| 新疆西克尔地区微震波谱的初步研究 |
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| 引用本文： | 朱传镇,石汝斌,罗胜利,安镇文.新疆西克尔地区微震波谱的初步研究[J].地球物理学报,1975,18(4):256-268. |
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| 作者姓名： | 朱传镇 石汝斌 罗胜利 安镇文 |
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| 作者单位： | 中国科学院地球物理研究所 |
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| 摘 要： | 为探索大地震发生前孕震区内微震辐射波谱的变化,在新疆西克尔地区,用选频测震仪对微震波谱进行了观测和研究。选频测震仪分为6个频道,各道中心频率分别为6.0周、8.1周、15.7周、30.0周、50.0周、75.0周。初步结果表明:在一个地震系列中,随着临近较强地震（ML≥3.2）的发生,微震P波在10周-60周频率范围内的谱值增高,其置信水平一般在70％以上。较强地震发生以后,微震P波在相应频率范围内的谱值下降。 文中还简要地分析了选频地震记录的物理意义,并对较强地震前,微震辐射波谱变化的原因作了初步说明。
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| 关 键 词： | 微震 波谱 选频 地震P波 震源 辐射波 平均谱 大地震 测震仪 新疆 |
PRELIMINARY STUDY OF THE SPECTRA OF MICROEARTH- QUAKE WAVES IN XIKER REGION,XINJANG CHINA |
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| ZHU CHUAN-ZHEN SHI RU-BIN LUO SHENG-LI AN ZHEN-WEN.PRELIMINARY STUDY OF THE SPECTRA OF MICROEARTH- QUAKE WAVES IN XIKER REGION,XINJANG CHINA[J].Chinese Journal of Geophysics,1975,18(4):256-268. |
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| Authors: | ZHU CHUAN-ZHEN SHI RU-BIN LUO SHENG-LI AN ZHEN-WEN |
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| Institution: | Institute of Geophysics, Academia Sinica |
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| Abstract: | In order to study the characteristic variations of the spectra of microearthquake waves preceding larger earthquake occurrences, a series of microearthquakes in Xiker region of Xinjang was observed and investigated by using a selected band-pass seis-mograph, which is composed of 6 filtering channels with central frequencies 6 cps, 8.1 cps, 15.7 cps, 30.0 cps, 50.0 cps. 75.0 cps respectively. The preliminary results show that the amplitudes of the spectra of microearthquake P waves in the frequency range 10 cps-60 cps increase before the occurrences of larger earthquakes （ML≥3.2）, and decrease after them within the corresponding frequency ranges. The confidence level is more than 70% in general.The physical implication of the recorded effect of the selected band-pass seismo-graph is analysed in brief, and the causes of variation of the microearthquake wave spectra before larger earthquakes are discussed very concisely. |
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