Crustal structure of the French Guiana margin
... on bathymetric, magnetic and gravity data from the Central Atlantic (Fig. 2). Segmentation is further evident in along-strike variation in the effective elastic thickness (T e —e.g. Watts & Stewart 1998), riftrelated magmatism (e.g. Callot & Geoffroy 2002; Wu et al. 2006), exhumed and serpentinized ...
... on bathymetric, magnetic and gravity data from the Central Atlantic (Fig. 2). Segmentation is further evident in along-strike variation in the effective elastic thickness (T e —e.g. Watts & Stewart 1998), riftrelated magmatism (e.g. Callot & Geoffroy 2002; Wu et al. 2006), exhumed and serpentinized ...
Spatial variation of lithospheric heterogeneity on the globe as revealed... P Mungiya Kubanza, Takeshi Nishimura, and Haruo Sato
... of the earth (e.g., Megnin and Romanowicz, 2000). Analyses of seismic coda waves have also been used to evaluate small-scale heterogeneity (e.g., Fehler et al., 1992). These analyses have resulted in detailed views of seismic structure and an accumulation of valuable data on the dynamics and evoluti ...
... of the earth (e.g., Megnin and Romanowicz, 2000). Analyses of seismic coda waves have also been used to evaluate small-scale heterogeneity (e.g., Fehler et al., 1992). These analyses have resulted in detailed views of seismic structure and an accumulation of valuable data on the dynamics and evoluti ...
Originally published as: Ivanova, A., Kashubin, A
... (Table 2) was carried out using the interpretational software package Pro4D. The crosscalibration of the two stacked seismic cubes included cross-correlation, phase and time shifting, phase and frequency shaping by filtering, cross-normalization and time-variant shifting. The quality of the seismic ...
... (Table 2) was carried out using the interpretational software package Pro4D. The crosscalibration of the two stacked seismic cubes included cross-correlation, phase and time shifting, phase and frequency shaping by filtering, cross-normalization and time-variant shifting. The quality of the seismic ...
Crustal structure of the Hatton and the conjugate east Greenland
... high-amplitude source capable of propagating long distances through the basalts, which severely attenuate high-frequency energy [Maresh and White, 2005], we deployed a 14-gun array totaling 104 L (6360 in3), towed at 20 m depth, which generated a waveform centered on 9 – 10 Hz [White et al., 2002]. ...
... high-amplitude source capable of propagating long distances through the basalts, which severely attenuate high-frequency energy [Maresh and White, 2005], we deployed a 14-gun array totaling 104 L (6360 in3), towed at 20 m depth, which generated a waveform centered on 9 – 10 Hz [White et al., 2002]. ...
Petrological interpretation of deep crustal intrusive bodies beneath
... older, thicker oceanic lithosphere must pond and undergo extensive olivine and clinopyroxene fractionation before evolving residual magmas of basaltic composition sufficiently buoyant to be erupted at the surface. A survey of well-studied hotspot provinces of highly-varying lithospheric age at the ti ...
... older, thicker oceanic lithosphere must pond and undergo extensive olivine and clinopyroxene fractionation before evolving residual magmas of basaltic composition sufficiently buoyant to be erupted at the surface. A survey of well-studied hotspot provinces of highly-varying lithospheric age at the ti ...
Factors influencing magmatism during continental break
... middle of the plateau, and the latter a coralline cay on the outer shelf. In order to ensure a common ...
... middle of the plateau, and the latter a coralline cay on the outer shelf. In order to ensure a common ...
Detailed rupture imaging of the 25 April 2015 Nepal earthquake
... can display very fast rupture speeds (Figure S4). To better constrain the possible rupture velocities, near-field seismic observations will be needed. To understand the uncertainties and robustness of the backprojection images, we have performed three types of resolution tests. First, the theoretical ...
... can display very fast rupture speeds (Figure S4). To better constrain the possible rupture velocities, near-field seismic observations will be needed. To understand the uncertainties and robustness of the backprojection images, we have performed three types of resolution tests. First, the theoretical ...
Magmatic processes at slow spreading ridges
... of oceanic crust drew heavily on observations of ophiolites, and postulated the existence of large crustal magma chambers beneath ridge axes. The importance of this concept is that a magma chamber provides a setting in which the gradual crystallization of an initially primitive melt can lead to the ...
... of oceanic crust drew heavily on observations of ophiolites, and postulated the existence of large crustal magma chambers beneath ridge axes. The importance of this concept is that a magma chamber provides a setting in which the gradual crystallization of an initially primitive melt can lead to the ...
Upper mantle and lithospheric heterogeneities in central
... to the mantle transition zone. Receiver functions provide valuable information on structural features, which are important for the resolution of European lithospheric dynamics. Moho depths vary from less than 25 km in extensional areas in central Europe to more than 50 km at stations in eastern Euro ...
