High-precision relocation of long-period events beneath the summit region of Kilauea Volcano, Hawai'i, from 1986 to 2009

TitleHigh-precision relocation of long-period events beneath the summit region of Kilauea Volcano, Hawai'i, from 1986 to 2009
Publication TypeJournal Article
Year of Publication2014
AuthorsMatoza RS, Shearer PM, Okubo P.G
JournalGeophysical Research Letters
Volume41
Pagination3413-3421
Date Published2014/05
Type of ArticleArticle
ISBN Number0094-8276
Accession NumberWOS:000337610200013
Keywordsarray analyses; classification; earthquakes; hawaii; hydrothermal system; Kilauea; location; long-period event; magma; montserrat; relocation; seismicity; spatial extent; tremor data
Abstract

Long-period (0.5-5 Hz, LP) seismicity has been recorded for decades in the summit region of Klauea Volcano, Hawaii, and is postulated as linked with the magma transport and shallow hydrothermal systems. To better characterize its spatiotemporal occurrence, we perform a systematic analysis of 49,030 seismic events occurring in the Klauea summit region from January 1986 to March 2009 recorded by the approximate to 50-station Hawaiian Volcano Observatory permanent network. We estimate 215,437 P wave spectra, considering all events on all stations, and use a station-averaged spectral metric to consistently classify LP and non-LP seismicity. We compute high-precision relative relocations for 5327 LP events (43% of all classified LP events) using waveform cross correlation and cluster analysis with 6.4million event pairs, combined with the source-specific station term method. The majority of intermediate-depth (5-15km) LPs collapse to a compact volume, with remarkable source location stability over 23 years indicating a source process controlled by geological or conduit structure.

DOI10.1002/2014gl059819
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