Upper mantle discontinuity structure in the region of the Tonga Subduction Zone

Publication Status is "Submitted" Or "In Press: 
LDEO Publication: 
Publication Type: 
Year of Publication: 
2001
Editor: 
Journal Title: 
Geophysical Research Letters
Journal Date: 
May 1
Place Published: 
Tertiary Title: 
Volume: 
28
Issue: 
9
Pages: 
1855-1858
Section / Start page: 
Publisher: 
ISBN Number: 
0094-8276
ISSN Number: 
Edition: 
Short Title: 
Accession Number: 
ISI:000168243100047
LDEO Publication Number: 
Call Number: 
Abstract: 

We study the mantle structure below the southwest Pacific in order to examine the geometry of the Tonga slab at depth and its interaction with the 410- and 660-km discontinuities thereafter called the 410 and the 660). We utilize data from stations of both the Lau Basin Ocean Bottom Seismogram experiment and island stations of the Southwest Pacific Seismic Experiment. The tectonic complexity of this region, containing both the Tonga subduction zone and the associated Lau back are spreading center make it an ideal area to investigate the upper mantle discontinuities using a high resolution technique such as common conversion point slacking of receiver functions. We produce a high-resolution image of the upper mantle near the Tonga subduction zone to show the interaction between the discontinuities and the subducting slab. Our results show the 410 uplifted by 30 km near the Tonga slab and the 660 depressed by 20 to 30 km as expected for thermally controlled olivine phase transitions.

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424QNTimes Cited:9Cited References Count:19

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