深部电性变化前兆大地电磁测深法的可分辨性

林长佑; 刘晓玲; 武玉霞

深部电性变化前兆大地电磁测深法的可分辨性

国家地震局兰州地震研究所

基金项目: 地震科学联合基金项目

计量
- 文章访问数: 1718
- HTML全文浏览量: 433
- PDF下载量: 107
出版历程
- 收稿日期: 1988-04-09
- 刊出日期: 1990-03-14

THE RESOLUTION OF THE MAGNETOTELLURIC SOUNDING FOR THE PRECURSOR OF DEEP ELECTRICAL VARIATION

Seismological Institute of Lanzhou, SSB

摘要

摘要: 本文分析了地表各处起因于深部电性变化前兆的大地电磁响应函数的变化形态、特征,探讨了对此大地电磁测深法的可分辨性的某些问题。研究表明,在离震中稍远的震源外围区,由扩展膨胀各向异性所引起的深部电性变化引起了某些大地电磁响应函数明显的可分辨的变化;发展中的地震断裂带和震前断裂蠕滑段,作为一个两维导电沟,可以引起邻近区域视电阻率,阻抗相位、维系数的可分辨的变化;对于一个异常的震源导电体,地表大地电磁响应函数显示出了两维模拟异常的某些类同和差异。

Abstract: In this paper the variation pattern and the character of the magnetotelluric (MT) response functions at various positions on the earth surface, which are due to the deep electrical variation, are analysed, some problems of the resolution of MT sounding for them are discussed priliminarily. It is indicated that in regions around focus, farther from the epicentre, the deep electrical variation, due to the extensive-dilatancy anisotropy (EDA), leads to the distinguishable variations of MT response functions; the earthquake fault during the development and the creep portion of fault before earthquake, as a conductive dike, can lead to distinguishable variations of the apparent resistivity phase of impedance, dimensional coefficients in its nearby region; for an anamalous conductive focal volume, the MT response functions at earth surface appear to be either some analogous to or different from the results of two-dimensional models.

HTML全文

参考文献(14)

[1]	林长佑、武玉霞、刘晓玲,地震深部电性变化前兆特征及其机理的初步探讨,西北地震学报, 11,4,1989.
[2]	D'brien, Douglas P. and Morrison,H.F.,Electromagnetic fields in an N-layer anistiopic half-space,Geophys.,1967,Vol.32,No.4,668-677.
[3]	林长佑、武玉霞、刘晓玲,大地电磁响应函数的除偏估算和误差研究,西北地震学报, 10,3,1988.
[4]	兰州地震研究所大地电磁测深组,南北地震带北段地完土地但内的高导层与地震关系的研究,勘探地球物理专辑,第二辑,电磁测深, 145-150,地质出版社,1987.
[5]	林长佑,刘晓玲,武玉霞,试论大地电磁测深法在地震前兆探索中的应用,地震学报(于发表).
[6]	Верднчовскнй, М.Н., Голубцова, Н,С.ц Дебабов, А.С., Магнитотеллуоическое зондированиэ над трехмерной впадиной, Физика Земли. 1984,12,80-88.
[7]	Adam,A.,Fractures as conducting dykes and corresponding two-dimensional models, Geophys.Prosp.,1984,Vol.32,NO.4,53-553.
[8]	Vozoff,Keeva,The magnetotelluric method in the exploration of sedimentary basins. Geophys., 1972,Vol.37,No.1,98-141.
[9]	Reddy,I.K.and Rankin, D.,Magnetotel1uric response of lateral1y in homogeneous and anistropic media,Geophys.,1975,Vol.40,No.6,1035-1045. [l0] Cagniard,Louis.Basic theory of the magneto-telluric method of geophysical prospecting Geophys.,1953,Vol.18,No.3,605-635.
[10]	Berdichevsky,Mark N.and Zhdanov,Michael S.,Advanced theory of deep geomagnetic sunding,Elsevier,1P84,118,129,324.Amsterdam et al.
[11]	Берцйчевс кий, М.Н, Нечаева, Г. П.и Лебеgева, Н.А., Маг ни то теллуричес кое зондирование над ограниченным пластом, Фи з ика Земли, 1981, 68-72.
[12]	Бердичевский, М,Н. и др., О Магни то теллуричес ком зонди-рование нроводяши зон в земной коре и верхний мантии, Физика Земли, 1982, 7, 55-38.
[13]	Park,Stephen K.,Distortion of magnetoetelluric sounding Curves by three-dimensional structure,Geophys.1885, Vol. 50, NO.5,785-797.
[14]	Newman,Gregory.A.,Wannamaker. Pilip. E. and Hohman,Gerald W.,On the detectability of crustal magma chambers using the magnetotelluric method,Geophys.,1985, Vol.50,No.7,1136-1143.

施引文献

资源附件(0)

计量

文章访问数: 1718
HTML全文浏览量: 433
PDF下载量: 107
被引次数: 0

深部电性变化前兆大地电磁测深法的可分辨性

计量

出版历程

THE RESOLUTION OF THE MAGNETOTELLURIC SOUNDING FOR THE PRECURSOR OF DEEP ELECTRICAL VARIATION

计量

出版历程

目录