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

Autor: Cui-Fen Zhang, Shu-Qin Ma, Hua-Ran Chen, Cheng-Jun Yang, Shao-Jing Gong
Rok vydání: 1997
Předmět:
Zdroj: Acta Seismologica Sinica. 10:61-70
ISSN: 1993-1344
1000-9116
DOI: 10.1007/s11589-997-0040-0
Popis: 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 u, Av 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 u, Cv, Fu, Fv before Tangshan earthquake, and the changes of the image parts C v, Fv 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 u, Cu change more significantly.
Databáze: OpenAIRE
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