Episodic deflation-inflation events at Kīlauea Volcano and implications for the shallow magma system: Chapter 11

Geophysical Monograph - 11
By: , and 
Edited by: Rebecca CareyValérie CayolMichael P. Poland, and Dominique Weis

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Abstract

Episodic variations in magma pressures and flow rates at Kīlauea Volcano, defined by a characteristic temporal evolution and termed deflation-inflation (DI) events, have been observed since at least the 1990s. DI events consist of transient, days-long deflations and subsequent reinflations of the summit region, accompanied since 2008 by fluctuations in the surface height of Kīlauea's summit lava lake. After a delay of minutes to hours, these events also often appear along the volcano's East Rift Zone in ground deformation data and as temporary reductions in eruption rate (sometimes followed by brief surges). Notable pauses in DI activity have preceded many eruptive events at Kīlauea. We analyzed more than 500 DI events recorded by borehole tiltmeters at the summit during 2000–2013. Inverse modeling suggests that DI-related ground deformation at the summit is generated by pressure transients in a shallow magma reservoir located beneath the east margin of Halema‘uma‘u Crater and that this reservoir has remained remarkably stable for more than a decade. Utilizing tilt data and variation in the level of the summit lava lake during a large DI event, we estimate a reservoir volume of approximately 1 km3 (0.2–5.5 km3 at 95% confidence).

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Additional publication details

Publication type Book chapter
Publication Subtype Book Chapter
Title Episodic deflation-inflation events at Kīlauea Volcano and implications for the shallow magma system: Chapter 11
Series title Geophysical Monograph
Chapter 11
ISBN 978-1-118-87204-8
DOI 10.1002/9781118872079.ch11
Volume 208
Year Published 2015
Language English
Publisher American Geophysical Union; John Wiley & Sons
Publisher location Washington, D.C.
Contributing office(s) Volcano Science Center
Description 22 p.
Larger Work Type Book
Larger Work Subtype Monograph
Larger Work Title Hawaiian volcanoes: From source to surface
First page 229
Last page 250
Conference Title AGU Chapman Conference
Conference Location Waikoloa, Hawai'i
Conference Date August 20-24, 2012
Country United States
State Hawaii
Other Geospatial Kīlauea Volcano