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Three-dimensional velocity structure of the Kilauea caldera, Hawaii

Geophysical Research Letters

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Abstract

High-resolution velocity models (0.5 km resolution) of the Kilauea caldera region are obtained by the tomographic inversion of both P- and S-waye arrival times. Data are from the permanent Hawaiian Volcano Observatory (HVO) seismic network, a broadband seismic network, and a temporary array of stations centered on the southern boundary of the caldera. A low-velocity P-wave anomaly is imaged centered on the southeastern edge of the caldera, with a velocity contrast of about 10% and a volume of 27 km3. The VP/VS model mimics the spatial extent of the P-wave anomaly, but is partitioned into two discrete anomalous volumes centered on the southern boundary of the caldera and on the upper east rift of the volcano. The corresponding Poisson's ratio in these zones is high (?? = 0.25-0.32) which is consistent with a densely-cracked, hot volume which may contain partial melt. The large-scale features of the models are consistent with results obtained from an earlier, larger-scale (2 km resolution) tomographic image of Kilauea Volcano based on HVO network data.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Three-dimensional velocity structure of the Kilauea caldera, Hawaii
Series title:
Geophysical Research Letters
Volume
26
Issue:
18
Year Published:
1999
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters
First page:
2805
Last page:
2808