天山的壳内高导层与震源环境   总被引：2，自引：0，他引：2  

胥颐  王克元 《内陆地震》1995,9(2):112-117

对天山地震区存在的壳内高导层和高导层所在地区发生地震的震源深度进行了研究，发展地壳中部的高导层与地震带的震源分布有一定的对应关系，震源深度存在由北向南逐渐加深的趋势，而且与高导层的埋藏深度相当。研究认为，高导层是表征深部震源环境的重要方面之一，它的形成与存在既有内在的原因也应具备一定的外部条件。  相似文献   

利用大地电磁测深法识别EDA地震电性变化前兆          下载免费PDF全文

林长佑  武玉霞  杨长福  陈军营 《地震工程学报》1995,17(4):89-98

论述了起因于ＥＤＡ现象的地球介质电导率各向异性特征，分析研究了地球介质是忸率各向异性变化引起的大地电磁响应函数变化形态特征，简述了大地电磁测深法对ＥＤＡ电性变化前兆的可识别性及大地电磁资料解释中考虑电导率各向异性的必要性，研究了对称各向异性层状介质大地电磁资料的反演问题。  相似文献   

陕西地区单台Z／H地磁测深研究   总被引：3，自引：0，他引：3  

杜兴信  鲁秀玲 《地震地磁观测与研究》1995,16(1):27-34

应用陕西地磁台网Ｓｑ资料和单台Ｚ／Ｈ地磁测深法对陕西地区地下电导率分布进行了研究，结果表明，理想代换导体视探ｈ约为５００ＫＭ，电导率σ为０．０７ｓ／ｍ（周期为１２小时），且存在２５０ＫＭ和７００ＫＭ深度附近的高导层，感应比例尺度实部Ｃ＾１ｒｅａｌ和Ｃ＾２ｒｅａｌ及内外场之比│Ｑ＾１│和│Ｑ＾２│似有１１年周期变化。各台测定的结果相当接近，和其他方法测定的范围结果基本一致。用冬夏季静日均值结果较春秋  相似文献   

The depth of Moho in the mainland of China   总被引：1，自引：0，他引：1  

曾融生  孙为国  毛桐恩  林中洋  胡鸿翔  陈光英 《地震学报(英文版)》1995,8(3):399-404

ＴｈｅｄｅｐｔｈｏｆＭｏｈｏｉｎｔｈｅｍａｉｎｌａｎｄｏｆＣｈｉｎａＲｏｎｇ－ＳｈｅｎｇＺＥＮＧ；（曾融生）Ｗｅｉ－ＧｕｏＳＵＮ；（孙为国）Ｔｏｎｇ－ＥｎＭＡＯ（毛桐恩）ＺｈｏｎｇＹａｎｇＬＩＮ；（林中洋）Ｈｏｎｇ－ＸｉａｎｇＨＵ；（胡鸿翔）ａｎｄＧ...  相似文献   

The separation and parameter determination of PS converted phases in deep sounding by converted waves of earthquakes     

Jia-Ru Zhang  Xue-Zhong Shao  Wei-An Gao 《地震学报(英文版)》1993,6(2):417-425

The practice of deep sounding by converted waves of Earthquakes shows that the time duration of the PS converted phases is usually longer than the arrival time delay between the converted phases coming from the adjacent boundaries. So, the mutual interference of the converted phases from adjacent boundaries may form a complicated interference series of the waves. It is difficult to recognize and determine exactly the parameters of the converted waves in the interfering records. In this paper the method of omni-azimuthal polarization analysis and the method of separation of interfering waves are described. The theoretical examples show that the procedure given in the paper is rather effective to separate the interfering waves and to determine their parameters, and so, is important to improve the resolving power and the reliability of the method of deep sounding by converted waves of earthquakes. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 39–45, 1993. The research reported here is a part of proposal sponsored by State Seismological Bureau and China Joint Seismological Science Foundation.  相似文献   

Research on amplitude spectrum of precursory electromagnetic radiation associated with the impending great earthquake of Gonghe in Qinghai Province     

Yun-Lin Zhang  Hai-Jing An  Xiao-Ling Liu  Yu-Lan Si  Mei Jiang  Wu-Si Zhang 《地震学报(英文版)》1993,6(3):675-683

