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Shallow degassing events as a trigger for very-long-period seismicity at Kīlauea Volcano, Hawai‘i

Authors
  • Patrick, Matthew1
  • Wilson, David1
  • Fee, David2
  • Orr, Tim1
  • Swanson, Don1
  • 1 Hawaiian Volcano Observatory—US Geological Survey, Hawai‘i National Park, HI, 96718, USA , Hawai‘i National Park (United States)
  • 2 University of Hawai‘i at Mānoa, Infrasound Laboratory, 73–4460 Queen Kaahumanu Hwy #119, Kailua-Kona, HI, 96740, USA , Kailua-Kona (United States)
Type
Published Article
Journal
Bulletin of Volcanology
Publisher
Springer-Verlag
Publication Date
May 12, 2011
Volume
73
Issue
9
Pages
1179–1186
Identifiers
DOI: 10.1007/s00445-011-0475-y
Source
Springer Nature
Keywords
License
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Abstract

The first eruptive activity at Kīlauea Volcano’s summit in 25 years began in March 2008 with the opening of a 35-m-wide vent in Halema‘uma‘u crater. The new activity has produced prominent very-long-period (VLP) signals corresponding with two new behaviors: episodic tremor bursts and small explosive events, both of which represent degassing events from the top of the lava column. Previous work has shown that VLP seismicity has long been present at Kīlauea’s summit, and is sourced approximately 1 km below Halema‘uma‘u. By integrating video observations, infrasound and seismic data, we show that the onset of the large VLP signals occurs within several seconds of the onset of the degassing events. This timing indicates that the VLP is caused by forces—sourced at or very near the lava free surface due to degassing—transmitted down the magma column and coupling to the surrounding rock at 1 km depth.

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