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Shallow degassing events as a trigger for very-long-period seismicity at Kilauea Volcano, Hawaii

May 12, 2011

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.

Citation Information

Publication Year 2011
Title Shallow degassing events as a trigger for very-long-period seismicity at Kilauea Volcano, Hawaii
DOI 10.1007/s00445-011-0475-y
Authors Matthew R. Patrick, David C. Wilson, David Fee, Tim R. Orr, Don Swanson
Publication Type Article
Publication Subtype Journal Article
Series Title Bulletin of Volcanology
Index ID 70198343
Record Source USGS Publications Warehouse
USGS Organization Geologic Hazards Science Center; Volcano Science Center