气候变化领域集成服务门户(CCPortal): Reconstruction of the 2018 tsunamigenic flank collapse and eruptive activity at Anak Krakatau based on eyewitness reports, seismo-acoustic and satellite observations

CCPortal

DOI	10.1016/j.epsl.2020.116268
	Reconstruction of the 2018 tsunamigenic flank collapse and eruptive activity at Anak Krakatau based on eyewitness reports, seismo-acoustic and satellite observations
	Perttu A.; Caudron C.; Assink J.D.; Metz D.; Tailpied D.; Perttu B.; Hibert C.; Nurfiani D.; Pilger C.; Muzli M.; Fee D.; Andersen O.L.; Taisne B.
发表日期	2020
ISSN	0012821X
卷号	541
英文摘要	After several months of eruptive activity, the subaerial cone of Anak Krakatau collapsed on December 22, 2018. The landslide event generated a tsunami that had deadly consequences within the Sunda Strait in Indonesia. Such significant collapse events are common in the geologic record but are a rare phenomenon, in the instrumented record. However, these events can have a potentially large impact on society. We have reconstructed the collapse, along with the activity preceding and following it, by combining information from official reports, remote geophysical observations, and local eyewitness accounts. It appears that the collapse of Anak Krakatau's subaerial cone led to a drastic change in the eruptive style from continuous Strombolian explosions to sustained Surtseyan. Those changes are detectable in the seismo-acoustic measurements, which, when combined with eyewitnesses, allows us to reconstruct the timing and phenomenology of the sequence. Our analysis reveals that intense eruptive activity generated sustained infrasound, unusual but not unique at Anak Krakatau, starting approximately eight hours before the collapse. Within this timeframe, two seismic signals consistent with minor mass movements as well as a momentary quiescence were identified prior to the main collapse. The data presented here indicate that Anak Krakatau failed in one collapse event, producing a tsunami with multiple waves around the volcano, the last one being the largest. Following the collapse, three volcanic plumes could be clearly identified in the satellite data and by eyewitnesses, as well as spectral lines in the seismic data. These lines, observed up to 371 km, suggest a repeating energetic explosive source lasting for seven days. The collapse produced multiple infrasound arrivals observed at regional infrasound stations, but was not recorded on the regional hydroacoustic network. Our analysis of the eruptive sequence demonstrates that a detailed eruption chronology can be reconstructed using remote methods, even in the event of failure or destruction of local monitoring infrastructure. This event also highlights that tsunamigenic flank collapses can occur with little to no warning, and be difficult to interpret in real-time, as a significant amount of non-operational analysis was required after the event, to complete the chronology. © 2020 The Author(s)
关键词	Anak Krakatau eyewitness infrasound remote monitoring seismic volcanic tsunami
英文关键词	Seismic waves; Tsunamis; Volcanoes; Acoustic measurements; Eruptive activity; Explosive source; Geophysical observations; Local monitoring; Operational analysis; Satellite observations; Seismic signals; Seismology; chronology; collapse; geological record; infrasonics; real time; reconstruction; satellite imagery; tsunami; volcanic eruption; Anak Krakatau; Krakatau; Lampung
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/202831
作者单位	Earth Observatory of Singapore, Nanyang Technological University, 50 Nanyang Avenue, Block N2-01a-15639798, Singapore; Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, 38000, France; Royal Netherlands Meteorological Institute (KNMI), R&D Seismology and Acoustics, PO Box 201, De Bilt, 3730 AE, Netherlands; Japan Agency for Marine-Earth Science and Technology, 2-15, Natsushima-cho, Yokosuka-city, Kanagawa 237-0061, Japan; Asian School of the Environment, Nanyang Technological University, 50 Nanyang Avenue, Block N2-01C-63639798, Singapore; School and Observatory of Earth Sciences, University of Strasbourg, CNRS, 5 René Descartes Street, Strasbourg cedex, F-67084, France; Federal Institute for Geosciences and Natural Resources (BGR), Stilleweg 2, Hanover, 30655, Germany; Agency for Meteorology, Climatology and Geophysics (BMKG), Jl. Angkasa I No. 2 Kemayoran, Jakarta Pusat, DKI, P.O. Box 3540 Jkt., Jakarta, 10720, Indonesia; Alaska Volcano Observatory, Geophysical Instit...
推荐引用方式 GB/T 7714	Perttu A.,Caudron C.,Assink J.D.,et al. Reconstruction of the 2018 tsunamigenic flank collapse and eruptive activity at Anak Krakatau based on eyewitness reports, seismo-acoustic and satellite observations[J],2020,541.
APA	Perttu A..,Caudron C..,Assink J.D..,Metz D..,Tailpied D..,...&Taisne B..(2020).Reconstruction of the 2018 tsunamigenic flank collapse and eruptive activity at Anak Krakatau based on eyewitness reports, seismo-acoustic and satellite observations.Earth and Planetary Science Letters,541.
MLA	Perttu A.,et al."Reconstruction of the 2018 tsunamigenic flank collapse and eruptive activity at Anak Krakatau based on eyewitness reports, seismo-acoustic and satellite observations".Earth and Planetary Science Letters 541(2020).