| 泰安地震台重力扰动现象研究 |
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| 引用本文： | 王,梅,季爱东,曲同磊,徐长朋,王,鹏,佟瑞清.泰安地震台重力扰动现象研究[J].地震学报,2014,36(3):443-451. |
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| 作者姓名： | 王 梅 季爱东 曲同磊 徐长朋 王 鹏 佟瑞清 |
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| 作者单位： | 中国济南 250014 山东省地震局 |
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| 基金项目： | 国家科技支撑计划项目(2012BAK19B04-01);山东省地震局重点科研基金(JJ1201)共同资助 |
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| 摘 要： | 利用滤波分析法对山东泰安地震台重力固体潮观测的分析表明，重力观测中存在大量高频扰动信号.通过与气象观测实况资料的对比发现，这些异常扰动信号除了受台风等热带气旋影响外，还明显与“冷空气”过境等区域强对流天气有关. 对泰安台JCZ-1甚宽频带地震仪观测资料的频谱分析和滤波处理进一步表明，区域强对流天气及台风对重力仪的影响频段均在1—8 s范围内，其中2—6 s区间影响最为显著； 强对流天气过程触发的扰动信号范围可以在1—16 s，但8 s后扰动信号对重力仪观测基本不造成影响，即重力仪对高频扰动信号的响应存在8 s的截止周期.JCZ-1甚宽频带地震仪的波谱分析还反映出扰动信号的动态特征，即强对流天气产生的扰动信号在发展、传播过程中，首先出现的信号频率较高，随着时间推移信号逐渐向低频演化，揭示了干扰信号传播的多普勒效应以及扰动信号激发源的移动特性.
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| 关 键 词： | 重力 地震仪 扰动 强对流 台风 |
| 收稿时间： | 2013-03-21 |
Gravity disturbances of Tai’an seismic station |
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| Institution: | Earthquake Administration of Shandong Province, Ji’nan 250014, China |
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| Abstract: | This paper analyzed the tidal gravity data of Tai’an seismic station by using filtering method. The result showed that high frequency disturbances can be frequently observed on the background of the earth tide by the gravimeter. Compared with the records of meteorological observation, it was indicated that these disturbances were not only affected by the tropical cyclone such as typhoons, but also had relations with the strong regional convection weather such as cold wave transit. The further analyses on the data recorded at JCZ-1 ultra broad-band seismometer, by using frequency spectrum and filtering method, showed that the strong regional convection and typhoon have influence on gravimeter in the range of 1—8 s, and more obvious within 2—6 s. The distur-bance signal triggered by the strong convection weather process can be in the range of 1—16 s, but the gravimeter observation is almost not affected beyond 8 s, namely, there is a stopage period of gravimeter’s responding to the high frequency disturbance. The filtering result from the data recorded by JCZ-1 ultra broad-band seismometer also presented a dynamic characteristic of the disturbances, that is to say, during the developing and transmitting process of disturbances resulted from strong convection weather, high frequency signals firstly appeared, then gradually turned to the low-frequency ones with time, indicating the Doppler effect of the disturbance signal propagation, and the moving characteristics of inspiring source of the disturbance signals. |
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