Coronavirus Information for the UC San Diego Community

Our leaders are working closely with federal and state officials to ensure your ongoing safety at the university. Stay up to date with the latest developments. Learn more.

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
Student Publication: 
No
sharknado