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[1]LI Hang,CHEN Xiaodong,XU Jianqiao,et al.Study with Observations on Responses of gPhone Gravimeters at Surface Wave Frequency Band[J].Journal of Seismological Research,2021,44(01):33-40.

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Study with Observations on Responses of gPhone Gravimeters at Surface Wave Frequency Band

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 44 Number of periods: 2021 01 Page number: 33-40 Column: Public date: 2021-01-15

Title:: Study with Observations on Responses of gPhone Gravimeters at Surface Wave Frequency Band

Author(s):: LI Hang¹; CHEN Xiaodong¹; 2; XU Jianqiao¹; SUN Heping¹; 2; HAN Yufei³; (1.State Key Laboratory of Geodesy and Earth’s Dynamics,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430077,Hubei,China)(2.University of Chinese Academy of Sciences,Beijing 100049,China)(3.China Earthquake Networks Center,Beijing 100045,China)

Keywords:: high frequency responses; gPhone gravimeters; STS-1 seismometers; surface waves; instrumental phase corrections

CLC:: P315.63

DOI:: -

Abstract:: Based on the continuous gravity tides data recorded by the gPhone relative gravimeters at Kunming and Enshi stations in the Crustal Movement Observation Network of China(CMONOC),we analyzed high frequency responses above 1 mHz of gPhone gravimeters.Different from previous studies,we obtained high frequency responses of gPhone gravimeters from the view of Rayleigh wave,and by comparing with the results of the LHZ component data of the STS-1 seismometer observed at the same site at the Kunming and Enshi stations,we also tested the reliability of the high frequency results of gPhone gravimeters.Through comparing surface waveforms and dispersion curves extracted by the two different instruments,we find that the amplitudes and phases of surface waves are consistent observed by the two different instruments at Kunming station,and the amplitudes of surface waves are consistent,but the phases of surface waves are different at the Enshi station.There are different time delays in different frequency bands for surface waves recorded by the gPhone gravimeter at the Enshi station.Moreover,the results of the Earth’s free oscillations excited by a large earthquake recorded by the two different instruments show that the frequencies and amplitudes of the fundamental frequency spherical free oscillation are in good agreement,which further proves the reliability of the high frequency amplitude responses of gPhone gravimeters.The results in this study reveals that the amplitudes of high frequency signals,such as surface waves and free oscillations excited by large earthquakes,can be accurately recorded by gPhone gravimeters.However,when recording the phase information of signals,some gPhone gravimeters may cause phase delay.If the phases of signals need to be considered,we should obtained the phase delay caused by the gPhone gravimeter,then corrected the time delay(phase delay)of the recorded signals.

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Last Update: 2021-01-15