项目,介绍它的主要科研目标,以及已有的初步探测与解释成果.作者试图就“洞察”号能在什么程度上实现对火星内部结构探测的科研目标作出评论.评论从三个方面展开:即它能够基本回答的问题,部分回答的问题,及基本上不可能回答的问题.基于到目前为止的观测事实,可以说SEIS的数据分析结果对“洞察”号着陆点附近的浅地表结构会有精细的描述;对火星壳层的局部结构会有相当的了解.有可能会对火星上部幔层结构提供一些比以前更为严密的约束.但是,到目前为止SEIS数据对人类加深对于火星核结构了解的贡献应该是相对有限的.主要原因是缺乏能量足够大的震源来产生传播于整个火星的波动场.     

对《基于离散余弦变换的磁位谱分析及磁异常导数计算方法》一文的评论

被评论的论文(简称原文)中应用离散余弦变换(DCT法)计算磁异常导数,并与离散Fourier变换法(DFT法)计算结果进行对比,得到“DCT法明显优于DFT法”的结论.我们对原文进行了验证.原文磁异常导数波数响应计算的错误导致DFT法计算的错误,最终导致结论的错误.原文相关两篇论文中应用DCT法分别进行重力异常的导数换算和重力异常的向上延拓,也存在同样的错误.     

对在地震孕育区深化地震电磁综合观测方法的启示:SUPRE计划研究成果

本文介绍近来由俄国、希腊、意大利、乌克兰以及格鲁吉亚执行的欧洲合作项目SUPRE（Study of the ULF electromagnetic Phenomena Related to Earthquakes与地震相关的超低频电磁现象研究）的研究成果,讨论地震孕育区的地震一电磁监测方法的进展和地震灾害评估。主要内容是：在特定地震活动区正在使用的观测技术、提取地震前兆信号的数据处理方法以及地震孕育过程的模型。在此基础之上,对最新提出的、作为下一步地震一电磁合作研究设想的SHARP（Study of Seismic Hazard Anomalies Recognition Possibilities,地震灾害异常识别的可行性研究）计划的战略进行了评论。文中对它的预研结果进行了介绍。     

《中国地震预报概论》

由梅世蓉、冯德益、张国民、朱岳清、高旭、张肇诚六位地震专家撰写的《中国地震预报概论》于今年6月由地震出版社出版发行.它是我国第一部全面系统论述地震预报理论基础及预测预报方法的专著,也是我国20多年来地震预测预报工作的科学总结.全书共分五篇,三十六章,约80万字,275幅图.第一篇 绪论,论述我国地震活动概况和地震预报研究概况.以邢台、海城、唐山、松潘大地震及80年代地震监测预报工作的进展为线索,介绍了中国地震预报的思路、途径、特色的形成历史与工作体制.     

美国帕克菲尔德地区将发生6级地震

1985年,美国《地质评论》发表其所谓的“第一则官方所接受的将在美国国内发生的地震预报”.预报称,1993年前,帕克菲尔德地区蒙特雷城附近的圣安德烈斯断层沿线将发生里氏6级大地震.《地质评论》说,该地区过去每隔22年发生一次震级相似的地震.下次地震震级可能更高,也许会达到7级.     

三峡工程影响的初步评价

全世界都在评论三峡工程的修建,这些评论经常是不太客观的.本文从正负两方面对三峡工程进行了讨论,重点在防洪工程和区域经济方面.作者认为修建三峡工程作为发电的功能远大于防洪的功能.尽管上游来的洪峰经过三峡水库调蓄后能够被削弱.但中游的洪水风险仍然很大.一般而言,中游地区的洪水是大降水事件的产物.三峡工程不可能完全控制中游的洪水.三峡水库发电对中国中部及周边地区经济的可持续发展将产生积极作用,也将能确保东部沿海地区尤其是上海市电能的供给.     

基于新浪微博大数据的新疆伽师6.4级地震舆情分析及可视化研究

基于新浪微博大数据,运用网络爬虫技术,获取新疆伽师6.4级地震后48小时新浪微博相关的博文和评论;通过对数据的去噪、去重、分词、索引等处理,得到结构化的分级、分类数据;在此基础上,产出震后微博舆情声量走势图、震后微博舆情情感值极性分布图、震后微博舆情热词词频统计表、博文和评论词云图以及博文和评论内容分类统计图,实现微博舆情数据的可视化。     

《地球物理学报》中文版投稿须知

本刊注重学术质量 ,同时 ,要求物理量和单位符合国家标准 ;在论文信息量、文章体例等方面均要符合国际惯例 ,具体要求如下 .1题目　用最简洁、恰当的词反映文章的特定内容 .题目中应包括文章的主要关键词 ,一般不超过 2 0个字 ,外文不超过 10个实词 .2摘要　以提供文献内容梗概为目的 ,不加评论和补充解释 ,应具有独立性和自明性 ,并拥有与文献同等量的主要信息 .具四要素 :目的、方法 (原理 )、结果、结论 .中文不超过 4 0 0字 ,英文约 2 5 0个实词 .3关键词　 3— 8个 .4引言　回答“为什么研究”这个问题 ,主要介绍论文背景、研究历史与…     

从单摆到混沌,从孤波到湍流

我们从单摆运动规律入手论述非线性动力学.有关非线性动力学的一些概念如混沌、吸引子、分形、Lyapunov 指数和自组织临界性等都作了讨论,并且评论了混沌和同宿轨道,同宿轨道和孤波,孤波和湍流.湍流和自组织临界性之间的关系.这些为进一步研究非线性动力学提供了线索.     

