Proper classification of nontectonic seismic signals is critical for detecting microearthquakes and developing an improved understanding of ongoing weak ground motions. We use unsupervised machine learning to label five classes of nonstationary seismic noise common in continuous waveforms. Temporal and spectral features describing the data are clustered to identify separable types of emergent and impulsive waveforms. The trained clustering model is used to classify every 1 s of continuous seismic records from a dense seismic array with 10–30 m station spacing. We show that dominate noise signals can be highly localized and vary on length scales of hundreds of meters. The methodology demonstrates the complexity of weak ground motions and improves the standard of analyzing seismic waveforms with a low signal‐to‐noise ratio. Application of this technique will improve the ability to detect genuine microseismic events in noisy environments where seismic sensors record earthquake‐like signals originating from nontectonic sources.
Johnson, Christopher W., et al. "Identifying Different Classes of Seismic Noise Signals Using Unsupervised Learning." Geophysical Research Letters, vol. 47, no. 15, Aug. 2020. https://doi.org/10.1029/2020GL088353
Johnson, Christopher W., Ben‐Zion, Yehuda, Meng, Haoran, & Vernon, Frank (2020). Identifying Different Classes of Seismic Noise Signals Using Unsupervised Learning. Geophysical Research Letters, 47(15). https://doi.org/10.1029/2020GL088353
Johnson, Christopher W., Ben‐Zion, Yehuda, Meng, Haoran, et al., "Identifying Different Classes of Seismic Noise Signals Using Unsupervised Learning," Geophysical Research Letters 47, no. 15 (2020), https://doi.org/10.1029/2020GL088353
@article{osti_1644360,
author = {Johnson, Christopher W. and Ben‐Zion, Yehuda and Meng, Haoran and Vernon, Frank},
title = {Identifying Different Classes of Seismic Noise Signals Using Unsupervised Learning},
annote = {Abstract Proper classification of nontectonic seismic signals is critical for detecting microearthquakes and developing an improved understanding of ongoing weak ground motions. We use unsupervised machine learning to label five classes of nonstationary seismic noise common in continuous waveforms. Temporal and spectral features describing the data are clustered to identify separable types of emergent and impulsive waveforms. The trained clustering model is used to classify every 1 s of continuous seismic records from a dense seismic array with 10–30 m station spacing. We show that dominate noise signals can be highly localized and vary on length scales of hundreds of meters. The methodology demonstrates the complexity of weak ground motions and improves the standard of analyzing seismic waveforms with a low signal‐to‐noise ratio. Application of this technique will improve the ability to detect genuine microseismic events in noisy environments where seismic sensors record earthquake‐like signals originating from nontectonic sources.},
doi = {10.1029/2020GL088353},
url = {https://www.osti.gov/biblio/1644360},
journal = {Geophysical Research Letters},
issn = {ISSN 0094-8276},
number = {15},
volume = {47},
place = {United States},
publisher = {American Geophysical Union (AGU)},
year = {2020},
month = {08}}