一、前言我国在地方性微弱地震的研究中,主要是使用烟紙記录的581型微震仪。从数年来野外观測的結果表明:在設备条件較差的情况下,仪器性能有所降低,因而有改进的必要。今对观測中出現的一些問題,即放大倍率的稳定性、頻带的展寬、笔尖摩擦影响和时間服务等問題作了一些討論,并在此基础上制作了改进的模型。 I. Preface In our study of the local weak earthquakes, the 581 type microseismometer mainly recorded with cigarette paper was used. The results of field observations over the past few years show that the performance of the instrument has been reduced in the case of poor equipment conditions and there is therefore a need for improvement. Now some problems appeared in the observation, such as the stability of the magnification, the broadening of the frequency band, the influence of the pen tip friction and the time service are discussed. Based on this, an improved model is made.