气候变化领域集成服务门户(CCPortal): Spatiotemporal Relationships between Two Closely-spaced Strombolian-style Vents; Yasur; Vanuatu

CCPortal

DOI	10.1029/2019GL085687
	Spatiotemporal Relationships between Two Closely-spaced Strombolian-style Vents; Yasur; Vanuatu
	Simons B.C.; Jolly A.D.; Eccles J.D.; Cronin S.J.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:5
英文摘要	This study details a case of transition of volcanic activity between two closely spaced (20–40 m) vents within the southern crater of Yasur Volcano, Vanuatu, over a period of 12 days. The transition from one vent to another newly emerged one was captured by a multi-instrument array, with broadband seismic, thermal-IR camera, and visual recordings presented. The results describe systematic changes in explosive parameters (e.g., style, power, and frequency) at both vents that reflect the transfer of magma and volatile gas flux within a shallow branching conduit system. The decline of activity at the initial vent corresponds with a shift from bomb-rich to ash-rich behavior indicating a progressive decrease in magma and volatile gas flux and increasing shallow conduit magma viscosity. The concurrent increase in activity at the emerging vent accompanies more bomb-rich behavior that indicates increased flux and lower magma viscosity. During the transition period, most explosions were systematically paired between the two vents, occurring within <1 to up to 45 s of each other. Broadband seismic data show that paired explosions produce a common seismic signal that resembles that of a single, nonpaired explosion. The presence of a common low-frequency (0.06–1 Hz) signal indicates that multiple shallow conduits may transmit the same gas and impulsive energy differently from a single gas rise and burst event. Temporal offsets between paired explosions reflect the different conduit pathways and viscosity states of the magma in each conduit, with the lagging vent always displaying greater ash-rich activity indicating higher magma viscosity and gas path tortuosity. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Bombs (ordnance); Explosions; Seismic waves; Seismology; Viscosity; Volcanoes; Eruption; Explosive parameters; Spatio-temporal relationships; Strombolian; Systematic changes; Vanuatu; Volcanic activities; Yasur; Gases; crater; energy; explosive volcanism; magma; seismic data; signal processing; spatiotemporal analysis; viscosity; volcanic eruption; Tanna; Vanuatu; Yasur Volcano
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170636
作者单位	School of Environment, University of Auckland, Auckland, New Zealand; GNS Science, Lower Hutt, New Zealand
推荐引用方式 GB/T 7714	Simons B.C.,Jolly A.D.,Eccles J.D.,et al. Spatiotemporal Relationships between Two Closely-spaced Strombolian-style Vents; Yasur; Vanuatu[J],2020,47(5).
APA	Simons B.C.,Jolly A.D.,Eccles J.D.,&Cronin S.J..(2020).Spatiotemporal Relationships between Two Closely-spaced Strombolian-style Vents; Yasur; Vanuatu.Geophysical Research Letters,47(5).
MLA	Simons B.C.,et al."Spatiotemporal Relationships between Two Closely-spaced Strombolian-style Vents; Yasur; Vanuatu".Geophysical Research Letters 47.5(2020).