一种低频地震事件的检测方法在汶川地震和芦山地震前的初步应用

Abstract

Abstract: An algorithm for detection of lowfrequency seismic event is developed and applied to detect lowfrequency event before the 2008 Wenchuan and the 2013 Lushan earthquakes. Continuous verticalcomponent waveforms of some broad band stations in a few months surrounding the Wenchuan earthquake and Lushan earthquake have been processed by applying a bandpass filter in 2—8 Hz, converted to envelopes with a smoothing time of 10 s window and a median filter with a 20 min window. As a result, teleseismic, longperiod noise and local small earthquakes are removed, the filtered amplitude is obviously larger than that of noise and last for a dozen of minutes to several hours during a few days for a small number of stations before the Wenchuan earthquake and Lushan earthquake, respectively. The waveform and envelope are similar to that of nonvolcanic tremor (NVT), we think they are suspected NVT before the two earthquakes. Preliminary application demonstrates that this algorithm is potentially useful for extracting NVT signal from continuous seismic waveforms.

Key words: Slow earthquake, Seismic waveform, Envelope, Wenchuan earthquake, Lushan earthquake

CLC Number:

P315.7

LIANG Jian-hong, LIU Jie, YANG Wen, DENG Fei. An Algorithm for Detecting Low-frequency Seismic Event and Preliminary Applications[J]. EARTHQUAKE, 2015, 35(1): 1-10.

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An Algorithm for Detecting Low-frequency Seismic Event and Preliminary Applications

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