We obtained a 3D image of crust and mantle seismic velocity gradients beneath the state Alaska using common-conversion point (CCP) stacking S-to-p converted body waves recorded by hundreds stations from NSF EarthScope Transportable Array other portable arrays permanent networks. Moho depths delineate thick underthrust Yakutat terrane crustal root Brooks Range. The North American lithosphere is ...

the iranian plateau is characterized by diverse tectonic domains, including the continental collisions (e.g. the zagros and alborz mountains) and oceanic plate subduction (e.g. makransubduction zone). to derive a detailed image of the crust–mantle (moho) and lithosphere–asthenosphere (lab) boundaries in some tectonically units of the iranian plateau, we used a large number of s receiver functio...

The right to search for truth implies also a duty. One must not conceal any part of what one has discovered to be true. O verview The lithosphere clearly controls the location of volcanism. The nature and volume of the volcan-ism and the presence of 'melting anomalies' or 'hotspots,' however, reflect the intrinsic chemical and petrologic heterogeneity of the upper mantle. Melting anomalies-shal...

The lithospheric architecture of passive margins is crucial for understanding the tectonic processes that caused breakup Gondwana. We highlight evolution South Atlantic by a simple thermal lithosphere-asthenosphere boundary (LAB) model based on onset and cessation rifting, crustal thickness, stretching factors. simulate thinning select LAB as T = 1,330°C isotherm, which calculated 1D advection ...

Rocks metamorphosed under high-pressure (HP) and ultra high-pressure (UHP) conditions in subduction zones come back to the surface relatively soon after their burial and at rates comparable to plate boundary velocities. In the Mediterranean realm, their occurrence in several belts related to a single subduction event shows that the burial-exhumation cycle is a recurrent transient process. Using...

S U M M A R Y We describe a method to invert surface wave dispersion data for a model of shear velocities with uncertainties in the crust and uppermost mantle. The inversion is a multistep process, constrained by a priori information, that culminates in a Markov-chain Monte-Carlo sampling of model space to yield an ensemble of acceptable models at each spatial node. The model is radially anisot...

We examine a number of first order features of Pannonian basin evolution in terms of the feedback relation between passive far-field induced extension and active Raleigh-Taylor instable upwelling of the asthenosphere. We show that active mantle upwelling following a phase of passive extension are viable mechanisms explaining the Pannonian basin formation. The dynamic interplay between far-field...