《地球物理学报》中文版投稿须知

本刊注重学术质量 ,同时 ,要求物理量和单位符合国家标准 ;在论文信息量、文章体例等方面均要符合国际惯例 ,具体要求如下 :1题目　用最简洁、恰当的词反映文章的特定内容 .题目中应包括文章的主要关键词 ,一般不超过2 0个字 ,外文不超过 1 0个实词 .2摘要　以提供文献内容梗概为目的 ,不加评论和补充解释 ,应具有独立性和自明性 ,并拥有与文章同等量的主要信息 .摘要应具四要素 :目的、方法 (原理 )、结果、结论 .中文不超过 40 0字 ,英文约 2 50个实词 .3关键词　 3— 8个 .4引言　回答“为什么研究”这个问题 ,主要介绍论文背景、研究历…     

Contributors to this issue

HUANGFU Gang （皇甫岗） Professor of Earthquake Administration of Yunnan Province. Ph D student of School of Earth and Space Sciences, University of Science and Technology of China. Obtained his MS Degree from Institute of Geology, China Earthquake Administration in 1988. Mainly engaged in researches on seismology, seismogeology and rock mechanics. Member of Committee of Science and Technology, China Earthquake Administration.     

Steadiness and stop of brittle fracture driven by the forces in different distances

Introduction The problem of crack stop of fault is of special importance in geosciences. This is because the risk of rupture of large scale fault is taken as the object of investigation in the geosciences. In some meaning, the stop of earthquake rupture is more important than initial because of its influ-ence on the prediction of energy releasing during the earthquake. There are quite a few of factors that cause stop of the fault. For example, the effect of barriers, the rapid healing of shea…     

Contributors to this issue

ZENG Rong-sheng （曾融生） Professor of Institute of Geophysics, China Earthquake Administration （CEA）, Academician of Chinese Academy of Sciences. Graduated from Department of mathematics, Amoy University in 1946. Mainly engaged in researches on solid geophysics and earth dynamics. Members of Chinese Geophysical Society and member of Seismological Society of China.     

Contributors to this issue

SUN Shao-an （孙少安） Senior Engineer of Institute of Seismology, China Earthquake Administration （CEA）. Graduated from Department of Earth and Space Sciences, University of Science and Technology of China, in geophysics in 1988. Mainly engaged in monitoring and prediction of Earth gravity field and earthquake. Member of Seismological Society of Hubei Province.     

Contributors to this issue

ZENG Rong-sheng (曾融生) Professor of Institute of Geophysics, China Earthquake Administration (CEA), Academician of Chinese Academy of Sciences. Graduated from Department of mathematics, Amoy University in 1946. Mainly engaged in researches on solid geophysics and earth dynamics. Members of Chinese Geophysical Society and member of Seismological Society of China.     

Contributors to this issue

SUN Xun-ying (孙荀英) Professor of Geophysical Department of Peking University. Graduated from Department of Mathematics & Mechanics, Peking University in 1958. She has been engaged in the teaching and research on geodynamics. Her research focus on the mathematical simulation of earthquake sequence and its migration, convection of mantle as well as plate motion by using 2-D, 3-D, 4-D and non-linear methods. Director of Mechanical Society of China. Member of Geophysical Society of Ch…     

Studies on seismic source

During the period of 1999-2002, the Chinese seismologists made a serious of developments in the study on seis-mic sources including observations, experiments and theory. In the field of observation, the methods of the accu-racy location of earthquake sources, the inversion of seismic moment tensor and the mechanism of earthquake source are improved and developed. A lot of important earthquake events are studied by using these methods. The rupture processes of these events are inverted and investigated combined with the local stress fields and the tec-tonic moment by using the measurements of surface deformation. In the fields of experiments and theory, many developments are obtained in cause of seismic formation, condition of stress and tectonics, dynamics of earthquake rupture, rock fracture and nucleation of strong earthquakes.     

REE geochemistry of core sediments of Cauvery delta,India for provenance studies

The rare earth element(REE) geochemical composition of sediments from two cores were used to investigate the provenances of the Late Pleistocene to Holocene sediments of Cauvery delta, South India. The chondrite-normalized REE patterns and bi-variant plots of Th/Co vs. La/Sc and La/Th vs. Th/Yb indicated felsic source of sediments. Chondrite-normalized plots of REE in both cores are almost parallel and exhibit similar fractionation ratio(Ce/Yb)_N of ～8.2. Furthermore, persistence in REEs patterns implies either uniform source rocks and/or efficient homogenization of sediments during transportation and deposition. Chondrite-normalized patterns of the samples show enrichment of light rare earth elements and flat pattern of heavy rare earth elements; such patterns imply dominance of felsic composition rocks in the provenance. Further, these samples show quite resemblance with Charnockites and Gneisses of Palani and Kodaikanal hill areas. Chondrite-normalized REE patterns of the Pleistocene sediments of Uttrangudi core show similar abundance, fractionation, and Eu anomaly values as of selected samples from Tertiary rocks near southwest part of the delta. We attribute the increased input from this region to the upliftment because of tectonic activity and lowering of sea level during the Pleistocene.