Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 41, Issue 10, Pages 3413-3421Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL059819
Keywords
long-period event; relocation; Kilauea; Hawaii
Categories
Funding
- NSF [EAR-1045035]
- Cecil H. and Ida M. Green Foundation at the Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography
- Directorate For Geosciences
- Division Of Earth Sciences [1045035] Funding Source: National Science Foundation
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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.
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