The anomalous reactions of the geomagnetic horizontal field transfer functions before Tangshan earthquake

We have collected the data of variometers in period from 1972 through 1984 at Changli and Baijiatuan stations. The results calculated from 19 groups of data show: 1) There are no significant anomalies of A, B at Baijiatuan and that of B at Changli, but there are evident anomalous changes for A sub(u...

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Bibliographic Details
Published in:Acta seismologica sinica 1997-01, Vol.10 (1), p.61-70
Main Authors: Gong, Shao-Jing, Chen, Hua-Ran, Zhang, Cui-Fen, Yang, Cheng-Jun, Ma, Shu-Qin
Format: Article
Language:chi ; eng
Subjects:
Anomalies
Earthquakes
Geomagnetism
Geophysics
Mathematical analysis
Neighbouring
Plate tectonics
Seismic activity
Seismic phenomena
Seismology
Stations
Transfer functions
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Summary:We have collected the data of variometers in period from 1972 through 1984 at Changli and Baijiatuan stations. The results calculated from 19 groups of data show: 1) There are no significant anomalies of A, B at Baijiatuan and that of B at Changli, but there are evident anomalous changes for A sub(u), A sub(v) at Changli station. This result basically agrees to the a, b calculated using the method of measuring magnetograms, which demonstrates that the anomalies limited in the aftershock area and its neighbouring regions. 2) There are some changes of the interstation transfer functions of C sub(u), C sub(v), F sub(u), F sub(v) before Tangshan earthquake, and the changes of the image parts C sub(v), F sub(v) are more obvious, which is in agreement with the research results for Hualian earthquake. However, according to the results of Carlisle M=5.0 earthquake by Beamish (1982), the real parts F sub(u), C sub(u) change more significantly.
ISSN:1000-9116
1674-4519
1993-1344
1867-8777
DOI:10.1007/s11589-997-0040-0