Joint observation of long period tremor signals with broadband seismometer,tiltmeter and gravimeter |
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| Authors: | Yan-bin Zhang Jun Jiang Ying-chun Liao Sheng-le Li and Tie-tao Zhong |
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| Institution: | (1) Huazhong University of Science and Technology, Wuhan, 430074, China;(2) Institute of Seismology, China Earthquake Administration, Wuhan, 430071, China |
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| Abstract: | We report here the observation result of joint observation of long period tremor signals with broadband seismometer, tiltmeter
and gravimeter at the HUST (Huazhong University of Science and Technology) station. The observed data were compared and analyzed.
Since 2005, the several tens of abnormal tremor signals which are weak, complex and duration of 2 to 3 days have been synchronously
recorded by the different instruments. The tremor signals have the periodic domain in the range of 3 to 5 minutes, 20 to 30
minutes and even more than 1 hour. The observation shows such tremors are a physical existence. The analysis indicates that
a part of the tremors caused by the typhoon from the western Pacific Ocean. These tremors have a close relationship with wind
velocity of typhoon and distance between the typhoon center and the station. Except these, the cause of others is still unclear.
Foundation item: “985” Plan from Ministry of Education. |
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| Keywords: | broadband seismometer gravimeter tiltmeter long period signal tremor typhoon |
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