Anthony R. Lowry

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[1] Geodetic measurements from a network of permanent GPS stations along the Pacific coast of Mexico reveal a large ‘‘silent earthquake’’ along the segment of the Cocos-North American plate interface identified as the Guerrero seismic gap. The event began in October of 2001 and lasted for 6– 7 months. Average slip of 10 cm produced measurable displacements(More)
The Guerrero region of southern Mexico has accumulated more than 5 m of relative plate motion since the last major earthquake. In early 1998, a continuous GPS site in Guerrero recorded a transient displacement. Modeling indicates that anomalous fault slip propagated from east to west along-strike of the subduction megathrust. Campaign GPS and leveling data(More)
Global Positioning System (GPS) measurements at subduction plate boundaries often record fault movements similar to earthquakes but much slower, occurring over timescales of approximately 1 week to approximately 1 year. These 'slow slip events' have been observed in Japan, Cascadia, Mexico, Alaska and New Zealand. The phenomenon is poorly understood, but(More)
A large-scale slow slip event with a magnitude equivalent to Mw = 7.4 has been observed at seven continuous GPS stations located in the Guerrero–Oaxaca region, southern Mexico, for several months from late 2001 to middle 2002 [Geophys. Res. Lett. (2003) 30: doi: 10.1029/2003GL017219]. We re-analyzed the GPS time series data to estimate the displacements(More)
Large-scale deformation of continents remains poorly understood more than 40 years after the plate tectonic revolution. Rock flow strength and mass density variations both contribute to stress, so both are certain to be important, but these depend (somewhat nebulously) on rock type, temperature and whether or not unbound water is present. Hence, it is(More)
We are characterizing Rayleigh wave attenuation for Eurasia using tomographic inversion of surface-wave amplitude data. These attenuation models will be used to calibrate the regional surface-wave magnitude scale and to extend the teleseismic Ms-mb event discriminant to regional distances. Our research is based on the successful proofof-concept study(More)
Understanding the causes of intraplate earthquakes is challenging, as it requires extending plate tectonic theory to the dynamics of continental deformation. Seismicity in the western United States away from the plate boundary is clustered along a meandering, north-south trending 'intermountain' belt. This zone coincides with a transition from thin,(More)
Improved recovery of the spatial variability in the effective elastic thickness, Te, of the lithosphere is important to interpret Earth’s structure and geodynamics. Here we use synthetic topography and gravity data to systematically compare the recovery of Te using the multitaper windowing scheme of Pérez-Gussinyé et al. (2004, 2007) with the wavelet(More)
a r t i c l e i n f o a b s t r a c t Isostatic and dynamic models of Earth's surface topography can provide important insights into the driving processes of tectonic deformation. We analyze these two estimates for the tectonically-active western United States using refined structural models derived from EarthScope USArray. For the crust, use of recent Moho(More)