| 重力仪高频信息和地脉动的观测研究 |
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| 引用本文： | 陈益惠,雷雨田,朱涵云,郭自强.重力仪高频信息和地脉动的观测研究[J].地球物理学报,1988,31(5):527-539. |
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| 作者姓名： | 陈益惠 雷雨田 朱涵云 郭自强 |
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| 作者单位： | 国家地震局地质研究所 北京 |
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| 摘 要： | 本文介绍了应用电磁反馈零位检测技术改装的重力仪进行高频信息的观测。阐述重力仪高频信息频谱分布特征、数据采集、数字计算和随机信息的处理方法。利用高频信息可以很好地观测和研究地脉动,给出北京香山地震台利用重力仪高频信息观测所得的地脉动功率谱。分析了地脉动特征及其与台风过程的关系;讨论了某些大地震前所出现的地脉动异常现象。得出北京地区正常地脉动频率分布范围为0.13-0.32Hz,优势频率为0.2Hz,相应的卓越周期为5s的脉动频率异常,也可能在地脉动的正常频率处（0.2Hz左右）,出现幅度很大的脉动幅度异常,后者又往往与台风引起的幅度异常相混淆。
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| 关 键 词： | 重力仪 高频信息 地脉动异常 |
| 收稿时间： | 1986-12-10 |
STUDIES ON HIGH-FREQUENCY SIGNALS OF GRAVIMETER AND MICROSEISMS |
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| CHEN YI-HUI LEI YU-TIAN ZHU HAN-YUN Guo ZI-QIANG.STUDIES ON HIGH-FREQUENCY SIGNALS OF GRAVIMETER AND MICROSEISMS[J].Chinese Journal of Geophysics,1988,31(5):527-539. |
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| Authors: | CHEN YI-HUI LEI YU-TIAN ZHU HAN-YUN Guo ZI-QIANG |
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| Affiliation: | Institute of Geology, Stale Seismological Bureau, Beijing |
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| Abstract: | High-frequency signals of gravimeter are superposed on the tidal signals. Usually they are filtered out as disturbing noises on studying earth tides. We devised a simple magnetic feedback device with GS-15 gravimeter. Instantaneous signals of the beam through null position are amplified and can be recorded. They are transient high-frequency (2-100 s period) signals. The signals are recorded in a digital recorder and processed as random information to calculate their spectrum properties, including power spectrum. The computed results indicate that the high-frequency signals are mainly composed of microseisms, disturbance due to thermostat of gravimeter and seismic, wave disturbance after strong earthquakes.A special method is used to analyse gravimeter's highfrequency response. It has been found that the gravimeter can make immediate responses to the signals with periods greater than 2 sec. Therefore the microseisms caused by ocean wave can be observed by gravimeter with feedback device successfully.The results of power spectrum from observation of microseisms in Xiang Shan Station (Beijing) indicate that the frequencies of microseisms in Beijing are about between 0.13-0.32 Hz (7.7-3.1 S), with a peak frequency 0.2 Hz (5S). The freguencies of microseisms have no change during storms, but the values of amplitude may increase rapidly or keep constant.We pay great attention to the phenomenon of microseism anomaly which has no relation with storms. Anomaly of periods of microseisms or anomaly of amplitude of peak power spectrum of microseisms has been observed before some strong earthquakes. We think it's hopeful to predict earthquake by investigating microseism anomaly further. |
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| Keywords: | High-frequency signal Microwistn Spectrum Earthquake |
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