Geodetic evidence of back‐arc spreading in the Mariana Trough

  title={Geodetic evidence of back‐arc spreading in the Mariana Trough},
  author={Teruyuki Kato and John Beavan and Takeshi Matsushima and Yoshiko Kotake and Juan T. Camacho and Shigeru Nakao},
  journal={Geophysical Research Letters},
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… 

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Although sea floor spreading of some sort has created marginal basins, it is not known whether this spreading is similar to that at midocean ridges. Back arc spreading in the Mariana Trough occurs

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