NDLI: Modeling mantle dynamics in the Banda Sea triple junction: exploring a possible link to El Nino Southern Oscillation

Content Provider	IEEE Xplore Digital Library
Author	Leybourne, B.A. Adams, N.B.
Copyright Year	1999
Description	Author affiliation: Geophys. Div., Stennis Space Center, MS, USA (Leybourne, B.A.)
Abstract	The upwelling mantle within the Banda Sea is modeled using computer visualization techniques. The Banda Sea is considered a triple junction of the Pacific, Australian, and Eurasian Plates within the plate tectonic hypothesis. Evaluation of mantle depths from gravity and seismic studies indicates upwelling of mantle from approximately 30-40 km under the continental shelf of Australia to 21 km in the Banda Arc. From here the mantle rises to 14 km within the Weber Deep and finally reaches a depth of 7 km in the North Banda Sea. Seismic epicenter data delineate spatial boundaries of flow regimes and define magmatic migration routes. Epicenter magnitudes are visualized in 3 dimensions by color-coding. Topographic and bathymetric data from in-house sources define geographic position and geomorphology of the model domain, while altimetry data delineate the gravity field associated with a component of mantle dynamics using contour lines or interpolated color fields. Conceptual animation portrays upwelling and divergence of mantle flow structures (geostreams) underlying the tectonic trends of the region and the resulting counterflow within the volcanic arcs based on the surge tectonic hypothesis. This animation uses a series of color-coded arrows and particle systems to represent these flow structures in motion. Induced micro-gravity oscillations in the triple junction may be caused by planetary gravity waves. This phenomena is explored to determine the coupling effects with the atmospheric pressure flux of the Southern Oscillation, which modulates El Nino.
Starting Page	955
Ending Page	966
File Size	1395597
Page Count	12
File Format	PDF
ISBN	0780356284
DOI	10.1109/OCEANS.1999.805002
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-09-13
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Marine Technology Soc.
Subject Keyword	Altimetry Earthquakes Sea surface Surface topography Large-scale systems Optical propagation Catalogs Sea floor Gravity Dynamic compiler
Content Type	Text
Resource Type	Article

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