Geodetic evidence of back-arc spreading in the Mariana Trough

Details Geodetic evidence of back-arc spreading in the Mariana Trough Geodetic evidence of back-arc spreading in the Mariana Trough

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30l..27k&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 12, pp. 27-1, CiteID 1625, DOI 10.1029/2002GL016757

Physics

18

Geodesy And Gravity: Crustal Movements-Intraplate (8110), Tectonophysics: Dynamics Of Lithosphere And Mantle-General, Tectonophysics: Plate Motions-Present And Recent (3040)

Scientific paper

Repeated GPS surveys in the Mariana Islands show that the Mariana block is moving apart from the Philippine Sea plate. The velocities of the islands relative to the Philippine Sea plate range from about 15 mm/yr in the northern islands to about 45 mm/yr near Guam. The data also suggest convergence rates for the Mariana forearc with respect to the Pacific plate of 35-45 mm/yr at 19°N increasing to 55-70 mm/yr at 13.5°N. In addition, the velocity vectors show a slight north-south expansion of the arc. The estimated location of the Euler pole of the Mariana forearc with respect to the Philippine Sea plate is well south of the geographical point where the back-arc basin narrows to zero width.

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