华东鲁苏皖豫邻接地区流动地磁测量结果初步分析
A PRELIMINARY ANALYSIS ON THE DATA OF THE MOBILE GEOMAGNETIC MEASUREMENTS IN THE JOINT AREA OF PROVINCES OF SHANDONG JIANGSU ANHUI AND HENAN OF EASTERN CHINA
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摘要: 本文用趋势面分析的方法对1976年8月起在华东鲁、苏、皖、豫交界一带开展的流动地磁测量结果进行了分析.这一分析表明,观测结果主要反映了地磁场的正常变化,趋势变化部分是地磁场长期变化.测区内各测点的长期变化速率不尽相同,而是呈现一定空间分布上的规律性.这一结果与其他资料所得的长期变化空间分布特征相一致.测区内未发现有局部地磁长期变化异常.整个测区的观测精度约3.0伽马,大部分测点观测结果中的残差变化基本在观测精度范围内.但1979年3月2日固镇 MS=5.0地震前后震中附近测点呈现了超出观测误差的可能磁异常变化.Abstract: In this paper, by using the method of trend surface analysis, the data of mobile geomagnetic measurements in the joint area of provinces of shandong, Jiangsu, Anhui and He-nan from August 1976 to November 1979 are analysed. Preliminary analysis shows that the geomagnetic variation in the are a is of normal magnetic variation. The trend part of the variation is the secular geomagnetic variation. The secular variation rates are not entirely the same for each locality in the area. But the spatial distribution of the rates reveals certain regularity. The character of the secular variation agrees with that obtained on the basis of other geomagnetic data. No anomalous local secular geomagnetic variation has been found in the area. The accuracy of determination of this observational system is about 3.0 r . The variations of the residuals of most of the points are within the observational error .But before and after the Guzhen (固镇) Earthquake (Ms=5.0) on March 2, 1979, the variations of residuals of the points around the epicentre-seem to be anomalous, exceeding the observational error.
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[10] T. Nagata, Tectonomagnetism, 1969, Bulletin, 27,1974.[1] 范国华等,唐山地震对北京地区地磁场总强度的影响,地震学报1, 1, 39 —— 48,1979.
[2] M.Davis, et al., Further Evidence of Localized Geomagnetic field Ahanges before the 1974
[3] Thanksgiving Day EArthquake. Hollister California, GeoPhys. yes. Letters, 7, 513——516, 1980.
[4] M. Fisz,概率论及数理统计(中译本,王福保译),科学技术出版社,197 8,
[5] 中国科学院地质研究所,数学地质引论,地质出版社,1978.
[6] 卢振业等,华北地磁场长期变的空间分布模式及其应用,地震科学研究,3, 18——24,1981.
[7] A. C.契巴塔廖夫,最小二乘法与或然率理论基础(中译本,楼成器译),中国工业出版社,1964.
[8] 王梓坤,概率论基础及其应用,科学出版社,1979.
[9] 祁贵仲,"膨胀"磁效应,地球物理学报,21,18——33,1978.
[10] T. Nagata, Tectonomagnetism, 1969, Bulletin, 27,1974.
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