Seismic crustal structure between the Transylvanian
... activities of this project seek to better understand the tectonic processes responsible for the strong intermediate-depth seismicity, and to reduce the risk by applying appropriate techniques from civil engineering (e.g. Wenzel et al., 1998a). Two major active-source seismic refraction experiments w ...
... activities of this project seek to better understand the tectonic processes responsible for the strong intermediate-depth seismicity, and to reduce the risk by applying appropriate techniques from civil engineering (e.g. Wenzel et al., 1998a). Two major active-source seismic refraction experiments w ...
Influence of twin boundary orientation on SiC Linköping University Post Print
... The enhancement or suppression of MR can be explained by considering the structure of TBs in Fig. 1. The single TB is always decorated with branches like a fir tree which also are TBs. For example, in samples with parallel TBs the carriers in a magnetic field are bent from the path along the sample ...
... The enhancement or suppression of MR can be explained by considering the structure of TBs in Fig. 1. The single TB is always decorated with branches like a fir tree which also are TBs. For example, in samples with parallel TBs the carriers in a magnetic field are bent from the path along the sample ...
Mantle plumes and dynamics of the Earth interior — towards a new
... been of increasing concern of geologists and geophysicists over the last years, partly because modern seismic methods have been developed: reflection seismic surveys and tomographic experiments. The former method, applied at prolonged recording time, enables obtaining reliable images of tectonic str ...
... been of increasing concern of geologists and geophysicists over the last years, partly because modern seismic methods have been developed: reflection seismic surveys and tomographic experiments. The former method, applied at prolonged recording time, enables obtaining reliable images of tectonic str ...
Upper mantle anisotropy beneath Australia and Tahiti from P
... permanent stations installed in Tahiti (French Polynesia) in the same seismic vault (The Geoscope/CEA broadband station PPT and the LDG/CEA long-period station PPTL). All sensors have a flat instrumental response for horizontal and vertical components in the frequency range we are realizing Ppol mea ...
... permanent stations installed in Tahiti (French Polynesia) in the same seismic vault (The Geoscope/CEA broadband station PPT and the LDG/CEA long-period station PPTL). All sensors have a flat instrumental response for horizontal and vertical components in the frequency range we are realizing Ppol mea ...
Lithosphere structure underneath the Tibetan Plateau inferred from
... divided into a number of bodies with different material properties: thermal conductivity, radiogenic heat production (which can vary with depth), and density (which can vary with pressure and temperature). The top and bottom of the model correspond to the Earth's surface and the lithosphere-asthenos ...
... divided into a number of bodies with different material properties: thermal conductivity, radiogenic heat production (which can vary with depth), and density (which can vary with pressure and temperature). The top and bottom of the model correspond to the Earth's surface and the lithosphere-asthenos ...
On the origin of the asthenosphere
... that the majority of the upper mantle has modest radial anisotropy characterized by (VSH − VSV)/〈VS〉 > 0 (VSH: velocity of horizontally polarized shear wave, VSV: velocity of vertically polarized shear wave, 〈VS〉: average shear wave velocity) and the strength of radial anisotropy generally decreases ...
... that the majority of the upper mantle has modest radial anisotropy characterized by (VSH − VSV)/〈VS〉 > 0 (VSH: velocity of horizontally polarized shear wave, VSV: velocity of vertically polarized shear wave, 〈VS〉: average shear wave velocity) and the strength of radial anisotropy generally decreases ...
Dent Group and its equivalent in the offshore Kinabatangan area
... In the offshore Kinabatangan area, the sedimentary succession unit was also called as "formation" by the previous operator. The names of the offshore rock formation followed what were believed to be the equivalents to the onshore geological formations in the Dent Peninsula. However, due to the combi ...
... In the offshore Kinabatangan area, the sedimentary succession unit was also called as "formation" by the previous operator. The names of the offshore rock formation followed what were believed to be the equivalents to the onshore geological formations in the Dent Peninsula. However, due to the combi ...
Geological Society, London, Special Publications
... translate the 256 levels of recorded side-scan sonar information into 16 grey shades have been produced following corrections for changes in system gain. Survey lines were generally run at 45 ~to the strike of the seafloor fabric to optimize the use of the side-scan sonar. Navigation consisted of GP ...
... translate the 256 levels of recorded side-scan sonar information into 16 grey shades have been produced following corrections for changes in system gain. Survey lines were generally run at 45 ~to the strike of the seafloor fabric to optimize the use of the side-scan sonar. Navigation consisted of GP ...
The Hawaiian SWELL Pilot Experiment
... for this is that the lateral resolution of structure around Hawaii is rather poor, due to the lack of permanent broadband seismic stations. Regional body wave tomography using temporary deployments of broadband arrays have come a long way to image plume–like features on land (e.g. Wolfe et al, 1997; ...
... for this is that the lateral resolution of structure around Hawaii is rather poor, due to the lack of permanent broadband seismic stations. Regional body wave tomography using temporary deployments of broadband arrays have come a long way to image plume–like features on land (e.g. Wolfe et al, 1997; ...
