Location and size of the shallow magma reservoir beneath Klauea caldera, constraints from near-source V-p/V-s ratios

TitleLocation and size of the shallow magma reservoir beneath Klauea caldera, constraints from near-source V-p/V-s ratios
Publication TypeJournal Article
Year of Publication2015
AuthorsLin G.Q, Amelung F., Shearer PM, Okubo P.G
JournalGeophysical Research Letters
Volume42
Pagination8349-8357
Date Published2015/10
Type of ArticleArticle
ISBN Number0094-8276
Accession NumberWOS:000364782500012
Keywordsattenuation; california; continuous gps; earthquake; elastic properties; hawaiian volcanos; Kilauea; kilauea volcano; magma reservoir; saturated cracked solids; seismic tomography; structure; velocity; Vp; Vs
Abstract

We present high-resolution compressional wave to shear wave velocity ratios (V-p/V-s) beneath Klauea's summit caldera by applying an in situ estimation method using waveform cross-correlation data for three similar earthquake clusters. We observe high V-p/V-s ratios (1.832 and 1.852) for two event clusters surrounded by the low background V-p/V-s value of 1.412 at similar to 2.1km depth below the surface. These high and low V-p/V-s ratios can be explained by melt- and CO2-filled cracks, respectively, based on a theoretical crack model. The event cluster with the highest V-p/V-s ratio consists of long-period events that followed the 1997 East Rift Zone eruption, indicating their association with fluid and magma movement. The depths of the two clusters with high V-p/V-s ratios are consistent with the magma reservoir location inferred from geodetic observations. Their locations east and north of Halemaumau crater suggest a horizontal extent of a few kilometers for the reservoir.

DOI10.1002/2015gl065802
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