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在测定近震震级 M_L 方面,目前存在一些问题。过去我国这方面的工作着重于观测资料的分析、解释和统计方面,在本文中我们将围绕 M_L 的原始定义,首先讨论原始量规函数 R(△)本身存在的问题,指出在△<100公里范围内,R_O(△)运用在南加州亦有系统误差。然后讨论了我国目前 M_L 的测定中存在的三个基本问题:即建立各个不同地区的量规函数的问题,我国 M_L 的零点和原始定义的零级地震相衔接的问题及各种 Wood-Anderson 地震仪对测定 M_L 的影响的问题,同时讨论了近场综合地震图方法对解决这三个基本问题昕可能起到的作用。
In the determination of near magnitude M_L, there are some problems. In the past, our work in this area focused on the analysis, interpretation and statistics of observation data. In this paper, we will focus on the original definition of M_L, first of all discuss the problems existing in the original gauge function R (△) itself, pointing out that in △ <100 km range Within, R_O (△) is also used in Southern California system error. Then, we discuss the three basic problems in the current M_L measurement in our country: the problem of establishing the gauge function in different regions, the connection between the zero point of M_L in China and the originally defined zero-order earthquake, and the various Wood-Anderson seismometers It also discusses the effect that near-field synthetic seismograms can have on solving these three basic problems.