Active Tectonics of the North Chilean Marine Forearc and Adjacent Oceanic Nazca Plate

Balancing the force budget of plate tectonics along the Nazca/South America plate margin

Active Pacific North America Plate boundary tectonics as evidenced by seismicity in the oceanic lithosphere offshore Baja California, Mexico

S U M M A R Y Pacific Ocean crust west of southwest North America was formed by Cenozoic seafloor spreading between the large Pacific Plate and smaller microplates. The eastern limit of this seafloor, the continent–ocean boundary, is the fossil trench along which the microplates subducted and were mostly destroyed in Miocene time. The Pacific–North America Plate boundary motion today is concent...

Decelerating Nazca-South America and Nazca-Pacific Plate Motions

Space geodetic estimates of the rate of Nazca-South America convergence and Nazca-Pacific spreading averaging over several years show that present day rates are significantly slower than the 3 million year average NUVEL-1A model. The implied rates of deceleration are consistent with longer term trends extending back to at least 20 Ma, about the time of initiation of Andes growth, and may reflec...

Geomorphic Expression of Active Tectonics in a Rapidly-deforming Forearc, Sila Massif, Calabria, Southern Italy

We examine the tectonic geomorphology of La Sila, Calabria, southern Italy, a high-standing (1500 m) plateau surrounded by crustal extension, with map, DEM, and field data. These data are used to constrain a simple geodynamic model that describes short-wavelength deformation of the plateau rim. Topographic metrics including drainage patterns, river longitudinal profiles, and swath profiles are ...

8 . Seamarc Ii Sonar Imagery a N D Bathymetry of the Nazca Plate a N D Peru Forearc , Odp Leg

In March 1985, SeaMARC II side-scanning sonar and swathbathymetry surveys were conducted on the submarine Peru forearc as part of the studies to select drilling sites for Leg 112 of the Ocean Drilling Program. Most of these surveys were concentrated in two areas: (1) between 8°45'S and 9°35'S, which is north of where the Mendana Fracture Zone (MFZ) enters the Peru-Chile Trench, and (2) between ...