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Deep magmatic structures of Hawaiian volcanoes, imaged by three-dimensional gravity models

Geology

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Abstract

A simplified three-dimensional model for the island of Hawai'i, based on 3300 gravity measurements, provides new insights on magma pathways within the basaltic volcanoes. Gravity anomalies define dense cumulates and intrusions beneath the summits and known rift zones of every volcano. Linear gravity anomalies project southeast from Kohala and Mauna Kea summits and south from Huala??lai and Mauna Loa; these presumably express dense cores of previously unrecognized rift zones lacking surface expression. The gravity-modeled dense cores probably define tholeiitic shield-stage structures of the older volcanoes that are now veneered by late alkalic lavas. The three-dimensional gravity method is valuable for characterizing the magmatic systems of basaltic oceanic volcanoes and for defining structures related to landslide and seismic hazards.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Deep magmatic structures of Hawaiian volcanoes, imaged by three-dimensional gravity models
Series title:
Geology
Volume
28
Issue:
10
Year Published:
2000
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geology
First page:
883
Last page:
886