海岛地震台网自然因素对地脉动干扰分析

利用海南地震台网宽频带地震仪连续观测资料,分析不同自然环境下地脉动扰动信号,结果显示:在不同自然环境下,地震仪记录的地脉动扰动信号的形态、振幅、频率、扰动强度不同,其中登陆海岛的热带气旋引起的震颤信号频带窄、能量大、扰动强度较大,对地脉动干扰影响大,其次是天文潮期,远离海岛的热带气旋对地脉动干扰影响较小;不同路径、距离的热带气旋引起的震颤信号频率带一致,但扰动强度区别明显;不同自然环境对不同观测台站记录的地脉动信号均存在影响,只是程度稍有不同。

Interference analysis of natural factors on microseisms in island seismic network

Using the continuous observation data recorded by broadband seismometer in Hainan seismic network, the disturbance signals in different natural environment are analyzed and this article give the result as follows. Disturbance signal of microseisms recorded by broadband seismometer is different in shape, amplitude, frequency, and disturbance intensity in different natural environment. The tremor which caused by tropical cyclone landed island has a narrow frequency band, large energy and disturbance intensity, and the tropical cyclone has the greatest impact on the fluctuation of the microseisms, the second is astronomical tide. The tropical cyclones away from the island have the least impact on the microseisms. The frequency bands of the tremor signals caused by tropical cyclones with different paths and distances are consistent, but the intensity of the disturbances is distinct. The microseisms recorded by different observation stations are affected by different natural environment, but the influence on different stations is slightly different.