用计算机确定地震参数的一个通用方法
A GENERAL METHOD FOR DETERMINATION OF EARTHQUAKE PARAMETERS BY COMPUTER
-
摘要: 本文叙述了在走时表已知的情况下, 根据单一或几种震相确定地震参数的一般方法.我们把问题归结为求某个准则函数的极小值, 并提出在计算机上用一种有效的直接搜索法——鲍威尔(Powell)搜索法求解.使用该方法对迭代的初值的要求可以比较低, 一般只要选到时最小的台站的位置作为初始起点.对来自单一震相, 二种震相或不明震相的初动的到时数据的参数测定问题作了详细的说明, 并列出了几个数值结果.本文还大致说明了在几个台网记录到的100多个地方震和近震的计算情况.Abstract: In this paper, a general method has been developed for determining earthquake parameters on basis of one or several phases of recorded waves when the travel time tables are given. The problem is reduced to minimizing some criterion function. On the computer an efficient and direct searching technique, the Powell method is proposed. This technique allows the requirements to the starting value to be less critical. Generally, the location of a station with the least arrival is selected as a start. From the arrival data of a single phase, two phases and the first motion of unknown phases, the determinations of parameters of earthquakes are illustrated and some numerical examples given. Computations for more than 100 local and near earthquakes recorded by certain seismic station networks are described.
-
-
[1] W. H. K. Lee and J. C. Lahr, A computer program for determining hypoconter, magnitude and first motion pattern of local earthquakes (HYPO71), U. S. G. S., Open report 1972.
[2] E. A. Flin, Local earthquake with an electronic computer, Bull. Seism. Soc, Am., 50, 3, 467—470, 1960.
[3] V. I. Keilis—Borok. et, al., Computer determination of earthquake epicenters, Computational Seismology, 13—15 (Translated from Russian), 1972.
[4] 国家地震局地球物理研究所, 近震分析, 地震出版社, 1978.
[5] M. J. Powell, An efficient method for finding the minimum of a function of several variables without calculating derivatives, Computer J. 7, 2, 155—162, 1964.
[6] A. Ralston, H. S. Wilf, Mathematical methods for digital computers, 95—111, 1960.
[7] 吴方, 关于Powell方法的一个注, 数学学报, 20, 1, 14—15, 1977.
计量
- 文章访问数: 1214
- HTML全文浏览量: 9
- PDF下载量: 146
下载:
