[1]ZENG Xian-wei,ZHAO Wei-ming,LI Hong-ting,et al.Discrimination between Earthquakes and Explosions in Ningxia and Its Neighboring Region Using Time-frequency Spectrum Wavelet Packet Transform[J].Journal of Seismological Research,2010,33(03):300-307.
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Discrimination between Earthquakes and Explosions in Ningxia and Its Neighboring Region Using Time-frequency Spectrum Wavelet Packet Transform
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
33
Number of periods:
2010 03
Page number:
300-307
Column:
Public date:
2010-03-01
- Title:
- Discrimination between Earthquakes and Explosions in Ningxia and Its Neighboring Region Using Time-frequency Spectrum Wavelet Packet Transform
- Keywords:
- wavelet packet transform; time-frequency spectrum; earthquakes; explosions; identification; Ningxia and the neighboring region
- CLC:
- P315.63
- DOI:
- -
- Abstract:
- Using dmey wavelet-base function,we conduct a wavelet-packet transform of the signals of vertical component recordings of the earthquakes and the explosions to calculate the values of the normalized time-frequency spectrum of the signal of each earthquake and explosion,and to calculate the frequency fmp on condition that the value of time-frequency spectrum of P wave is maximum.We also calculate the frequency fms on condition that the value of time-frequency spectrum of S wave is maximum.Then we compare the maximum value of instantaneous spectrum of the seismic signals with that of the blasting signals in the same decomposition frequency band of P wave within frequency 0-6.25 Hz.And we compare the maximum value of instantaneous spectrum of the seismic signals with that of the blasting signals in the same decomposition frequency band of S wave within frequency 0-6.25 Hz.Thus we get some quantitative indexes to identify the earthquake and the explosion. Combining all these indexes we get a synthetic criterion.Then we apply the single index and the synthetic criterion to the identification test of 14 quakes and 19 explosions recorded by Yinchuan Seismic Station.We find that using the single index,80% of the quakes and the explosions can be identified,and 100% of the quakes and the explosions can be identified using the synthetic criterion.
- References:
- -
- Similar References:
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Last Update:
2010-03-23