The high accuracy, automatic, digital MT measurement system with five electromagnetic components was firstly adopted by the author to the section MT monitor and measurement in the middle Qilian mountain in the Northwestern China, the more real precursory information of impending earthquake electromagnetic rediation of GongheM=7.0 earthquake (April, 1990) in Qinghai province was obtained by the system. The new complete quantification frequency analysis was firstly used in this paper in both time and space domains for the analysis of repeated measurement data at all sites. This paper concludes the precursory spectral characteristics of electromagnetic radiation before strong earthquake as following: 1. The spectra appears as the synchronous electric field interference type mainly of conduction current; 2. Narrow band (0.5 – 20s) of spectral period; 3. The singularity of amplitude (the pulse amplitudes of interference electric field is 10² times the normal values); 4. They show the directionality of preparing focus to some extent; 5. The intermittent of radiation (three peak periods appeared three days before the main shock). It is more significant that there existed a relative quiet period of about 48 hours between the peak period and the occurrence, observators can response quickly at observational sites and take it as one of the observational criterions for impending prediction. This paper also points out that the impending earthquake electromagnetic radiation obtained by the MT measurement system is mainly the conduction current, and the high-conductive layer existed commonly in the crust may serve as the better paths for the conduction current circuit and enables the far away MT measurement sites to receive it. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 186–193, 1993.  相似文献   

差异激电法探查地下水及区分矿种的初步研究     

曾森甫  许建仁 《物探与化探》1993,17(5):362-367

本文提出激发极化差异效应和激电差的概念并给出定义,首次使用“差异激电法”这一述语。通过在平原和山区的贫水及富水区的应用以及室内金属板、石墨板和金属矿物、炭质岩石标本的水槽模拟实验,说明基于激发极化差异效应的差异激电法在探查地下水以及找矿、区分矿种方面的有效性,初步探索了异常反映规律。  相似文献   

K法克服电阻率测量中的似非而是现象     

汤洪志 《华东地质学院学报》1993,16(1):75-80

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物化探综合研究新疆阿尔泰多金属成矿带     

Xu Baoci Zhang Guibin Li Chunhua Meng Xiaohong 《吉林大学学报(地球科学版)》1990,(1)

以新疆HM-76工区地面重磁测量数据为基础,在完成多种场数据处理变换后,利用“集块理论”求得磁性体的顶、底深度;然后结合地质及其它物化探资料,对该工区重新进行了综合研究,提出几点新认识:(1)HM-76工区具备多金属成矿靶区良好的地质前提;(2)HM-76负磁异常可能由自身反转磁化所引起;(3)主体地质体可能为一近直立的截面似椭圆的向下延伸基性—超基性柱体;(A)主体与围岩接触带可能是有希望的多金属成矿带。其上几个呈弧形排列的重磁局部异常可能由强磁、高密度、强极化矿体引起。  相似文献   

福州-泉州-汕头地区地壳结构的爆炸地震研究   总被引：71，自引：7，他引：71       下载免费PDF全文

廖其林  王振明  王屏路  余兆康  吴宁远  刘宝诚 《地球物理学报》1988,31(3):270-280

本文根据1982和1985年在福州-泉州-汕头地区的人工爆炸地震测深资料,分析了震相特征,共识别到九个波组:P₁、P_g、P_g^′、P₃^°、P₄（P₄^°）、P₅^°、P_n（P_n^°）、P₇^*及S波组。通过对波的走时反演、正演拟合、理论地震图和射线追踪方法反复计算,得到了该区地壳与上地幔结构模型。结果表明,该区具有大陆地壳向海洋地壳过渡的边缘地区结构特征。地壳P波速度6.30km/s,莫霍面速度7.90km/s,地壳厚度30km,由三层构成,厚度分别为3km、15km和12km。在中地壳存在一层速度为5.50-5.90km/s、厚度为3.0-4.0km的低速层,低速层分布与温泉出露有密切的关系。在下地壳下部有一数公里厚的高速致密的壳-幔混合物层,其形成原因是由于上地幔物质上涌并迁移到下地壳的结果。此外,还讨论了莫霍面结构,界面起伏和断裂展布概况。  相似文献