A rare great earthquake on an oceanic fossil
... earthquake. In common with other strike-slip earthquakes studied in the same fashion, the mantle wave data indicates that there are two pure-double couple constrained solutions, along with a range of mechanisms between them, that fit the data almost equally well. Aftershocks relocated for this study ...
... earthquake. In common with other strike-slip earthquakes studied in the same fashion, the mantle wave data indicates that there are two pure-double couple constrained solutions, along with a range of mechanisms between them, that fit the data almost equally well. Aftershocks relocated for this study ...
Constraining the extent of crust–mantle coupling in central Asia
... the mantle align with the left-lateral maximum shear directions in the crustal deformation field in Tibet, but are not in Yunnan. Our results have the following implications. First, the coherence between crust and mantle deformation in Tibet implies strong crust–mantle mechanical coupling, since thi ...
... the mantle align with the left-lateral maximum shear directions in the crustal deformation field in Tibet, but are not in Yunnan. Our results have the following implications. First, the coherence between crust and mantle deformation in Tibet implies strong crust–mantle mechanical coupling, since thi ...
Constructing new seismograms from old earthquakes: Retrospective
... 1 School of GeoSciences, University of Edinburgh, Edinburgh, UK, 2 British Geological Survey, Edinburgh, UK ...
... 1 School of GeoSciences, University of Edinburgh, Edinburgh, UK, 2 British Geological Survey, Edinburgh, UK ...
Seismology - Università degli studi di Trieste
... several seismic phases on a number of stations, compute distribution of velocity, density and attenuation coefficient with depth, and positions of all discontinuities. This is very difficult and often does not give a unique solution. Instead, a range of solutions is offered, each with its own probab ...
... several seismic phases on a number of stations, compute distribution of velocity, density and attenuation coefficient with depth, and positions of all discontinuities. This is very difficult and often does not give a unique solution. Instead, a range of solutions is offered, each with its own probab ...
Exploring the seismic expression of fault zones in 3D
... inferred to represent a thrust fault, is surrounded by a halo characterized by low amplitude and incoherent seismic traces (the square box b Fig. 3a, b). The same characteristics are retained even after smoothing (Fig. 3c). This part of the seismic volume represents a width of several 10e100 m (see ...
... inferred to represent a thrust fault, is surrounded by a halo characterized by low amplitude and incoherent seismic traces (the square box b Fig. 3a, b). The same characteristics are retained even after smoothing (Fig. 3c). This part of the seismic volume represents a width of several 10e100 m (see ...
Three-dimensional seismic anisotropy in the crust and uppermost
... that should worsen the accuracy of their locations. At the same time, as was shown by Koulakov [2009a], adding out-of-network events improves the ray coverage beneath stations, increases the number of data, and thus enhances the resolution of the tomography model. Although the mislocations for such ...
... that should worsen the accuracy of their locations. At the same time, as was shown by Koulakov [2009a], adding out-of-network events improves the ray coverage beneath stations, increases the number of data, and thus enhances the resolution of the tomography model. Although the mislocations for such ...
crustal velocity structure of the rukwa rift in the western
... depth. The Moho is placed where there is a strong velocity discontinuity marked by a Vs increase to between 4.4 and 4.7 km/sec (Figure 4). The uncertainty in the Moho depth estimate is ± 2 km, which arises primarily from the use of 2 km thick layers in the model and the influence of the starting mod ...
... depth. The Moho is placed where there is a strong velocity discontinuity marked by a Vs increase to between 4.4 and 4.7 km/sec (Figure 4). The uncertainty in the Moho depth estimate is ± 2 km, which arises primarily from the use of 2 km thick layers in the model and the influence of the starting mod ...
Gravity anomalies, crustal structure and thermo
... flexural support of the range; (2) a steep gravity gradient of the order of 1.3 mgal kmx1 beneath the Higher Himalaya, suggesting a locally steeper Moho; and (3) a 10 km wide hinge in southern Tibet. We compare these data with a 2-D mechanical model in which the Indian lithosphere is flexed down by ...
... flexural support of the range; (2) a steep gravity gradient of the order of 1.3 mgal kmx1 beneath the Higher Himalaya, suggesting a locally steeper Moho; and (3) a 10 km wide hinge in southern Tibet. We compare these data with a 2-D mechanical model in which the Indian lithosphere is flexed down by ...
Originally published as: Ivanova, A., Kashubin, A
... The traveltime difference map (Fig. 7, right panel) shows increased time delays due to reduced velocities in the gas-saturated reservoir between the K2 horizon and a picked reflection below the reservoir (about 160 ms below K2). These delays of up to 4-5 ms are concentrated mostly in the vicinity of ...
... The traveltime difference map (Fig. 7, right panel) shows increased time delays due to reduced velocities in the gas-saturated reservoir between the K2 horizon and a picked reflection below the reservoir (about 160 ms below K2). These delays of up to 4-5 ms are concentrated mostly in the vicinity of ...
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.