Southwest Pacific Seismic Experiment (SPASE)
+1 314 935-6517
+1 314 935-7361
Dept Earth and Planet. Sci., Washington Univ., St Louis, MO, U.S.A.
Wiens, D. A., and N. O. SniderRepeating Deep Earthquakes: Evidence for Fault Reactivation at Great Depth, Science, 293, 1463-1466, 2001. Smith, G. P., D. A. Wiens, K. M. Fischer, L. M. Dorman, S. C. Webb, and J. A. Hildebrand, A Complex Pattern of Mantle Flow in the Lau Backarc, Science, 292, 713-716, 2001. Yingbiao Xu, D. A. Wiens, K. D. Koper, and P. J. Shore, Crust and Upper Mantle Structure of Southwest Pacific from Regional Waveform Inversion and Receiver Function Analysis, Fall AGU, 1996. Erich G. Roth, Douglas A. Wiens, Patrick J. Shore and Yingbiao Xu, Transition zone discontinuities beneath Tonga from ScS reverberations: An uplifted 670?, Fall AGU, 1996. Keith Koper, D.A. Wiens, D. Zhao, L. Dorman, S. Webb, J. Hildebrand, Can seismology resolve a metastable olivine wedge in the Tonga Subduction Zone?, Fall AGU, 1996.
The SPaSE project was a two year deployment of 12 broadband PASSCAL instruments in Fiji, Tonga, and Niue Island. Earthquakes recorded by SPaSE stations are used to study the structure of the subducting slab using phases converted at the upper slab interface, dispersion of phases traveling up the slab, and comparison of travel times between phases traveling inside and outside of the slab. The structure of the back arc basin has been studied utilizing regional earthquakes and SKS splitting from teleseisms. This study has improved knowledge about the source processes of deep earthquakes in the most active deep seismic zone in the world, as well as provide better constraints on the tectonics of the deep slab, shallow trench and back-arc basin regions.
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