Large-Scale Thermo-chemical Structure of the Deep Mantle
... models (Ritsema et al. 2011) suggest that it may split into a western and an eastern province with a gap of several hundreds of kilometers in between. Both provinces have a trapezoidal shape, but the western region has stronger topography than the eastern region. Sharp boundaries at the southern ed ...
... models (Ritsema et al. 2011) suggest that it may split into a western and an eastern province with a gap of several hundreds of kilometers in between. Both provinces have a trapezoidal shape, but the western region has stronger topography than the eastern region. Sharp boundaries at the southern ed ...
a post-Gravity Recovery and Interior Laboratory reassessment
... tentative evidence for a crustal thickness of 75 km in the highlands at the Apollo 16 site. These three seismic analyses were the basis of numerous bulk Moon compositional studies that were published over two decades. A summary of how measurements of the seismically determined and average crustal th ...
... tentative evidence for a crustal thickness of 75 km in the highlands at the Apollo 16 site. These three seismic analyses were the basis of numerous bulk Moon compositional studies that were published over two decades. A summary of how measurements of the seismically determined and average crustal th ...
Notes on global shear wave splitting analysis
... t1 t2 option to the ttsac macro to show only a portion of the trace in memory, where t1 is the start time, and t2 the end time. You can also add arrival times directly to SAC files’ headers using the taup setsac command in the shell, remembering to use the -evdpkm flag to tell TauP that the units of ...
... t1 t2 option to the ttsac macro to show only a portion of the trace in memory, where t1 is the start time, and t2 the end time. You can also add arrival times directly to SAC files’ headers using the taup setsac command in the shell, remembering to use the -evdpkm flag to tell TauP that the units of ...
Crustal accretion at mid-ocean ridges and backarc
... ridge discontinuities at smaller scales [3] have been identified (e.g., overlapping spreading centers (OSCs) [4], nontransform offsets (NTOs) [5], and propagators [6]). These studies have also shown that fast– and slowspreading ridges display notable differences in segmentation, seafloor morphology, ...
... ridge discontinuities at smaller scales [3] have been identified (e.g., overlapping spreading centers (OSCs) [4], nontransform offsets (NTOs) [5], and propagators [6]). These studies have also shown that fast– and slowspreading ridges display notable differences in segmentation, seafloor morphology, ...
Crustal structure of the Hatton and the conjugate east Greenland
... 2007]. In this paper we report recent, detailed studies of the Hatton margin and then examine the nature of this asymmetry with the conjugate margin and discuss possible causes for it. [4] When volcanic continental margins were first studied in detail, it became apparent that the widespread extrusiv ...
... 2007]. In this paper we report recent, detailed studies of the Hatton margin and then examine the nature of this asymmetry with the conjugate margin and discuss possible causes for it. [4] When volcanic continental margins were first studied in detail, it became apparent that the widespread extrusiv ...
Status of CFEB, DMB, DDU T.Y. Ling (Reported by J. Gilmore) EMU Meeting
... Uses gold-plated traces - solves soldering problems that plagued Rev4 boards. ...
... Uses gold-plated traces - solves soldering problems that plagued Rev4 boards. ...
Thermal state of the lithosphere in the Danube Basin and its relation
... both of the lithosphere structure and of various theories of the CarpathianPannonian region tectonic evolution in relation to the geothermal data. Both the terrestrial heat flow and the temperature distributions provide the basic information on the geothermal processes at depth. The present lithosphe ...
... both of the lithosphere structure and of various theories of the CarpathianPannonian region tectonic evolution in relation to the geothermal data. Both the terrestrial heat flow and the temperature distributions provide the basic information on the geothermal processes at depth. The present lithosphe ...
Crust and Upper Mantle Velocity Structure of the Yellowstone Hot
... velocity layer emplaced beneath the thin lithosphere. To constrain the absolute seismic velocity of the plate-sheared plume layer, fundamental mode Rayleigh wave observations have been inverted for phase velocity using the two plane wave technique. The resulting phase velocity models are inverted wi ...
... velocity layer emplaced beneath the thin lithosphere. To constrain the absolute seismic velocity of the plate-sheared plume layer, fundamental mode Rayleigh wave observations have been inverted for phase velocity using the two plane wave technique. The resulting phase velocity models are inverted wi ...
