- Experiment Name: Tonga-Fiji Dual Array Experiment
- PI: Wiens, Smith
- Email: doug@kermadec.wustl.edu
- Sponsor: NSF
- Inst: Wash U, Wash U
- Start_Date: 7/1/2001
- End_Date: 7/1/2002
- Lat: -18.5
- Long: 1.5
- Chan6: 6
- Chan3: 22
- Broadband: 6
- ShortPeriod: 22
- Descr: We propose to su\tudy the structure of the Tonga subduction
zone using a one-year deployment of two dense seismic arrays; one deployed
in the active arc (Tonga) and the other in the backarc (Fiji). The structure
of the subducting oceanic crust and mantle wedge will be studied using
a tight array of 11 sensors in Tonga. The array will enable characterization
of dispersed guided phases within the subducted cre\ust. A second array
of 11 sensors w\in Fiji will be used to study reflected and converted
local arrivals that interact with the 410, 520, and 670 discontinuities
near the Tonga slab. This array will be used to study the depth, velocity
contrast, and sharpness of the discontinuities as a function of distance
from the slab core.
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