Mathematics – Logic
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993acssn...6.1031z&link_type=abstract
Acta Seismologica Sinica, Volume 6, Issue 4, pp.1031-1039
Mathematics
Logic
Quarlz Horizontal Pendulum, Eddy-Current Transducer, Digital Tape Recorder, Bulging Plate, Earth Tides
Scientific paper
The SSQ-1 Digital Tape Recording Horizontal Pendulum Tiltmeter is an instrument of high sensitivity to detect the changes of ground tilt. It uses a quartz horizontal pendulum held by Zöllner bifilar suspension to sense vertical displacement, the eddy-current transducer on the pendulum converts its displacements into electric signals. Then a microcomputer is used for data acquisition and printing as well as digit tape recording. And at the same time, a filtering pen recorder is used for visible recording. The scale value of the instrument is calibrated by computer using the known tilt angle of the bulging plate — mercury cup. The scale value is 0.3 0.5 m(″)/mV. The following are the testing results for the earth tide observation obtained from the east-west component at Baijiatan Seismic Station, Beijing: r(O1): 0.6490±0.0179 α(O1): -3.83°±1.58° r(K1): 0.8049±0.0128 α(K1): 1.40°±0.90° r(M2): 0.6699±0.0040 α(M2): -0.27°±0.34° r(S2): 0.7316±0.0075 α(S2): 2.83°±0.58° r(M3): 0.8497±0.0964 α(M3): 1.61°±6.51°
Feng Hai-Ying
Gao Fa-Cheng
Ouyang Biao
Tang Zhong-Guo
Zhu Hu
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