Crustal geophysical research helps constrain the nature of mantle
... 2.1.2. Velocity Structure of Igneous Provinces Most existing melting models assume that, once mantle melts, the magma rises through the lithosphere and is eventually emplaced to form igneous crust. The crustal volume, as well as the physical properties of the igneous rocks produced, depend on the te ...
... 2.1.2. Velocity Structure of Igneous Provinces Most existing melting models assume that, once mantle melts, the magma rises through the lithosphere and is eventually emplaced to form igneous crust. The crustal volume, as well as the physical properties of the igneous rocks produced, depend on the te ...
lesson 1 - sciencecafe
... magma comes to the surface and volcanoes can occur. 6. Explain that there are some volcanoes that occur in the interior of plates and not at plate boundaries. They occur over hot spots in the plates. Scientists do not know exactly why hot spots develop, but hot spots are places in the Earths inte ...
... magma comes to the surface and volcanoes can occur. 6. Explain that there are some volcanoes that occur in the interior of plates and not at plate boundaries. They occur over hot spots in the plates. Scientists do not know exactly why hot spots develop, but hot spots are places in the Earths inte ...
A Geoelectric Model of the Cascadia Subduction Zone
... Fig. 2. Evidence of recent tectonic processes [Romanyuk et al., 2001b]: (1) accretionary complex; (2) crustal seismicity; (3) Quaternary volcanic rocks; (4) depth to the Benioff zone (in km). ...
... Fig. 2. Evidence of recent tectonic processes [Romanyuk et al., 2001b]: (1) accretionary complex; (2) crustal seismicity; (3) Quaternary volcanic rocks; (4) depth to the Benioff zone (in km). ...
Upper mantle structure beneath the eastern Colorado Plateau and
... Plateau is underlain by a low-density upper mantle province that does not trend along upper crustal tectonic boundaries but, rather, is correlated with regions of middle to late Tertiary magmatism. We model uppermost mantle density contrasts using Bouguer gravity along five parallel profiles across ...
... Plateau is underlain by a low-density upper mantle province that does not trend along upper crustal tectonic boundaries but, rather, is correlated with regions of middle to late Tertiary magmatism. We model uppermost mantle density contrasts using Bouguer gravity along five parallel profiles across ...
Upper mantle structure beneath the eastern Colorado Plateau and
... Plateau is underlain by a low-density upper mantle province that does not trend along upper crustal tectonic boundaries but, rather, is correlated with regions of middle to late Tertiary magmatism. We model uppermost mantle density contrasts using Bouguer gravity along five parallel profiles across ...
... Plateau is underlain by a low-density upper mantle province that does not trend along upper crustal tectonic boundaries but, rather, is correlated with regions of middle to late Tertiary magmatism. We model uppermost mantle density contrasts using Bouguer gravity along five parallel profiles across ...
The African Plate: A history of oceanic crust accretion and
... link between the evolution of one of the largest tectonic plates, the African plate (Fig. 1), and its continental interior at times when important tectonic changes have been recorded. In Section 4, a new model for the evolution of the African plate boundaries from the Jurassic to Present is used to ...
... link between the evolution of one of the largest tectonic plates, the African plate (Fig. 1), and its continental interior at times when important tectonic changes have been recorded. In Section 4, a new model for the evolution of the African plate boundaries from the Jurassic to Present is used to ...
Are the Earth and the Moon compositionally alike? Inferences on
... [7] The inverse method employed here is general and provides through the unified description of phase equilibria a way of constructing planetary models where the radial variation of mineralogy and density with pressure and temperature is naturally specified, allowing us to directly invert for chemic ...
... [7] The inverse method employed here is general and provides through the unified description of phase equilibria a way of constructing planetary models where the radial variation of mineralogy and density with pressure and temperature is naturally specified, allowing us to directly invert for chemic ...
Canada`s craton: A bottoms-up view
... Canada is centered over a large craton and has the largest proportion of Archean crust in the world exposed at its surface, making it the focus of diamond exploration in the past 15 years. A significant portion of the Lithoprobe program was devoted to the geophysical imaging of lithosphere beneath t ...
... Canada is centered over a large craton and has the largest proportion of Archean crust in the world exposed at its surface, making it the focus of diamond exploration in the past 15 years. A significant portion of the Lithoprobe program was devoted to the geophysical imaging of lithosphere beneath t ...
Lightweight Ribs for the Strengthening of Single Leaf Vaults
... subjected to pronounced differential deflections due to the unconstrained rocking motion of the abutments and to the horizontal loads distributed along the vault crown (Fig. 1a). It is worth noting that, whether the rocking mechanism can be inhibited or confined, for example by adopting a roof box s ...
