Location and size of the shallow magma reservoir beneath Ki¯lauea caldera, constraints from near-source Vp/Vs ratios

Guoqing Lin, Falk C Amelung, Peter M. Shearer, Paul G. Okubo

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We present high-resolution compressional wave to shear wave velocity ratios (Vp/Vs) beneath Ki¯lauea's summit caldera by applying an in situ estimation method using waveform cross-correlation data for three similar earthquake clusters. We observe high Vp/Vs ratios (1.832 and 1.852) for two event clusters surrounded by the low background Vp/Vs value of 1.412 at ∼2.1 km depth below the surface. These high and low Vp/Vs ratios can be explained by melt- and CO2-filled cracks, respectively, based on a theoretical crack model. The event cluster with the highest Vp/Vs 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 Vp/Vs ratios are consistent with the magma reservoir location inferred from geodetic observations. Their locations east and north of Halema'uma'u crater suggest a horizontal extent of a few kilometers for the reservoir. Key Points Low in situ Vp/Vs ratio dominating the summit caldera High in situ Vp/Vs ratios observed east and north of Halema'uma'u crater The anomalous features can be explained by theoretical modeling and consistent with other data

Original languageEnglish (US)
Pages (from-to)8349-8357
Number of pages9
JournalGeophysical Research Letters
Volume42
Issue number20
DOIs
StatePublished - Oct 28 2015

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calderas
caldera
magma chamber
magma
crater
crack
craters
cracks
estimation method
rift zone
wave velocity
S-wave
volcanic eruption
melt
volcanic eruptions
cross correlation
S waves
earthquake
waveforms
earthquakes

Keywords

  • Kilauea
  • magma reservoir
  • Vp/Vs

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Geophysics

Cite this

Location and size of the shallow magma reservoir beneath Ki¯lauea caldera, constraints from near-source Vp/Vs ratios. / Lin, Guoqing; Amelung, Falk C; Shearer, Peter M.; Okubo, Paul G.

In: Geophysical Research Letters, Vol. 42, No. 20, 28.10.2015, p. 8349-8357.

Research output: Contribution to journalArticle

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