Upper mantle anisotropy beneath Australia and Tahiti from P
... Polynésien de Prévention des Tsunamis (CPPT) in French Polynesia, which operates by automatic detection, location and quantification of the magnitude of large earthquakes using both P wave polarization direction and the time difference between P and S waves. We will show that Ppol method could be ...
... Polynésien de Prévention des Tsunamis (CPPT) in French Polynesia, which operates by automatic detection, location and quantification of the magnitude of large earthquakes using both P wave polarization direction and the time difference between P and S waves. We will show that Ppol method could be ...
Foundering of lower island-arc crust as an explanation for the origin
... arc crust is generally less dense than the underlying upper mantle peridotites (‘density stable’)13,14, whereas in Kohistan lower-crustal rocks denser than the upper-mantle peridotites (‘density unstable’) are preserved15. Here we present thermodynamic modelling of observed crustal compositions at p ...
... arc crust is generally less dense than the underlying upper mantle peridotites (‘density stable’)13,14, whereas in Kohistan lower-crustal rocks denser than the upper-mantle peridotites (‘density unstable’) are preserved15. Here we present thermodynamic modelling of observed crustal compositions at p ...
Australian Journal of Earth Sciences Structure of the Tasmanian
... which requires the solution of a large inverse problem to build heterogeneous models of the Earth’s interior that are consistent with observations made from seismic records. From its origins in the mid-late 1970s (Aki & Lee 1976; Aki et al. 1977; Dziewonski et al. 1977), it has developed into a matu ...
... which requires the solution of a large inverse problem to build heterogeneous models of the Earth’s interior that are consistent with observations made from seismic records. From its origins in the mid-late 1970s (Aki & Lee 1976; Aki et al. 1977; Dziewonski et al. 1977), it has developed into a matu ...
possible models of the deepest part of the larderello geothermal field
... a depth greater than 20 km. 3.4 Conductivity structure A recent magnetotelluric (MT) survey revealed the presence of a large conductive body below Larderello geothermal field (Fiordelisi et 1994). The MT data were the first to provide a detailed definition of the conductivity structure at great dept ...
... a depth greater than 20 km. 3.4 Conductivity structure A recent magnetotelluric (MT) survey revealed the presence of a large conductive body below Larderello geothermal field (Fiordelisi et 1994). The MT data were the first to provide a detailed definition of the conductivity structure at great dept ...
Geological Structure and Time-Lapse Studies of CO2 Injection
... 3D seismic time-lapse surveys (“4D seismics”) are an essential tool for large scale reservoir characterization. The target reservoir of the Ketzin pilot project for CO2 storage is a saline aquifer of the heterogeneous Stuttgart Formation (Upper Triassic) in the Northeast German Basin. The focus of t ...
... 3D seismic time-lapse surveys (“4D seismics”) are an essential tool for large scale reservoir characterization. The target reservoir of the Ketzin pilot project for CO2 storage is a saline aquifer of the heterogeneous Stuttgart Formation (Upper Triassic) in the Northeast German Basin. The focus of t ...
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... Barss, 1975; Bradley, 1982) have been based mainly on on shore field observations and scant offshore data, and give an incomplete view of its stratigraphy and structural setting. Pre vious seismic studies in the Gulf of St. Lawrence focused on sedimentary infill (e g., Grant and Moir, 1992), basem ...
... Barss, 1975; Bradley, 1982) have been based mainly on on shore field observations and scant offshore data, and give an incomplete view of its stratigraphy and structural setting. Pre vious seismic studies in the Gulf of St. Lawrence focused on sedimentary infill (e g., Grant and Moir, 1992), basem ...
Interrelationship between small strain modulus G0 and operative
... soil (by the weight of the truck) and oriented with its long axis parallel to the axis of the receivers, so that they can offer the highest sensitivity to the generated shear wave. The determination of the delay from SDMT seismograms, normally carried out using the crosscorrelation algorithm, is gen ...
... soil (by the weight of the truck) and oriented with its long axis parallel to the axis of the receivers, so that they can offer the highest sensitivity to the generated shear wave. The determination of the delay from SDMT seismograms, normally carried out using the crosscorrelation algorithm, is gen ...
A seismic discontinuity in the upper mantle between the Eastern
... mantle refractors or reflectors in active source data enables challenging and interesting studies of the lower and not so well known part of the lithosphere. We present such an example from the tectonically complex region between the Eastern Alps and the Western Carpathians. This area was covered by ...
... mantle refractors or reflectors in active source data enables challenging and interesting studies of the lower and not so well known part of the lithosphere. We present such an example from the tectonically complex region between the Eastern Alps and the Western Carpathians. This area was covered by ...
Complex seismic trace analysis and its application to time
... be used to study low-frequency shadow commonly observed under hydrocarbon reservoirs (Taner, 1977 and 1979). Both instantaneous phase and frequency may change in response to interference. With the aid of instantaneous phase and frequency, the envelope of instantaneous amplitude can give more insight ...
