A method of inferring changes in deep ocean currents from
... 3. How Well Should This Method Work? [18] The accuracy with which this method can be used to infer changes in currents at 2 km depth, depends on three factors: (1) whether changes in bottom pressure differ significantly or not from changes in pressure at 2 km depth; (2) whether changes in the curre ...
... 3. How Well Should This Method Work? [18] The accuracy with which this method can be used to infer changes in currents at 2 km depth, depends on three factors: (1) whether changes in bottom pressure differ significantly or not from changes in pressure at 2 km depth; (2) whether changes in the curre ...
Regional anomalies of sediment thickness, basement depth and
... of water depths from Smith and Sandwell[2] to determine adjusted basement depth. We next corrected for expected variations in unloaded basement depth predicted by a model of conductive cooling of the underlying lithosphere as a function of its age, again assuming local isostasy. We first produced a ...
... of water depths from Smith and Sandwell[2] to determine adjusted basement depth. We next corrected for expected variations in unloaded basement depth predicted by a model of conductive cooling of the underlying lithosphere as a function of its age, again assuming local isostasy. We first produced a ...
Variable seasonal coupling between air and ground temperatures: A
... been observed and archived for much longer periods and with much greater regional coverage than have subsurface temperature observations. With this simple representation of meteorological effects one can numerically simulate subsurface temperatures over the entire archival period, and therefore inve ...
... been observed and archived for much longer periods and with much greater regional coverage than have subsurface temperature observations. With this simple representation of meteorological effects one can numerically simulate subsurface temperatures over the entire archival period, and therefore inve ...
seismic activity, Yangtze River – Yellow Sea seismic belt, trend
... each seismic period, their seismicity level, and similarities and differences among the seismic activities in different periods; (b) characteristics of the spatial distribution of different seismic periods; (c) correlations (especially the sequential relationship) among seismic activities in differe ...
... each seismic period, their seismicity level, and similarities and differences among the seismic activities in different periods; (b) characteristics of the spatial distribution of different seismic periods; (c) correlations (especially the sequential relationship) among seismic activities in differe ...
Science Article PDF - Geological Society of America
... provinces (Fuchs and Müller, 1971), and twodimensional ray-tracing and travel-time inversion to estimate two-dimensional crust and upper mantle structure from all shots (Luetgert, 1992; Zelt and Smith, 1992). Due to large distances between shotpoints (~400–600 km) travel-time modeling concentrated o ...
... provinces (Fuchs and Müller, 1971), and twodimensional ray-tracing and travel-time inversion to estimate two-dimensional crust and upper mantle structure from all shots (Luetgert, 1992; Zelt and Smith, 1992). Due to large distances between shotpoints (~400–600 km) travel-time modeling concentrated o ...
Discovery of a magma chamber and faults beneath a Mid
... Crust at slow-spreading ridges is formed by a combination of magmatic and tectonic processes, with magmatic accretion possibly involving short-lived crustal magma chambers1. The reflections of seismic waves from crustal magma chambers have been observed beneath intermediate2,3 and fast-spreading cen ...
... Crust at slow-spreading ridges is formed by a combination of magmatic and tectonic processes, with magmatic accretion possibly involving short-lived crustal magma chambers1. The reflections of seismic waves from crustal magma chambers have been observed beneath intermediate2,3 and fast-spreading cen ...
Age, spreading rates, and spreading asymmetry of the world`s ocean
... accretion rates of conjugate plates (Fig. 3b) can be computed by linear interpolation along isochrons and gridding, following the same methodology as that used for gridding isochron ages. In areas where only one of two ridge flanks is preserved, computed spreading asymmetries correspond to local dev ...
... accretion rates of conjugate plates (Fig. 3b) can be computed by linear interpolation along isochrons and gridding, following the same methodology as that used for gridding isochron ages. In areas where only one of two ridge flanks is preserved, computed spreading asymmetries correspond to local dev ...
Stress-dependent power-law flow in the upper mantle following the
... glacier melting in southeast Alaska also supports this lithospheric thickness [20]. Thus, observed far-field ...
... glacier melting in southeast Alaska also supports this lithospheric thickness [20]. Thus, observed far-field ...
analysis of deep Earth seismic waves
... scattered crustal P-wave travel times than about genuine layering in the crust. Nonetheless crustal refraction studies often do show genuinely different characteristics in the upper and lower crust. There is also often evidence for a low-velocity layer in the upper crust. • Conrad (1923) postulated ...
... scattered crustal P-wave travel times than about genuine layering in the crust. Nonetheless crustal refraction studies often do show genuinely different characteristics in the upper and lower crust. There is also often evidence for a low-velocity layer in the upper crust. • Conrad (1923) postulated ...
The Yellowstone magmatic system from the mantle plume to the
... Imaging the position and size of the entire volcanic plumbing system is also important to constrain magmatic dynamics modeling for further hazard assessment (14). Many local seismic array experiments have been conducted on volcanoes such as Askja, Iceland (15); Axial, Juan de Fuca mid-ocean ridge (1 ...
... Imaging the position and size of the entire volcanic plumbing system is also important to constrain magmatic dynamics modeling for further hazard assessment (14). Many local seismic array experiments have been conducted on volcanoes such as Askja, Iceland (15); Axial, Juan de Fuca mid-ocean ridge (1 ...
measured and predicted seismic response of two similar buildings
... built with the only difference that in building #3 (B3) a base isolation system was installed while the other similar building #2 (B2) has a rigid traditional foundation (Stuardi, 2003). Both structures were instrumented in 2005 and since then, a data acquisition system has been obtaining informatio ...
