地下水非稳定流排放诱发地表位移的精密计算

基于地下水非稳定流Ｔｈｅｉｓ理论，导出了地下水非稳定径向辐射渗流单井排放诱发的地表位移的解析表达式，阐述了计算方案，并以２０个节点的Ｈｅｒｍｉｔｅ求积公式编制了相应的数值积分计算程序，给出了模拟计算实例。在地下水非稳定流场地区进行高精度动态大地测量时，可按照这一计算方法，精密顾及地下水排放所诱发的地壳形变对测站的影响。

RELATIONSHIP BETWEEN WAVELET ANALYSIS RESULTS OF GRAVITY AND EARTHQUAKES IN HEXI REGION

The probability of wavelet analysis applying to gravity change data processing is discussed. Based on cardinal B spline function ,the plane multiresolution analysis and wavelet transform formulas are derived. At the same time ,the gravity data measured from 1992 to 1994,1994 to 1995,1995 to 1996 in Hexi region, northwest Gansu province of China, are calculated with the wavelet transform.The results are:(1)The gravity change can be filtered by the wavelet transform effectively,therefore,the wavelet transform is a powerful tool to analyse the relationship between gravity change and seismicity.(2)The first order wavelet result of which caused by shallow material density change of the earth and the fourth order wavelet result of gravity change caused by deep layer material density change of the earth do not obviously change before Yongdeng M s5.8 in 1995 and Gulong M s5.3 in 1996 earthquakes. (3)The second and third wavelet result of gravity change caused by middle layer material density change of the earth take place obviously change near the earthquake area before above two earthquakes.