... be used to study low-frequency shadow commonly observed under hydrocarbon reservoirs (Taner, 1977 and 1979). Both instantaneous phase and frequency may change in response to interference. With the aid of instantaneous phase and frequency, the envelope of instantaneous amplitude can give more insight ...
Mid-Continent Earthq..
... earthquakes are so infrequent, we do not have many historical records, and patterns are not well understood Past large earthquakes indicate where more earthquakes will occur; this leads to underestimation of hazards elsewhere ...
... earthquakes are so infrequent, we do not have many historical records, and patterns are not well understood Past large earthquakes indicate where more earthquakes will occur; this leads to underestimation of hazards elsewhere ...
Crustal magma plumbing within a segment of the Mid
... also show the contrast between the unattenuated arrivals at the southern end of the study area (Fig. 2b) and the attenuated arrivals for ray paths traveling though the lower crust in the segment center (Fig. 2a). The Pg data provide three-dimensional ray coverage down to depths of 5.5 km below the s ...
... also show the contrast between the unattenuated arrivals at the southern end of the study area (Fig. 2b) and the attenuated arrivals for ray paths traveling though the lower crust in the segment center (Fig. 2a). The Pg data provide three-dimensional ray coverage down to depths of 5.5 km below the s ...
The role of crustal fluids in the tectonic evolution of... Province of the Archaean Yilgarn Craton, Western Australia
... supracrustal rocks by fluids migrating up crustal scale fault zones. Regional ENE-WSW D2 shortening of the supracrustal rocks was detached from lower crustal shortening at a regional sub-horizontal detachment surface which transects stratigraphy below the base of the greenstones. Major gold deposits ...
... supracrustal rocks by fluids migrating up crustal scale fault zones. Regional ENE-WSW D2 shortening of the supracrustal rocks was detached from lower crustal shortening at a regional sub-horizontal detachment surface which transects stratigraphy below the base of the greenstones. Major gold deposits ...
Crustal architecture of the Capricorn Orogen, Western Australia and
... A 581 km vibroseis-source, deep seismic reflection survey was acquired through the Capricorn Orogen of Western Australia and, for the first time, provides an unprecedented view of the deep crustal architecture of the West Australian Craton. The survey has imaged three principal suture zones, as well ...
... A 581 km vibroseis-source, deep seismic reflection survey was acquired through the Capricorn Orogen of Western Australia and, for the first time, provides an unprecedented view of the deep crustal architecture of the West Australian Craton. The survey has imaged three principal suture zones, as well ...
Master`s Thesis Template
... Similar to the energy ratio similarity time slice, all faults and chaotic zones with poor data quality are well imaged on the Sobel filter similarity time slice... ......................... 24 Figure 3.3. Sobel filter similarity horizon slice extracted along the top Jurassic level horizon. Yellow ar ...
... Similar to the energy ratio similarity time slice, all faults and chaotic zones with poor data quality are well imaged on the Sobel filter similarity time slice... ......................... 24 Figure 3.3. Sobel filter similarity horizon slice extracted along the top Jurassic level horizon. Yellow ar ...
On the shaping factors of the secondary microseismic wavefield
... The amplitude of land-recorded seismic noise in relation with the source location and efficiency to transmit seismic energy from the ocean to the continent is still under debate. Evidence of dominant offshore noise sources located in deep ocean environments has been documented by Webb and Constable [19 ...
... The amplitude of land-recorded seismic noise in relation with the source location and efficiency to transmit seismic energy from the ocean to the continent is still under debate. Evidence of dominant offshore noise sources located in deep ocean environments has been documented by Webb and Constable [19 ...
DENSITY-VELOCITY RELATIONSHIP IN THE UPPER
... crust that is accompanied by a negative gravity anomaly can be attributed to anorthosites. Due to a high amount of plagioclase and CaO, these rocks have high P-wave velocity comparable with that of gabbroid rocks, while their density is significantly less (Henkel et al., 1990; Kern et al., 1993). Ho ...
... crust that is accompanied by a negative gravity anomaly can be attributed to anorthosites. Due to a high amount of plagioclase and CaO, these rocks have high P-wave velocity comparable with that of gabbroid rocks, while their density is significantly less (Henkel et al., 1990; Kern et al., 1993). Ho ...
Integrated 3D geophysical and geological modelling of the
... This paper combines geological knowledge and geophysical imagery at the crustal scale to model the 3D geometry of a segment of the Hercynian suture zone of western Europe in the Champtoceaux area (Brittany, France). The Champtoceaux complex consists of a stack of metamorphic nappes of gneisses and m ...
