无监督聚类揭示阿拉斯加Great Sitkin火山喷发前地震活动演化

戴梦雪; 祝可欣; 裴军令; 赵斐宇; 徐荣荣

doi:10.3799/dqkx.2025.105

Volume 51 Issue 1

Jan. 2026

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Article Navigation > Earth Science > 2026 > 51(1): 146-159

Dai Mengxue, Zhu Kexin, Pei Junling, Zhao Feiyu, Xu Rongrong, 2026. Unsupervised Clustering Reveals Pre-Eruptive Seismicity Evolution at Great Sitkin Volcano, Alaska. Earth Science, 51(1): 146-159. doi: 10.3799/dqkx.2025.105

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Dai Mengxue, Zhu Kexin, Pei Junling, Zhao Feiyu, Xu Rongrong, 2026. Unsupervised Clustering Reveals Pre-Eruptive Seismicity Evolution at Great Sitkin Volcano, Alaska. Earth Science, 51(1): 146-159. doi: 10.3799/dqkx.2025.105

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Unsupervised Clustering Reveals Pre-Eruptive Seismicity Evolution at Great Sitkin Volcano, Alaska

doi: 10.3799/dqkx.2025.105

Dai Mengxue^{1, 2
,
,},
Zhu Kexin¹,
Pei Junling^{1
,
,},
Zhao Feiyu¹,
Xu Rongrong¹

1.
National Key Laboratory of Uranium Resources Exploration-Mining and Nuclear Remote Sensing, East China University of Technology, Nanchang 330013, China
2.
SinoProbe Laboratory, Ministry of Natural Resources, Chinese Academy of Geological Sciences, Beijing 100094, China

Received Date: 2025-04-30
Publish Date: 2026-01-25

Abstract

Abstract

The spatiotemporal characteristics of volcanic seismicity provide critical constraints for deciphering magma migration processes and eruption precursors. To elucidate the magmatic activity mechanisms preceding the 2021 eruption of the Great Sitkin Volcano, Alaska, this study conducted a systematic analysis of the pre-eruptive continuous seismic waveform data from the volcano. Template matching and the double-difference relocation method were employed to detect seismic events and achieve high-precision relocation. An unsupervised hierarchical clustering algorithm was then applied to classify volcanic seismicity and analyze its spatiotemporal evolution based on the constructed seismic catalog. The resulted seismic catalog contains four times the number of events compared to the official Alaska Volcano Observatory (AVO) catalog. Hierarchical clustering successfully categorized the seismic events into long-period (LP) earthquakes and volcano-tectonic (VT) earthquakes. The results show that a significant intensification of volcano seismic activity was observed prior to the eruption, with shallow LP events reaching an activity peak 24 hours before the eruption, and it is possible that the phenomenon potentially represents critical eruption precursor signals. The eruption was mainly triggered by magma accumulation and pressurization at upper-crustal depths directly beneath the summit crater.
- unsupervised learning,
- hierarchical clustering,
- seismic relocation,
- volcanic seismicity,
- eruption precursor,
- seismology

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References(45)

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