IPP: A Seismic P-Wave’s Detection Method Based on the Initial Power of the P-Wave

ABSTRACT

The detection of P-wave is essential for the earthquake early warning system. How to detect the P-wave under noise circumstance accurately and rapidly is a challenge work. Based on the relative power of the seismic signal, a new parameter, the initial power of the P-wave (IPP), is proposed to detect the P-wave. By using the relative power of the seismic signal, the interference of the background noise is eliminated, and the initial power of the P-wave and sigma criterion are both applied to detect the P-wave. Through simulation analysis and example tests whose magnitudes are varied from Ms4.0 to Ms8.0, both the misjudgment and the missing rate of the IPP method are 0, and the time deviation within 0.2 s can reach 78.95%. Comparing with the STA/LTA, STP/LTP and PhaseNet methods, the IPP method proposed in this paper has strong robustness and high accuracy, which represents the initial power characteristic of P-wave and can effectively eliminate the interference of background noise.

KEYWORDS:

• Earthquake early warning
• P waves’ detection
• Relative power
• Initial power of the P-wave
• Sigma criterion

Acknowledgement

Thanks are due to Dr. Zhu for his PhaseNet code and help.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This research was supported by the National Nature Science Foundation of China [No. 41874019]. The data for this study were provided by the National Key Research and Development Program of China [No. 2019YFC1509205], Institute of Engineering Mechanics, China Earthquake Admin-istration and China Earthquake Networks Center, National Earthquake Data Center (http://data.earthquake.cn).