... This paper combines geological knowledge and geophysical imagery at the crustal scale to model the 3D geometry of a segment of the Hercynian suture zone of western Europe in the Champtoceaux area (Brittany, France). The Champtoceaux complex consists of a stack of metamorphic nappes of gneisses and m ...
south Brittany - Site de Patrick Ledru
... This paper combines geological knowledge and geophysical imagery at the crustal scale to model the 3D geometry of a segment of the Hercynian suture zone of western Europe in the Champtoceaux area (Brittany, France). The Champtoceaux complex consists of a stack of metamorphic nappes of gneisses and m ...
... This paper combines geological knowledge and geophysical imagery at the crustal scale to model the 3D geometry of a segment of the Hercynian suture zone of western Europe in the Champtoceaux area (Brittany, France). The Champtoceaux complex consists of a stack of metamorphic nappes of gneisses and m ...
Chapter 2: Seismology (part B)
... discontinuities and gradual transitions over a depth interval up to about 20 km. An exception are shortperiod precursors to the phase P KP P KP (generally termed P 0 P 0 which result from underside reflections off mantle discontinuities at near-vertical incidence – fig. 2.53, 2.54). These observatio ...
... discontinuities and gradual transitions over a depth interval up to about 20 km. An exception are shortperiod precursors to the phase P KP P KP (generally termed P 0 P 0 which result from underside reflections off mantle discontinuities at near-vertical incidence – fig. 2.53, 2.54). These observatio ...
Petrological interpretation of deep crustal intrusive bodies beneath
... or above the Moho, e.g., Hawaii, the Marquesas, and La Reunion. However, at other hotspot provinces such as the Galapagos, Nazca Ridge, and Louisville the lower crust is intruded by large volumes of gabbroic (mafic) rocks (Vp ~ 6.8–7.5 km/s). Ultramafic primary melts formed beneath mature oceanic lith ...
... or above the Moho, e.g., Hawaii, the Marquesas, and La Reunion. However, at other hotspot provinces such as the Galapagos, Nazca Ridge, and Louisville the lower crust is intruded by large volumes of gabbroic (mafic) rocks (Vp ~ 6.8–7.5 km/s). Ultramafic primary melts formed beneath mature oceanic lith ...
effects of temperature on attenuation of seismic waves through
... It is worth mentioning that the geometrical effects affecting attenuation of elastic waves, which include refraction, reflection and scattering can be thought of as resulting from boundary conditions imposed on the wave‐ ...
... It is worth mentioning that the geometrical effects affecting attenuation of elastic waves, which include refraction, reflection and scattering can be thought of as resulting from boundary conditions imposed on the wave‐ ...
Westbrook et al., (1988)
... overburden pressure for a shorter time than the rocks above and will be relatively less consolidated, with higher porosity, lower density, and lower seismic velocity. The loss of the bright reflector at 70 km could be because it is intersected by a thrust that soles out at a lower stratigraphic lev ...
... overburden pressure for a shorter time than the rocks above and will be relatively less consolidated, with higher porosity, lower density, and lower seismic velocity. The loss of the bright reflector at 70 km could be because it is intersected by a thrust that soles out at a lower stratigraphic lev ...
IEEE Transactions on Magnetics
... of P-waves in any given material. There are also some other waves which important in measuring the intensity of earthquake but not so dangerous compared to s and p waves, They are as follows: SURFACE WAVES Seismic surface waves travel along the Earth's surface. They are called surface waves, as they ...
... of P-waves in any given material. There are also some other waves which important in measuring the intensity of earthquake but not so dangerous compared to s and p waves, They are as follows: SURFACE WAVES Seismic surface waves travel along the Earth's surface. They are called surface waves, as they ...
Viscous fluid dampers
... energy is completely transferred into nearest areas from the focus with appropriate deviation. Earthquakes that happen in one place can be detected by seismographs in other. The waves from the epicenter of a major earthquake propagate outward as surface waves. In the case of compression waves, the e ...
... energy is completely transferred into nearest areas from the focus with appropriate deviation. Earthquakes that happen in one place can be detected by seismographs in other. The waves from the epicenter of a major earthquake propagate outward as surface waves. In the case of compression waves, the e ...
- Arizona State University
... Wilson and Aster (2005) to produce receiver functions with decreased sensitivity to noise and deconvolutional instability. Crustal thickness and Vp/Vs ratios are estimated using both direct and reverberated P-to-S receiver function modes. We apply regularized receiver function migration methods to p ...
... Wilson and Aster (2005) to produce receiver functions with decreased sensitivity to noise and deconvolutional instability. Crustal thickness and Vp/Vs ratios are estimated using both direct and reverberated P-to-S receiver function modes. We apply regularized receiver function migration methods to p ...
Reflection seismology
Reflection seismology (or seismic reflection) is a method of exploration geophysics that uses the principles of seismology to estimate the properties of the Earth's subsurface from reflected seismic waves. The method requires a controlled seismic source of energy, such as dynamite/Tovex, a specialized air gun or a seismic vibrator, commonly known by the trademark name Vibroseis. Reflection seismology is similar to sonar and echolocation. This article is about surface seismic surveys; for vertical seismic profiles, see VSP.