PPHASEPICKER is a powerful tool for automatically picking P-phase onsets with high precision without requiring detection interval or threshold settings. The algorithm detects P-phase onset in single-component acceleration or broadband velocity records using the histogram method. It also computes signal-to-noise ratio (SNR).
PPHASEPICKER has been integrated into the “Automated Processing and Review Interface for Strong Motion Data (PRISM)” software (https://earthquake.usgs.gov/research/software/prism/) of the U.S. Geological Survey in order to identify pre-event time-window for systematic and automated processing of large numbers of strong-motion data.
An example MatLAB code is provided in zip file to show how to run PPHASEPICKER using three sample waveforms, one from strong earthquake and others from micro seismic events.
For your intended application, please note that filter corner frequencies may need to be updated manually within the code based on the frequency content of the input record.
Kalkan, E. (2016). “An Automatic P-phase Arrival Time Picker“, Bull. of Seis. Soc. of Am., 106(3): 971-986, doi: 10.1785/0120150111.
Dr. Erol Kalkan, P.E. (2021). An automated P-phase Arrival Time Picker with SNR output (https://www.mathworks.com/matlabcentral/fileexchange/57729-an-automated-p-phase-arrival-time-picker-with-snr-output), MATLAB Central File Exchange. Retrieved .
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