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DOI	10.1016/j.epsl.2021.116819
	Earthquake collapse mechanisms and periodic, migrating seismicity during the 2018 summit collapse at Kīlauea caldera
	Alvizuri C.R.; Matoza R.S.; Okubo P.G.
发表日期	2021
ISSN	0012821X
卷号	562
英文摘要	The 2018 Lower East Rift Zone eruption of Kīlauea volcano was accompanied by a remarkable and periodic succession of collapses in the summit region. Between May-August the eruption and collapse sequence included 54 earthquakes (M∼5; M5s) observed worldwide, and over 45,000 intervening earthquakes (M≥0). We estimated seismic full moment tensors for the M5s and analyzed the spatiotemporal evolution of the intervening seismicity. The hypocenters were concentrated between 0-3 km depths and reveal arcuate bands that migrated outward by ∼300 m (map view) and downward by ∼200 m. The temporal evolution reveals almost daily successions of escalating earthquake swarms, followed by an M5, followed by a quiescent period. The moment tensors reveal consistent collapse mechanisms with vertical P-axis orientations. Poisson's ratios estimated from the moment tensors were variable at first (ν=0.1−0.3) and from June 26 onward converged to ν∼0.28, similar to loading cycles observed in lab experiments. The shallower collapses approximately follow the expanding contour of the crater, while deeper collapses aggregate first to the north of the previous crater and later to the east and south. We interpret that the magma storage complex beneath the summit region comprises a distributed plexus of cracks that progressively evacuated and underwent collapse as magma drained from the summit region to feed the eruption. © 2021 Elsevier B.V.
关键词	caldera collapse isotropic Kilauea volcano non-double-couple seismic moment tensors seismicity
英文关键词	Tensors; Axis orientation; Collapse mechanism; Earthquake swarms; Loading cycles; Quiescent period; Rift-zone eruptions; Spatiotemporal evolution; Temporal evolution; Earthquakes; caldera; collapse structure; earthquake hypocenter; earthquake mechanism; moment tensor; periodicity; seismic moment; seismicity; volcanic earthquake; volcanic eruption; Hawaii [(ISL) Hawaiian Islands]; Hawaii [United States]; Hawaiian Islands; Kilauea
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203018
作者单位	Institute of Earth Sciences, University of Lausanne, Switzerland; Department of Earth Science, Earth Research Institute, University of California, Santa Barbara, United States; Department of Earth Sciences, University of Hawai'i at Manoa, Honolulu, Hawai'i, United States
推荐引用方式 GB/T 7714	Alvizuri C.R.,Matoza R.S.,Okubo P.G.. Earthquake collapse mechanisms and periodic, migrating seismicity during the 2018 summit collapse at Kīlauea caldera[J],2021,562.
APA	Alvizuri C.R.,Matoza R.S.,&Okubo P.G..(2021).Earthquake collapse mechanisms and periodic, migrating seismicity during the 2018 summit collapse at Kīlauea caldera.Earth and Planetary Science Letters,562.
MLA	Alvizuri C.R.,et al."Earthquake collapse mechanisms and periodic, migrating seismicity during the 2018 summit collapse at Kīlauea caldera".Earth and Planetary Science Letters 562(2021).