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Seismic tomography of compressional wave attenuation structure for Klauea Volcano, Hawaii

TitleSeismic tomography of compressional wave attenuation structure for Klauea Volcano, Hawaii
Publication TypeJournal Article
Year of Publication2015
AuthorsLin G.Q, Shearer PM, Amelung F., Okubo P.G
JournalJournal of Geophysical Research-Solid Earth
Date Published2015/04
Type of ArticleArticle
ISBN Number2169-9313
Accession NumberWOS:000354563200026
Keywords3-dimensional velocity structure; attenuation; cascade range; crustal; east rift-zone; Kilauea; kilauea volcano; long-valley-caldera; mauna-loa; p-wave; Salton Trough; seismic tomography; southern california; structure

We present a frequency-independent three-dimensional (3-D) compressional wave attenuation model (indicated by the reciprocal of quality factor Q(p)) for Klauea Volcano in Hawaii. We apply the simul2000 tomographic algorithm to the attenuation operator t(*) values for the inversion of Q(p) perturbations through a recent 3-D seismic velocity model and earthquake location catalog. The t(*) values are measured from amplitude spectra of 26708 P wave arrivals of 1036 events recorded by 61 seismic stations at the Hawaiian Volcanology Observatory. The 3-D Q(p) model has a uniform horizontal grid spacing of 3km, and the vertical node intervals range between 2 and 10km down to 35km depth. In general, the resolved Q(p) values increase with depth, and there is a correlation between seismic activity and low-Q(p) values. The area beneath the summit caldera is dominated by low-Q(p) anomalies throughout the entire resolved depth range. The Southwest Rift Zone and the East Rift Zone exhibit very high Q(p) values at about 9km depth, whereas the shallow depths are characterized with low-Q(p) anomalies comparable with those in the summit area. The seismic zones and fault systems generally display relatively high Q(p) values relative to the summit. The newly developed Q(p) model provides an important complement to the existing velocity models for exploring the magmatic system and evaluating and interpreting intrinsic physical properties of the rocks in the study area.

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