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本文介绍湖南镇水库3.1级地震序列的近场地声观测和初步研究结果。观测表明,每一次地震都伴随地声;地声系相应地震事件辐射的高频弹性体波,透射到空气中的可听地声;地声活动性在主震前后呈明显的阶段性变化特征;地声频段为50～250赫兹,其加速度功率谱主频率f为80～150赫兹。研究表明,地声主频率与时间、震级的相关性主要取决于震源破裂尺度,同时也与震源介质的应力状态和品质因数Q值变化有关。3.1级地震序列的近场地声观测和研究结果与近年来国内外由岩石破裂过程与声发射活动性和波谱特征的实验研究结果颇为一致。
This paper introduces the near-field acoustic measurements and preliminary results of the 3.1-magnitude earthquake sequence in Hunan Province. The observations show that every earthquake is accompanied by earthquakes; the high-frequency elastic wave radiated by the corresponding acoustic events of the geosyphons is audible ground sound transmitted into the air; and the acoustic activity of the earthquakes shows obvious phase changes before and after the main shock ; Acoustic frequency band is 50 ~ 250 Hz, the main frequency of the acceleration power spectrum f is 80 ~ 150 hertz. The results show that the correlation between ground acoustic frequency and time and magnitude mainly depends on the source rupture scale and the stress state and the Q factor of quality factor. The near-field acoustic observations and research results of the 3.1 magnitude earthquake sequence are in good agreement with the experimental results of the rock burst process and acoustic emission activity and spectral characteristics at home and abroad in recent years.