Converted wave imaging of the Toba Caldera, Indonesia

Koichi Sakaguchi, Hersh Gilbert, George Zandt

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Receiver functions calculated from data recorded by the 1995 PASSCAL Toba Seismic Experiment in northern Sumatra, Indonesia and the permanent station PSI reveal the presence of a low seismic velocity zone at between 8 and 14 km depth, which is interpreted to be the top of a magma reservoir. The Moho under the Toba caldera lies near 30 km with a localized thickened region that reaches 39 km beneath the eastern edge of the caldera with an abrupt shallowing to the northeast. This thickened crust may be where hot gabbroic material underplates the base of the crust to serve as the heat source for shallower volcanism. Alternatively, the thickened crust and Moho offset may be due to localized crustal thickening when this region was situated in a sharp restraining bend of a now extinct segment of the Sumatran fault.

Original languageEnglish (US)
Article numberL20305
JournalGeophysical Research Letters
Volume33
Issue number20
DOIs
StatePublished - Oct 28 2006

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Indonesia
calderas
caldera
crusts
crust
Moho
crustal thickening
heat source
heat sources
seismic velocity
magma chamber
magma
volcanism
receivers
stations
experiment

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Converted wave imaging of the Toba Caldera, Indonesia. / Sakaguchi, Koichi; Gilbert, Hersh; Zandt, George.

In: Geophysical Research Letters, Vol. 33, No. 20, L20305, 28.10.2006.

Research output: Contribution to journalArticle

Sakaguchi, Koichi ; Gilbert, Hersh ; Zandt, George. / Converted wave imaging of the Toba Caldera, Indonesia. In: Geophysical Research Letters. 2006 ; Vol. 33, No. 20.
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