... built with the only difference that in building #3 (B3) a base isolation system was installed while the other similar building #2 (B2) has a rigid traditional foundation (Stuardi, 2003). Both structures were instrumented in 2005 and since then, a data acquisition system has been obtaining informatio ...
ppt
... ‘clumps’ found in the sub-millimetre to Bonnor Ebert spheres. The cumulative mass distribution of the sub-millimetre clumps is shown to be dominated by low-mass clumps, with a slope similar to that of the stellar Initial Mass Function. We also demonstrate that the sub-millimetre clumping is only fou ...
... ‘clumps’ found in the sub-millimetre to Bonnor Ebert spheres. The cumulative mass distribution of the sub-millimetre clumps is shown to be dominated by low-mass clumps, with a slope similar to that of the stellar Initial Mass Function. We also demonstrate that the sub-millimetre clumping is only fou ...
Possible causes for structural variation where the New Hebrides
... rocks. The subducted top of the north ridge of the DEZ can be traced beneath the accretionary wedge. Strata forming this wedge could be uplifted remnants of a wedge that predated collision, or they could have been accreted from rocks that form the ridge crest. Large slope anticlines and major vertic ...
... rocks. The subducted top of the north ridge of the DEZ can be traced beneath the accretionary wedge. Strata forming this wedge could be uplifted remnants of a wedge that predated collision, or they could have been accreted from rocks that form the ridge crest. Large slope anticlines and major vertic ...
Intermediate-Depth Earthquakes in a Region of Continental
... plained by lithospheric thickening below the center of convergence by means of a vertical downwelling (Stern et al., 2000; Pysklywec et al., 2002), although lateral shear strain is also a significant component of plate motion. Kinematic lithospheric deformation simulations predict crustal thickening ...
... plained by lithospheric thickening below the center of convergence by means of a vertical downwelling (Stern et al., 2000; Pysklywec et al., 2002), although lateral shear strain is also a significant component of plate motion. Kinematic lithospheric deformation simulations predict crustal thickening ...
Earthquake response analysis of reactor vessel internals for next
... obtained by fitting the frequency characteristics of the impedance function at a reference natural frequency value ω0, as indicated in literature [9]. The effect of settlements on the structure is usually ignored even then when differential settlements are important. A proper mathematical model of t ...
... obtained by fitting the frequency characteristics of the impedance function at a reference natural frequency value ω0, as indicated in literature [9]. The effect of settlements on the structure is usually ignored even then when differential settlements are important. A proper mathematical model of t ...
Propagation of ULF waves through the ionosphere: Inductive effect
... magnetic fields are described. Analytic expressions for the electric and magnetic wave fields in the magnetosphere, ionosphere and atmosphere are derived within the context of an inductive ionosphere. The inductive shielding effect (ISE) arises from the generation of an “inductive” rotational curren ...
... magnetic fields are described. Analytic expressions for the electric and magnetic wave fields in the magnetosphere, ionosphere and atmosphere are derived within the context of an inductive ionosphere. The inductive shielding effect (ISE) arises from the generation of an “inductive” rotational curren ...
univERsity oF copEnhAGEn
... central Iceland thinning to 30 km in the eastern and northern areas and to 20–25 km in the western and southern areas. This model is supported by the presence of deep seismic reflectors at 20–40 km depth (Gebrande et al., 1980; Bjarnason et al., 1993), which are commonly interpreted as the Moho (Men ...
... central Iceland thinning to 30 km in the eastern and northern areas and to 20–25 km in the western and southern areas. This model is supported by the presence of deep seismic reflectors at 20–40 km depth (Gebrande et al., 1980; Bjarnason et al., 1993), which are commonly interpreted as the Moho (Men ...
Inverse Problems of Seismology (Structural
... limitations regarding the cross-section as well as the relationship between various parameters. To be found: a set of cross-sections which are in agreement with the given data allowing for their precision. The above formulation of the problem is evident but not quite usual. In common practice, a sin ...
... limitations regarding the cross-section as well as the relationship between various parameters. To be found: a set of cross-sections which are in agreement with the given data allowing for their precision. The above formulation of the problem is evident but not quite usual. In common practice, a sin ...
Seismotectonic Study of the Ain Temouchent Region in North Western...
... (BENOUAR, 1994). Only a few seismic events have been reported in the region during the twentieth century. During the last twenty years, we can outline as more important three events that occurred in the vicinity of the epicenter of the Ain Temouchent event. These are the events of 16.01.1980 (Io = V ...
... (BENOUAR, 1994). Only a few seismic events have been reported in the region during the twentieth century. During the last twenty years, we can outline as more important three events that occurred in the vicinity of the epicenter of the Ain Temouchent event. These are the events of 16.01.1980 (Io = V ...
Magnetotellurics
Magnetotellurics (MT) is an electromagnetic geophysical method for inferring the earth's subsurface electrical conductivity from measurements of natural geomagnetic and geoelectric field variation at the Earth's surface. Investigation depth ranges from 300m below ground by recording higher frequencies down to 10,000m or deeper with long-period soundings. Developed in the USSR and France during the 1950s, MT is now an international academic discipline and is used in exploration surveys around the world. Commercial uses include hydrocarbon (oil and gas) exploration, geothermal exploration, mining exploration, as well as hydrocarbon and groundwater monitoring. Research applications include experimentation to further develop the MT technique, long-period deep crustal exploration, and earthquake precursor prediction research.