... to the mantle transition zone. Receiver functions provide valuable information on structural features, which are important for the resolution of European lithospheric dynamics. Moho depths vary from less than 25 km in extensional areas in central Europe to more than 50 km at stations in eastern Euro ...
On the Accuracy of Mapping the Lateral Extent of Hydrocarbon
... set up. In these surveys one tries to figure out if the CSEM is able to detect the reservoir, and what is the optimal survey configuration for the marine CSEM set up (Kaputerko et al., 2007; Becken and Streich, 2010; Gao et al., 2007). Through studies of the anisotropic sensitivity in reservoirs (St ...
... set up. In these surveys one tries to figure out if the CSEM is able to detect the reservoir, and what is the optimal survey configuration for the marine CSEM set up (Kaputerko et al., 2007; Becken and Streich, 2010; Gao et al., 2007). Through studies of the anisotropic sensitivity in reservoirs (St ...
Physical properties of upper oceanic crust
... to guide deletion of associated unreliable density data. Approximately 21% of the data were deleted in this manner. As discussed in a subsequent section, however, interlog comparisons suggest that spurious values are common even in this edited density log. Figure 2 shows the edited density log; the ...
... to guide deletion of associated unreliable density data. Approximately 21% of the data were deleted in this manner. As discussed in a subsequent section, however, interlog comparisons suggest that spurious values are common even in this edited density log. Figure 2 shows the edited density log; the ...
The seismic cycle at subduction thrusts: 2. Dynamic implications of
... the deviatoric stress tensor components sij and gravity acceleration g, we introduce the inertial term, represented by density r times the Lagrangian time derivative of the respective velocity components Dv Dt . In this marker-in-cell formulation, density and velocity are advected with the Lagrangia ...
... the deviatoric stress tensor components sij and gravity acceleration g, we introduce the inertial term, represented by density r times the Lagrangian time derivative of the respective velocity components Dv Dt . In this marker-in-cell formulation, density and velocity are advected with the Lagrangia ...
Acquisition of the Blackfoot broad-band seismic survey
... A broad-band seismic survey undertaken by the CREWES Project was conducted in July 1995 at the Blackfoot Field, southeast of Stratmore, Alberta. This paper discusses the geometry and the equipment used during the survey. The objective of the survey was to test 2 Hz, 4.5 Hz and 10 Hz 3-component geop ...
... A broad-band seismic survey undertaken by the CREWES Project was conducted in July 1995 at the Blackfoot Field, southeast of Stratmore, Alberta. This paper discusses the geometry and the equipment used during the survey. The objective of the survey was to test 2 Hz, 4.5 Hz and 10 Hz 3-component geop ...
Westbrook et al., (1988)
... driven up the slope of the forearc basement. These sediments, therefore, act as a so-called "backstop" to the accretionary wedge, although it is clear that they are deformed where they adjoin the wedge and are incorporated within it to some degree. They may be thought of as more of a "brake" than a ...
... driven up the slope of the forearc basement. These sediments, therefore, act as a so-called "backstop" to the accretionary wedge, although it is clear that they are deformed where they adjoin the wedge and are incorporated within it to some degree. They may be thought of as more of a "brake" than a ...
Crustal structure of the central Sunda margin at the onset of oblique
... beneath the outer high off Sumatra to Sunda Strait is supported by complementary gravity modelling. The downgoing slab is traced to a depth of more than 30 km. On both reflection dip-lines, a clearly developed backstop structure underlying a trench slope break defines the landward termination of the ...
... beneath the outer high off Sumatra to Sunda Strait is supported by complementary gravity modelling. The downgoing slab is traced to a depth of more than 30 km. On both reflection dip-lines, a clearly developed backstop structure underlying a trench slope break defines the landward termination of the ...
Boundless Study Slides
... • uniform circular motion Movement around a circular path with constant speed. • wave A moving disturbance in the energy level of a field. • wave equation An important second-order linear partial differential equation for the description of waves such as sound waves, light waves, and water waves. • ...
... • uniform circular motion Movement around a circular path with constant speed. • wave A moving disturbance in the energy level of a field. • wave equation An important second-order linear partial differential equation for the description of waves such as sound waves, light waves, and water waves. • ...
To be submitted to either SDEE or BEE or SRL - EMCA-GEM
... attempt to construct a seismic zoning map, where the expected surface shaking is expressed in terms of isoseimal lines for different intensities date back to 1933 (Mushketov, 1933; Savarensky, 1968). In 1978, a general seismic zoning (GSZ) map was released for the former Soviet Union territory (Bune ...
... attempt to construct a seismic zoning map, where the expected surface shaking is expressed in terms of isoseimal lines for different intensities date back to 1933 (Mushketov, 1933; Savarensky, 1968). In 1978, a general seismic zoning (GSZ) map was released for the former Soviet Union territory (Bune ...
