79seismo/disperpicker

Automatically extracting dispersion curves via deep learning

DisperPicker

by Shaobo Yang, University of Science and Technology of China, 2020

E-mail: [email protected]

This tool mainly targets at automatically extracting dispersion curves via deep learning for the image transformation technique (EGFAnalysisTimeFreq, https://github.com/ShaoboYang-USTC/EGFAnalysisTimeFreq) and the associated software developed by Huajian Yao, which is widely used in the community for dense array ambient noise analysis.

References: Yang, S., Zhang, H., Gu, N., Gao, J., Xu, J., Jin, J., Li, J., and Yao H. (2022). Automatically Extracting Surface Wave Group and Phase Velocity Dispersion Curves from Dispersion Spectrograms Using a Convolutional Neural Network. Seismological Research Letters, doi: https://doi.org/10.1785/0220210280.

1. Installation

• Platform: Linux
• Download repository
• Install Python 3.6
• Install dependencies: pip install -i https://pypi.tuna.tsinghua.edu.cn/simple -r requirements.txt

2. Applications

• Put the test data into ./data/TestData. When saving the dispersion spectrograms, the velocity step (dv) must be 0.005 km/s and the recommended period step (dT) is 0.1 s. The dispersion spectrograms can be derived from EGFs or CFs using EGFAnalysisTimeFreq.

• Check the parameters in the configuration file: ./config/config.py

• Write the station location information in ./config/station.txt

• Run the detection program: python pick_v.py

3. Picking results

• The picking results are saved in ./result/pick_result and some figures are saved in ./result/plot1 and ./result/plot2

4. Quality Control

• Run ./result/process/process_C.py for QC of the phase velocity dispersion curves and ./result/process/process_G.py for group velocity.
• The dispersion curves after QC is saved in ./result/process/new/ and all of the dispersion curves are shown in DPN_C.jpg and DPN_G.jpg.
• Run ./result/process/plot_res.py to plot each dispersion spectrogram and the corresponding DisperPicker picked dispersion curves. The figures are save in ./result/process/new/plot/.