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本文用西南地区短周期地震台网记录的地震资料研究了不同类型的短周期地震仪器以及区域性近震地震波的衰减特征对测定近震震级M_L的影响。结果表明: (1)目前区域性台网常用的几种短周期地震仪器记录测定的近震震级M_L间几乎无系统差。 (2)云南地区地震波随震中距Δ的区域性衰减规律基本一致。对量规函数与地震波衰减特征相互间的讨论,结论给出该区测定近震震级可以使用统一的量规函数。
In this paper, the seismic data recorded by the short-period seismic network in Southwest China are used to study the effects of different types of short-period seismic instruments and attenuation characteristics of regional near-surface seismic waves on the determination of near-Earthquake magnitude M_L. The results show that: (1) There is almost no systematic difference between the near-Earthquake magnitude M_L measured by several short-period seismic instruments commonly used in the regional network. (2) The regional attenuation law of the seismic wave amplitude along the epicenter in Yunnan is basically the same. The discussion between the gauge function and the attenuation characteristics of seismic waves is discussed. The conclusion is given that a unified gauge function can be used to determine the near-earthquake magnitude in this area.