强地震前后重力观测中异常变化现象的研究

Abstract

Abstract: In order to explore the anomaly variation before and after the great Kunlun Mountain M_S8.1 earthquake on November 14, 2001 and Sumatra M_W9.0 earthquake on December 26, 2004, the minutely sampled data are analyzed, which covered before and after the earthquakes. Butterworth high pass filtered results and spectrograms show that there are anomaly changes at stations of Urumqi and Korla at two time spans before the Kunlun Mountain M_S8.1 earthquake, which appeared from November 3 to 5 and from November 11 to 13, respectively. Both anomalies are expressed as vibration signal with low frequency, and intensity of the latter is stronger. But no vibration like these appeared at the other stations. The same signals are recorded at stations of Korla and Urumqi before Sumatra M_W9.0 earthquake. At the same time, the recording curve of superconducting gravimeter in Wuhan became thicken beginning from the afternoon of December 15, 2004.

Key words: Gravity observation, High-pass filter, Spectrogram, Vibration signal, Slow earthquake

CLC Number:

P315.7

WANG Wu-Xing, MA Li, HUANG Jian-ping. Analysis of anomaly in gravity observation before and after strong earthquakes[J]. EARTHQUAKE, 2007, 27(2): 53-63.

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Analysis of anomaly in gravity observation before and after strong earthquakes

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