Source Parameters and Tectonic Implications of Aftershocks of the M
... durations on raw data files. Filtered (1-Hz low-passed) data were used to verify or modify arrival times. Phase arrivals were weighted by the picking uncertainty. Several analysts participated in phase picking, and care was taken to ensure that pick criteria were uniform and standardized. We estimat ...
... durations on raw data files. Filtered (1-Hz low-passed) data were used to verify or modify arrival times. Phase arrivals were weighted by the picking uncertainty. Several analysts participated in phase picking, and care was taken to ensure that pick criteria were uniform and standardized. We estimat ...
Electrical conductivity structure of the Alpine Fault and its
... zone or the root of the Alpine Fault beneath the seismogenic portion of the upper crust are being exhumed [Norris and Cooper, 2007]. This provides a rare opportunity to compare the results of geophysical investigations of a large active fault with material that has passed through the region of the ...
... zone or the root of the Alpine Fault beneath the seismogenic portion of the upper crust are being exhumed [Norris and Cooper, 2007]. This provides a rare opportunity to compare the results of geophysical investigations of a large active fault with material that has passed through the region of the ...
Seismic and aseismic deformation along the East African Rift
... additional data with the rigid rotation previously defined by using the F-ratio statistic (Nocquet et al. 2002, 2006). The final data set used as input in the inversion consists of 19 stations indicated on the map of the Fig. 2. We obtain a solution for the Nubia-ITRF2008 angular velocity (Table 2) ...
... additional data with the rigid rotation previously defined by using the F-ratio statistic (Nocquet et al. 2002, 2006). The final data set used as input in the inversion consists of 19 stations indicated on the map of the Fig. 2. We obtain a solution for the Nubia-ITRF2008 angular velocity (Table 2) ...
Structure and Serpentinization of the Subducting Cocos Plate
... Peninsula; HS, Hernando Scarp; FR, Fisher Ridge; QP, Quepos Plateau. The red line shows the ship track with air gun shots for line SERP. Yellow circles are the positions of OBSs used for this seismic refraction study. [7] In this study we present an analysis of marine seismic refraction data acquire ...
... Peninsula; HS, Hernando Scarp; FR, Fisher Ridge; QP, Quepos Plateau. The red line shows the ship track with air gun shots for line SERP. Yellow circles are the positions of OBSs used for this seismic refraction study. [7] In this study we present an analysis of marine seismic refraction data acquire ...
Elastic Block Modeling of Fault Slip Rates across Southern California
... directly correlated to the amount of stress built up in the earth around it. Stress data can then be used to predict earthquakes, for example. The stress around the SAF is so great that not only does it cause bending in the earth but results in many smaller faults forming in the area. Major faults a ...
... directly correlated to the amount of stress built up in the earth around it. Stress data can then be used to predict earthquakes, for example. The stress around the SAF is so great that not only does it cause bending in the earth but results in many smaller faults forming in the area. Major faults a ...
Constraints on the viscosity of the continental crust and mantle from
... viscosity of the lower crust and upper mantle. We find an upper mantle viscosity between 1 1018 and 4 1018 Pa s. The presence of such a weak mantle is consistent with results from independent seismological and petrological studies that show an abnormally hot upper mantle beneath Mongolia. The vi ...
... viscosity of the lower crust and upper mantle. We find an upper mantle viscosity between 1 1018 and 4 1018 Pa s. The presence of such a weak mantle is consistent with results from independent seismological and petrological studies that show an abnormally hot upper mantle beneath Mongolia. The vi ...
Earthquakes
... You can trace the deformation a rock has experienced by seeing how it differs from its original horizontal, oldest-onbottom position (Figure 7.2). This deformation produces geologic structures such as folds, joints, and faults that are caused by stresses (Figure 7.2). Using the rules listed above, t ...
... You can trace the deformation a rock has experienced by seeing how it differs from its original horizontal, oldest-onbottom position (Figure 7.2). This deformation produces geologic structures such as folds, joints, and faults that are caused by stresses (Figure 7.2). Using the rules listed above, t ...
Interpretation of heat-flow density in the Central Andes
... This study focuses on the interpretation of surface heat-flow density data in the central Andes to examine possible lithospheric thermal structures. Along a profile at about 21ºS from the Peru–Chile trench in the west to the Andean foreland in the east, surface heat-flow density is used to constrain ...
... This study focuses on the interpretation of surface heat-flow density data in the central Andes to examine possible lithospheric thermal structures. Along a profile at about 21ºS from the Peru–Chile trench in the west to the Andean foreland in the east, surface heat-flow density is used to constrain ...
Surface wave inversion
Inversion is the set of methods used to infer properties through physical measurements. Surface wave inversion is the method by which elastic properties, density, and thickness of layers in the subsurface are attained through analysis of surface wavedispersion. The entire inversion process requires the gathering of seismic data, the creation of dispersion curves, and finally the inference of subsurface properties.