2014_Xu_Xiao_Dissertation
... The first project targets slab dip variations of the Caribbean Plate along the Muertos Trough, which bounds the Puerto Rico-Virgin Islands tectonic block on the south. Results of this research are intended to contribute to understanding the kinematic evolution of this region and the associated natur ...
... The first project targets slab dip variations of the Caribbean Plate along the Muertos Trough, which bounds the Puerto Rico-Virgin Islands tectonic block on the south. Results of this research are intended to contribute to understanding the kinematic evolution of this region and the associated natur ...
extended basement beneath the intracratonic rifted basins of the
... beneath the so-called “acoustic” basement were made. Moreover, until recently it was believed that, except for a fortuitous situation, no penetration could be achieved in a deformed basement complex and thet metamorphic rocks were seismically transparent. An industry line b-b’ recorded over the Bona ...
... beneath the so-called “acoustic” basement were made. Moreover, until recently it was believed that, except for a fortuitous situation, no penetration could be achieved in a deformed basement complex and thet metamorphic rocks were seismically transparent. An industry line b-b’ recorded over the Bona ...
lithosphere_42344
... • There are two classes of seismic waves, body waves and surface waves • There two types of body wave, compressional and shear waves, which propagate at different speeds: VP = [ (K + 4/3)/ ]1/2 , VS = ( / )1/2 • Surface waves travel along the surface, and the two most important type of surface ...
... • There are two classes of seismic waves, body waves and surface waves • There two types of body wave, compressional and shear waves, which propagate at different speeds: VP = [ (K + 4/3)/ ]1/2 , VS = ( / )1/2 • Surface waves travel along the surface, and the two most important type of surface ...
Kerguelen plateau : a volcanic passive margin fragment ?
... dominates crustal thickening. Seismic velocities in oceanic layer 2 vary widely in oceanic crust and thus cannot indicate crustal type. The average seismic velocity in layer 3 increases as crustal thickness increases (Mutter and Mutter, 1993), which agrees with the observation that oceanic plateaus ...
... dominates crustal thickening. Seismic velocities in oceanic layer 2 vary widely in oceanic crust and thus cannot indicate crustal type. The average seismic velocity in layer 3 increases as crustal thickness increases (Mutter and Mutter, 1993), which agrees with the observation that oceanic plateaus ...
surface wave - Madison Local Schools
... • The more rigid the material is, the faster the P wave travels through it. • S wave a secondary wave, or shear wave; a seismic wave that causes particles of rock to move in a side-toside direction perpendicular to the direction in which the wave is traveling • S waves are the second-fastest seismic ...
... • The more rigid the material is, the faster the P wave travels through it. • S wave a secondary wave, or shear wave; a seismic wave that causes particles of rock to move in a side-toside direction perpendicular to the direction in which the wave is traveling • S waves are the second-fastest seismic ...
SeiSmological grand challengeS in UnderStanding earth`S
... elasticity, and applied mathematics. Modern seismological systems utilize state-of-theart digital ground motion recording sensors and real-time communications systems, and anyone can openly access many seismological data archives. Seismologists “keep their ear” on Earth’s internal systems, listening ...
... elasticity, and applied mathematics. Modern seismological systems utilize state-of-theart digital ground motion recording sensors and real-time communications systems, and anyone can openly access many seismological data archives. Seismologists “keep their ear” on Earth’s internal systems, listening ...
Seismic activity of the Nevados de Chillán volcanic complex after the
... earthquake (Hill et al., 1993), the increase of seismicity of the Uturuncu volcano, Bolivia, immediately after the arrival of the surface waves induced by the Mw8.8 Maule earthquake (Jay et al., 2011), and the sudden increase in volcano-tectonic (VT) seismic activity at Llaima volcano, Chile, after ...
... earthquake (Hill et al., 1993), the increase of seismicity of the Uturuncu volcano, Bolivia, immediately after the arrival of the surface waves induced by the Mw8.8 Maule earthquake (Jay et al., 2011), and the sudden increase in volcano-tectonic (VT) seismic activity at Llaima volcano, Chile, after ...
Subduction and collision processes in the Central Andes
... plateaux (about 4 km) has been explained as an isostatic response to crustal thickening2,6. A low average P-wave velocity and low Poisson's ratio in the crust of the northern Altiplano have been reported from seismic observations, indicating tectonic shortening as the dominant mechanism of crustal t ...
... plateaux (about 4 km) has been explained as an isostatic response to crustal thickening2,6. A low average P-wave velocity and low Poisson's ratio in the crust of the northern Altiplano have been reported from seismic observations, indicating tectonic shortening as the dominant mechanism of crustal t ...
letters - Institut de Physique du Globe de Paris
... dynamics of the lower-crustal formation. Off-axis, the Moho reflections are observed between 1.9 and 2.3 s below the sea floor (Fig. 3a), which are similar to those observed in ref. 17 using widely spaced 2D seismic lines, whereas these reflections are 2.6–2.9 s below the sea floor beneath the wide ...
... dynamics of the lower-crustal formation. Off-axis, the Moho reflections are observed between 1.9 and 2.3 s below the sea floor (Fig. 3a), which are similar to those observed in ref. 17 using widely spaced 2D seismic lines, whereas these reflections are 2.6–2.9 s below the sea floor beneath the wide ...
Research Poster 36 x 48 - Western Oregon University
... permanent seismographs in the area, so 20 portable seismographs were rapidly deployed by from local Universities. By October, the U.S. Geological Survey installed four permanent seismographs in the epicentral region. Data from these instruments is now telemetered to the University of Washington, whe ...
... permanent seismographs in the area, so 20 portable seismographs were rapidly deployed by from local Universities. By October, the U.S. Geological Survey installed four permanent seismographs in the epicentral region. Data from these instruments is now telemetered to the University of Washington, whe ...
What is an Earthquake?
... atoms may escape – leading to a date that is too young. – However, if all of the daughters are forced out during metamorphism, – then the date obtained would be the time of metamorphism—a useful piece of information. ...
... atoms may escape – leading to a date that is too young. – However, if all of the daughters are forced out during metamorphism, – then the date obtained would be the time of metamorphism—a useful piece of information. ...
Complex subduction and small-scale convection revealed by body
... velocity variations that are not well constrained by our data. In areas with only TA data, good crossing ray coverage is not achieved until ~80 km depth. However, because we use more than 1700 stations in addition to the TA (N700 for S data) there is good crossing ray coverage in the 60 km layer thr ...
... velocity variations that are not well constrained by our data. In areas with only TA data, good crossing ray coverage is not achieved until ~80 km depth. However, because we use more than 1700 stations in addition to the TA (N700 for S data) there is good crossing ray coverage in the 60 km layer thr ...