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Shallow magma accumulation at K??lauea Volcano, Hawai'i, revealed by microgravity surveys

Geology

By:
, , , , ,
DOI: 10.1130/G31323.1

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Abstract

Using microgravity data collected at K??lauea Volcano, Hawai'i (United States), between November 1975 and January 2008, we document significant mass increase beneath the east margin of Halema'uma'u Crater, within K??lauea's summit caldera. Surprisingly, there was no sustained uplift accompanying the mass accumulation. We propose that the positive gravity residual in the absence of significant uplift is indicative of magma accumulation in void space (probably a network of interconnected cracks), which may have been created when magma withdrew from the summit in response to the 29 November 1975 M = 7.2 south flank earthquake. Subsequent refilling documented by gravity represents a gradual recovery from that earthquake. A new eruptive vent opened at the summit of K??lauea in 2008 within a few hundred meters of the positive gravity residual maximum, probably tapping the reservoir that had been accumulating magma since the 1975 earthquake. ?? 2010 Geological Society of America.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Shallow magma accumulation at K??lauea Volcano, Hawai'i, revealed by microgravity surveys
Series title:
Geology
DOI:
10.1130/G31323.1
Volume
38
Issue:
12
Year Published:
2010
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1139
Last page:
1142
Number of Pages:
4