... subjected to pronounced differential deflections due to the unconstrained rocking motion of the abutments and to the horizontal loads distributed along the vault crown (Fig. 1a). It is worth noting that, whether the rocking mechanism can be inhibited or confined, for example by adopting a roof box s ...
PALAEOMAGNETISM, PLATE MOTION AND POLAR WANDER
... Remagnetization is now accepted as a widespread phenomenon, particularly in sedimentary rocks, and the problem increases with rock age. Another complicating factor is that it is not always certain whether the geomagnetic field at any given time in the past was of normal or reversed polarity (i.e. wh ...
... Remagnetization is now accepted as a widespread phenomenon, particularly in sedimentary rocks, and the problem increases with rock age. Another complicating factor is that it is not always certain whether the geomagnetic field at any given time in the past was of normal or reversed polarity (i.e. wh ...
Performance of Shear Wall Building at Various Positions by
... land area of our country is susceptible to damaging levels of seismic hazard. We can’t avoid future earthquakes, but 2.1 Pushover Analysis Nonlinear static analysis, or pushover analysis, has safe building construction practices can certainly reduce the extent of damage and loss. To evaluate the per ...
... land area of our country is susceptible to damaging levels of seismic hazard. We can’t avoid future earthquakes, but 2.1 Pushover Analysis Nonlinear static analysis, or pushover analysis, has safe building construction practices can certainly reduce the extent of damage and loss. To evaluate the per ...
Elastic Block Modeling of Fault Slip Rates across Southern California
... The fault slip rate is an important metric for understanding the activity of a fault. Slip rate is the rate at which one side of a fault moves with respect to the other. It would be the rate of motion of points along the fault boundary if the fault were slipping continuously. For example, a slip rat ...
... The fault slip rate is an important metric for understanding the activity of a fault. Slip rate is the rate at which one side of a fault moves with respect to the other. It would be the rate of motion of points along the fault boundary if the fault were slipping continuously. For example, a slip rat ...
nature of diamond - Geological Sciences, CMU
... degrees Celsius. This magnitude of high pressure is difficult to comprehend. For example, to make a diamond at 1400 degrees C (orange hot) would require the pressure of 55,000 atmospheres! Experiments and the high density of diamonds tell us that they crystallize at very high pressures. In nature t ...
... degrees Celsius. This magnitude of high pressure is difficult to comprehend. For example, to make a diamond at 1400 degrees C (orange hot) would require the pressure of 55,000 atmospheres! Experiments and the high density of diamonds tell us that they crystallize at very high pressures. In nature t ...
Seismic Strengthening of Masonry Buildings
... The first strengthening technique tested was the substitution of the original floor by a concrete slab with 0,20m of thickness. This solution has the advantage to guarantee the stiff diaphragm property and therefore distribute the forces in an effective way to the resistant walls. Nevertheless it is ...
... The first strengthening technique tested was the substitution of the original floor by a concrete slab with 0,20m of thickness. This solution has the advantage to guarantee the stiff diaphragm property and therefore distribute the forces in an effective way to the resistant walls. Nevertheless it is ...
Finite difference modelling of the full acoustic wave equation in Matlab
... choose spatial sampling to avoid grid dispersion, and then chose temporal sampling to avoid numerical instability (Kelly and Marfurt, 1990, Mufti, 1990, as discussed in Lines et al. 1999). Here, we look specifically at the parameters used to model the Marmousi dataset, with velocities varying betwee ...
... choose spatial sampling to avoid grid dispersion, and then chose temporal sampling to avoid numerical instability (Kelly and Marfurt, 1990, Mufti, 1990, as discussed in Lines et al. 1999). Here, we look specifically at the parameters used to model the Marmousi dataset, with velocities varying betwee ...
Earthscope
Earthscope is an earth science program using geological and geophysical techniques to explore the structure and evolution of the North American continent and to understand the processes controlling earthquakes and volcanoes. The project has three components: USARRAY, the Plate Boundary Observatory, and the San Andreas Fault Observatory at Depth.The project is funded by the National Science Foundation (NSF), and the data produced is publicly accessible in real-time. Organizations associated with the project include UNAVCO, the Incorporated Research Institutions for Seismology (IRIS), Stanford University, the United States Geological Survey (USGS) and National Aeronautics and Space Administration (NASA). Several international organizations also contribute to the initiative.