Customization of a deep neural network using local data for seismic phase picking

Yoontaek Hong, Ah Hyun Byun, Seongryong Kim, Dong Hoon Sheen

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Deep-learning (DL) pickers have demonstrated superior performance in seismic phase picking compared to traditional pickers. DL pickers are extremely effective in processing large amounts of seismic data. Nevertheless, they encounter challenges when handling seismograms from different tectonic environments or source types, and even a slight change in the input waveform can considerably affect their consistency. Here, we fine-tuned a self-trained deep neural network picker using a small amount of local seismic data (26,875 three-component seismograms) recorded by regional seismic networks in South Korea. The self-trained model was developed using publicly available waveform datasets, comprising over two million three-component seismograms. The results revealed that the Korean-fine-tuned phase picker (KFpicker) effectively enhanced picking quality, even when applied to data that were not used during the fine-tuning process. When compared to the performance of the pre-trained model, this improvement was consistently observed regardless of variations in the positions of seismic phases in the input waveform, Furthermore, when the KFpicker predicted the phases for overlapping input windows and used the median value of probabilities as a threshold for phase detection, a considerable decrease was observed in the number of false picks. These findings indicate that fine-tuning a deep neural network using a small amount of local data can improve earthquake detection in the region of interest, while careful data augmentation can enhance the robustness of DL pickers against variations in the input window. The application of KFpicker to the 2016 Gyeongju earthquake sequence yielded approximately twice as many earthquakes compared to previous studies. Consequently, detailed and instantaneous statistical parameters of seismicity can be evaluated, making it possible to assess seismic hazard during an earthquake sequence.

    Original languageEnglish
    Article number1306488
    JournalFrontiers in Earth Science
    Volume11
    DOIs
    Publication statusPublished - 2023

    Bibliographical note

    Publisher Copyright:
    Copyright © 2023 Hong, Byun, Kim and Sheen.

    Keywords

    • 2016 Gyeongju earthquake sequence
    • deep learning
    • fine tuning
    • seismic hazard assessment
    • seismic phase picking

    ASJC Scopus subject areas

    • General Earth and Planetary Sciences

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