A GPS estimate of relative motion between North and South America
نویسندگان
چکیده
GPS velocity data are used to estimate the Euler Argentina (LPGS; 1.2 years). Data spanning 2.0 years are vector describing rigid body motion of North America relative to South America. Assuming the boundary between the North and South American plates is located near the Fifteen Twenty fracture zone in the equatorial Atlantic, the Euler vector predicts extension across the Royal Trough up to 1 mrn/yr, and convergence across the Barracuda Ridge at about 2 mrn/yr, in agreement with geological estimates averaged over tens of millions of years. Further west, convergence between North and South America at rates up to 8 mrn/yr may contribute to deformation of the Caribbean plate along its southwest boundary with South America.
منابع مشابه
New kinematic models for Pacific - North America motion from 3 Ma to present , I : Evidence for steady motion and biases in the NUVEL - 1 A model
We use velocities derived from 2-4.5 years of continuous GPS observations at 21 sites on the Pacific and North American plates along with a subset of the NUVEL-1A data to examine the steadiness of PacificNorth America motion since 3.16 Ma, the transfer of Baja California to the Pacific plate, and the magnitude of biases in the NUVEL-1A estimate of Pacific-North America motion. We find that Paci...
متن کاملNorthwest Basin and Range tectonic deformation observed with the Global Positioning System , 1999 – 2003
[1] We use geodetic velocities obtained with the Global Positioning System (GPS) to quantify tectonic deformation of the northwest Basin and Range province of the western United States. The results are based on GPS data collected in 1999 and 2003 across five new quasi-linear networks in northern Nevada, northeast California, and southeast Oregon. The velocities show 3 mm/yr westward movement of...
متن کاملContemporary strain rates in the northern Basin and Range province from GPS data
[1] We investigate the distribution of active deformation in the northern Basin and Range province using data from continuous GPS (CGPS) networks, supplemented by additional campaign data from the Death Valley, northern Basin and Range, and Sierra Nevada–Great Valley regions. To understand the contemporary strain rate field in the context of the greater Pacific (P)–North America (NA) plate boun...
متن کاملQuantitative assessment of relative tectonic activity in the Alamarvdasht river basin, south of Iran
Tectonic processes are major factors controlling landform development in tectonically active areas. In order to evaluate quantitative measurement of tectonic activities in the Alamarvdasht basin in the south of Iran, six different morphological indices including stream-gradient index (SL), drainage basin asymmetry (Af), hypsometric integral (Hi), valley floor width-valley height ratio (Vf), dra...
متن کاملTectonic control of subsidence and southward displacement of southeast Louisiana with respect to stable North America
[1] GPS data collected between 1995 and 2006 suggest that southeast Louisiana, including New Orleans and the larger Mississippi Delta, are both subsiding vertically and moving southward with respect to stable North America. Both motions are likely related due to their common tectonic setting. Subsidence in the New Orleans area occurs in part because it is located in the hanging wall of a large ...
متن کامل