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README_iter2.md

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-# PhaseNet-TF Alaska - iter2
-
-## Model Description
-
-PhaseNet-TF is an advanced deep learning model for automatic seismic phase picking (P-wave, S-wave, and PS-wave detection) using spectrogram-based image segmentation approaches. The model leverages DeepLabV3Plus architecture to detect seismic arrivals with high accuracy, especially for weak and noisy signals from ocean-bottom seismometers and weak phases such as slab interface refracted PS and SP waves. This Alaska version is specifically trained on the PS_Alaska dataset for P and S phases. For more details, please refer to the paper and the [PhaseNet-TF](https://github.com/swei-seismo/PhaseNet-TF) repository.
-
-## Model Architecture
-
-- **Backbone**: DeepLabV3Plus with ResNet34 encoder
-- **Input**: 3-component seismic waveforms converted to 6-channel spectrograms (real + imaginary)
-- **Output**: Probability maps for P, S, PS phases and noise
-- **Sampling Rate**: 40 Hz (dt_s = 0.025s)
-- **Window Length**: 4800 points (120 seconds)
-- **Spectrogram Size**: 64 × 4800 (frequency × time)
-- **Input Channels**: 6 (3 real + 3 imaginary spectrogram channels)
-- **Output Classes**: 4 (noise, P, S, PS)
-
-## Citation
-
-If you use this model in your research, please cite:
-
-```bibtex
-@article{jie2025background,
-  title={Background Seismicity and Aftershocks of the 2020-2021 Large Earthquakes at the Alaska Peninsula Revealed by a Deep-learning-based Catalog},
-  author={Jie, Yaqi and Wei, Songqiao Shawn and Zhu, Weiqiang and Freymueller, Jeffrey Todd and Elliott, Julie},
-  journal={Authorea Preprints},
-  year={2025},
-  publisher={Authorea}
-}
-```
-
-## License
-
-This model is licensed under the MIT License.