浙江湖南镇水库1982年5月22日3.1级地震序列的近场地声观测和初步研究
NEAR-FIELD OBSERVATION AND PRELIMINARY STUDY ON THE GEOSOUND GENERATED BY THE MAGNITUDE 3.1 EARTHQUAKE SERIES IN HUNANZHEN RESERVOIR, ZHEJIANG. ON MAY 22, 1982
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摘要: 本文介绍湖南镇水库1982年5月22日ML=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。其经由地面透射与空气耦合后形成可听地声。地声活动性在3.1级主震前后呈明显的阶段性变化特征。地声频率为60——250Hz,其加速度功率谱主频率fD为80——150Hz。研究了主频率的时间序列,发现前震期地声主频率由高值向低值转移,主震时达极低值。余震期内,主频率则由低值向高值回升,fD与ML呈幂函数关系fD=130.7(ML+2)-0.3。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。它表明,在矿山和地震活动区进行近场地声连续观测和实时分析,对岩爆和地震过程的预测有重要意义。Abstract: The results of near-field observation and perliminary study on the geosounds associated with the magnitude 3.1 earthquake series in Hunanzhen reservoir area on May 22,1982 are presented in this paper. The observations show that every earthquake event was accompanied by geosound. The audible earthquake sounds are generated by near-vertically incident high frequency elastic waves,geosound,radiating from the related earthquakes and coupling directly into the atmosphere through local ground motion on the earth's surface. The activity of geosound shows a characteristic change by stages during the development of the earthquake series of magnitude 3.1. The; frequencies of geosounds are between 60 to 250 Hz. The dominant frequencies of the acceleration power spectrum of geosounds are between 80 to 150 Hz. The time series of dominant frequencies have been studied,from which we find that the dominant frequencies of geosounds decrease gradually during the foreshock period,and become lowest at the time of the main shock of magnitude 3.1,but during the after shock period the dominant frequencies gradually increase. The related function is given by fD=130.7(ML+2)-0.3,The study indicates that the relation of the dominant frequencies to time and earthquake magnitude mainly depends on the fracture size of the earthquake source and also on the stress state and quality factor,Q,of rock at the source. The results of observation and studies arc consistent with the experimental studies in recent years,on the fractur-ing processes and spectral characteristics of acoustic emission of rocks,and indicate that continuous observation and analysis in seismic fault zones and mine are significant for the prediction of rockbursts and large earthquakes.
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[1] Hill, D. P., F. G. Fischer, K. M. Lahr and J. IVi. Coakley, Earthquake sounds generated by body——waves ground motion, Bull. Seism. Soc. Am., 66, 4, 1157——1172, 1976.
[2] Tian Shixiu and Wu Fukung, Observation and study of geosound prior to earthquakes in the Tang——shan region, ISCSEP., Beijing, 1982.
[3] 中国科学院生物物理研究所十一室地声组,余震期间的地声观测研究,地震科学研究,1, 1, 25——32, 1980.
[4] 胡毓良,陈献程,浙江湖南镇水库区地震成因的初步探讨,地震地质,4, 3, 46——19,1982,
[5] 楠獭勤一郎,轴压上异伴弓微小破坏振动。周波数特征。变化,日本地震学会1978年春季大会讲演予稿集,1978,
[6] Ohnaca, M. and K. Mogi, Frequency characteristics of acoustic emission in rocks under uniaxial compression and its relation to the fracturing process to failure. Geoph.ys. Res. 8, (B5), 3873——3884, 1982.
[7] Zhao Shuqing, Ma Jin, Wang Baosheng and Wang Tongjun, Frequency characteristics of acoustic emission during fracturing of rock specimens, Annual Review of Chinese Science Review of Geological and Geophysical Science, (in press)
[8] Armstrong, B. H., Acoustic emission prior to rockbursts, earthquakes, Bull. Seism. Soc. Am. 59, 3.1259——1279.
[9] 刘祖沉,胡毓良,陈颗,单轴压缩下岩石超声P波衰减,地球物理学报,27, 4, 349——358, 1984,
[10] 刘祖沉,岩石中地震波衰减的实验研究,地震科学研究,6, 34——40, 1983,
[11] Suyehiro, S., Change in earthquake spectrum before and after the Matsushiro swarm, Papers in Meteorogy and Geoplaysics, 123, 1968.
[12] 朱传真,石汝斌,冯胜利,安镇文,新疆西克尔地区微震波谱的初步研究,地球物理学报,18, 4, 256——268,1975.
[13] Sadovsky, M. A., I. L. Nersesov, S. K. Nigmatullaov et al. The precesses preceding strong earth quakes in some regions of middle Asia, Tectonophysics, 14, 3/4, 295——307, 1972.
[14] Ishida, M,and H. Kanamori, Temporal variation of seismicity and spectrum of small earthquakes preceding the 1952 Kern county, Califoria, earthquake, Bull. Seism. Soc. Am. 70, 509——523, 1980.[1] Hill, D. P., F. G. Fischer, K. M. Lahr and J. IVi. Coakley, Earthquake sounds generated by body——waves ground motion, Bull. Seism. Soc. Am., 66, 4, 1157——1172, 1976.
[2] Tian Shixiu and Wu Fukung, Observation and study of geosound prior to earthquakes in the Tang——shan region, ISCSEP., Beijing, 1982.
[3] 中国科学院生物物理研究所十一室地声组,余震期间的地声观测研究,地震科学研究,1, 1, 25——32, 1980.
[4] 胡毓良,陈献程,浙江湖南镇水库区地震成因的初步探讨,地震地质,4, 3, 46——19,1982,
[5] 楠獭勤一郎,轴压上异伴弓微小破坏振动。周波数特征。变化,日本地震学会1978年春季大会讲演予稿集,1978,
[6] Ohnaca, M. and K. Mogi, Frequency characteristics of acoustic emission in rocks under uniaxial compression and its relation to the fracturing process to failure. Geoph.ys. Res. 8, (B5), 3873——3884, 1982.
[7] Zhao Shuqing, Ma Jin, Wang Baosheng and Wang Tongjun, Frequency characteristics of acoustic emission during fracturing of rock specimens, Annual Review of Chinese Science Review of Geological and Geophysical Science, (in press)
[8] Armstrong, B. H., Acoustic emission prior to rockbursts, earthquakes, Bull. Seism. Soc. Am. 59, 3.1259——1279.
[9] 刘祖沉,胡毓良,陈颗,单轴压缩下岩石超声P波衰减,地球物理学报,27, 4, 349——358, 1984,
[10] 刘祖沉,岩石中地震波衰减的实验研究,地震科学研究,6, 34——40, 1983,
[11] Suyehiro, S., Change in earthquake spectrum before and after the Matsushiro swarm, Papers in Meteorogy and Geoplaysics, 123, 1968.
[12] 朱传真,石汝斌,冯胜利,安镇文,新疆西克尔地区微震波谱的初步研究,地球物理学报,18, 4, 256——268,1975.
[13] Sadovsky, M. A., I. L. Nersesov, S. K. Nigmatullaov et al. The precesses preceding strong earth quakes in some regions of middle Asia, Tectonophysics, 14, 3/4, 295——307, 1972.
[14] Ishida, M,and H. Kanamori, Temporal variation of seismicity and spectrum of small earthquakes preceding the 1952 Kern county, Califoria, earthquake, Bull. Seism. Soc. Am. 70, 509——523, 1980. -
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