CALAIS , E.

The results from a global positioning system (GPS) experiment carried out in Brittany, France, in October 1999, aimed at measuring crustal displacements caused by ocean loading and quantifying their effects on GPS-derived tropospheric delay estimates, are presented. The loading effect in the vertical and horizontal position time series is...

Geophysical Journal International, v. 154, n. 1, p. 72-88, 2003. http://dx.doi.org/10.1046/j.1365-246X.2003.01935.x

Pure and Applied Geophysics, v. 161, p. 661-681, 2004. http://dx.doi.org/10.1007/s00024-003-2468-z

As a preliminary step for assessing the impact of global positioning system (GPS) refractive delay data in numerical weather prediction (NWP) models, the GPS zenith tropospheric delays (ZTDs) are analyzed from 51 permanent GPS sites in the western Mediterranean. The objectives are to estimate the error statistics necessary for future...

We use GPS measurements and models of postseismic deformation caused by seven M6.8 to 8.4 earthquakes that occurred in the past 100 years in Mongolia to assess the viscosity of the lower crust and upper mantle. We find an upper mantle viscosity between 1 Â 10 18 and 4 Â 10 18 Pa s. The presence of such a weak mantle is consistent with results...

Tectonophysics, v. 356, n. 4, p. 253-273, 2002. http://dx.doi.org/10.1016/S0040-1951(02)00389-X

The relevance of plate tectonics concepts to the description of deformation of large continental areas like Asia is subject to much debate. For some, the deformation of continents is better described by rigid motion of lithospheric blocks with strain concentrated along narrow fault zones. For others, it is better described by viscous flow of a...

Mogod earthquake (sequence). Each of the larger (M ! 8) earthquakes involved strike-slip faulting averaging more than 5 m and rupture lengths of several hundred kilometers. Available geologic data indicate that recurrence intervals on the major source faults are several thousands of years and distances of about 400 km separate the respective...

Direct measurements of surface deformation due to Glacial Isostatic Adjustment (GIA) in Europe have been so far mostly limited to the present-day uplift area. Here, we use permanent GPS networks results to investigate the significance of GIA effects in Europe south of Fennoscandia. We show that uplift in Fennoscandia is surrounded by subsidence...

Earth and Planetary Science Letters, v. 216, n. 1-2, p. 81-92, 2003. http://dx.doi.org/10.1016/S0012-821X(03)00482-5

Geomorphology, v. 43, n. 1-2, p. 33-54, 2002. http://dx.doi.org/10.1016/S0169-555X(01)00098-8

In the current plate tectonics paradigm, relative plate motions are assumed to remain unperturbed by temporal stress changes occurring during the seismic cycle, whereby stress slowly built up along tectonic plate boundaries is suddenly released by rapid fault slip during earthquakes. However, direct observations that could challenge such a...

Geology, v. 30, n. 7, p. 651-654 [445], 2002

Although the East African Rift (EAR) System is often cited as the archetype for models of continental rifting and break-up, its present-day kinematics remains poorly constrained. We show that the currently available GPS and earthquake slip vector data are consistent with (l) a present-day Nubia-Somalia Euler pole located between the southern...

Journal of Geophysical Research, v. 111, n. B6, p. 23 pp, 2006. http://dx.doi.org/10.1029/2005JB004253

After decades of research on continental tectonics, there is still no consensus on the mode of deformation of continents or on the forces that drive their deformation. In Asia the debate opposes edge-driven block models, requiring a strong lithosphere with strain localized on faults, to buoyancy-driven continuous models, requiring a viscous...

The Caribbean–North America plate boundary in the northeastern Caribbean shows a remarkable example of along-strike transition from plate boundary–normal subduction in the Lesser Antilles, oblique subduction with no strain partitioning in Puerto Rico, and oblique subduction/collision with strain partitioning further west in Hispaniola. We show...

Earth and Planetary Science Letters, v. 197, n. 3-4, p. 133-149, 2002. http://dx.doi.org/10.1016/S0012-821X(02)00470-3

Geophysical Research Letters, v. 35, p. L05304, 2008. http://dx.doi.org/10.1029/2007GL032781

In this paper, perturbations of the ionospheric Total Electron Content (TEC) are compared with geomagnetic oscillations. Comparison is made for a few selected periods, some during earthquakes in California and Japan and others at quiet periods in Israel and California. Anomalies in TEC were extracted using Global Positioning System (GPS)...

New GPS estimates of relative motion across the Jura Mountain Belt with respect to the Eurasian Plate indicate less than 1 mm/yr of convergence, considerably less than previous estimates. Velocity uncertainties have been evaluated by several methods and range from 0.2 to 0.5 mm/yr for the semi-permanent stations. The major,...

Baikal area show that: (1) the Baikal rift zone is currently opening at 4-5 mm yr −1 in a NW-SE direction and (2) the western part of the Amurian-north China block is moving eastward relative to Eurasia at 5-7 mm yr −1. These results are consistent with recent geodetic studies in Asia, and indicate that crustal motions in Mongolia and north...

We present new geodetic results of crustal velocities over a large part of northern Asia based on GPS measurements in the Baikal rift zone and Mongolia spanning the 1994-2002 period. We combine our results with the GPS velocity field for China of Wang et al. [2001] and derive a consistent velocity field for most of Asia. We find contrasted...

Geological estimates of vertical motions in the central part of the Lesser Antilles show subsidence on timescales ranging from 125.000 to 100 years, which has been interpreted to be caused by interseismic locking along the subduction megathrust. However, horizontal GNSS velocities show that the Lesser Antilles subduction interface is currently...