Vector wavefields for weakly attenuating anisotropic media by the
... e.g., Futterman, 1962; Kjartansson, 1979; Mtiller, 1983) can be considered. Attenuation effects on the reflection and transmission coefficients are not taken into account. The computations based on the weak attenuation concept are reasonably fast. For the examples presented in this paper, the CPU ti ...
... e.g., Futterman, 1962; Kjartansson, 1979; Mtiller, 1983) can be considered. Attenuation effects on the reflection and transmission coefficients are not taken into account. The computations based on the weak attenuation concept are reasonably fast. For the examples presented in this paper, the CPU ti ...
Sine et al.
... Figure 2d with areas of interest labeled A – E. Notable features are the very slow P and S wave speeds in the upper 200 km beneath the GB (A) and the very sharp transition in seismic wave speed at the western edge of the CP (B) where Vp and Vs change 6% and 12% respectively over a horizontal dista ...
... Figure 2d with areas of interest labeled A – E. Notable features are the very slow P and S wave speeds in the upper 200 km beneath the GB (A) and the very sharp transition in seismic wave speed at the western edge of the CP (B) where Vp and Vs change 6% and 12% respectively over a horizontal dista ...
Tectonics, Dynamics, and Seismic Hazard in the Canada–Alaska
... between shortening and strike-slip [Ristau et al., 2007]. In contrast with the western U.S. Cordillera, there is very little evidence of present-day extension in the Canada–Alaska sections (Plate 2). In most regions, earthquake mechanisms are compatible with the widespread NE–SW orientation of princ ...
... between shortening and strike-slip [Ristau et al., 2007]. In contrast with the western U.S. Cordillera, there is very little evidence of present-day extension in the Canada–Alaska sections (Plate 2). In most regions, earthquake mechanisms are compatible with the widespread NE–SW orientation of princ ...
Seismic wave attenuation and dispersion resulting from wave
... pressure develop on the mesoscale. This drives the so-called mesoscopic fluid flow, which causes the attenuation of elastic energy and the dispersion of a propagating wave. In typical sedimentary rocks, mesoscopic flow can occur within a wide range of scales, from the largest pore size to the smalle ...
... pressure develop on the mesoscale. This drives the so-called mesoscopic fluid flow, which causes the attenuation of elastic energy and the dispersion of a propagating wave. In typical sedimentary rocks, mesoscopic flow can occur within a wide range of scales, from the largest pore size to the smalle ...
Topography and geoid due to lithospheric mass anomalies
... radially stratified viscous earth are often used (Richards & Hager 1984; Ricard et al. 1984; Forte & Peltier, 1989). These models are successful in explaining the long-wavelength geoid when a lithospheric viscosity not higher than that of the lower mantle is used. However, the concept of plate tecto ...
... radially stratified viscous earth are often used (Richards & Hager 1984; Ricard et al. 1984; Forte & Peltier, 1989). These models are successful in explaining the long-wavelength geoid when a lithospheric viscosity not higher than that of the lower mantle is used. However, the concept of plate tecto ...
54. Regional Geology of the Goban Spur Continental Margin
... cur. One of these usually caps a mound-like buildup of indistinct reflectors, which passes laterally into the normal layered structure of sequence 3. Reflectors of this type are identified as reef bodies (Fig. 9). The other type is flat-lying to irregular, usually of very high amplitude, has no obvi ...
... cur. One of these usually caps a mound-like buildup of indistinct reflectors, which passes laterally into the normal layered structure of sequence 3. Reflectors of this type are identified as reef bodies (Fig. 9). The other type is flat-lying to irregular, usually of very high amplitude, has no obvi ...
Lithospheric strength variations in Mainland China: Tectonic
... The strength distribution in the continental lithosphere plays an essential role in controlling the behavior of continental deformation [e.g., Ranalli and Adams, 2013]. The present tectonics of Mainland China has been mainly affected by the Indo-Asian continental collision in the southwest, which ha ...
... The strength distribution in the continental lithosphere plays an essential role in controlling the behavior of continental deformation [e.g., Ranalli and Adams, 2013]. The present tectonics of Mainland China has been mainly affected by the Indo-Asian continental collision in the southwest, which ha ...
Zha, Y., S. C. Webb, S. S. Wei, D. A. Wiens, D. K. Blackman, W
... Despite the well documented trend of surface ridge characteristics at the ELSC, few seismic studies have imaged the 3D velocity variation in the mantle wedge, and the interaction between wet melting beneath the arc and decompression melting beneath the back-arc remains poorly understood. Previous se ...
... Despite the well documented trend of surface ridge characteristics at the ELSC, few seismic studies have imaged the 3D velocity variation in the mantle wedge, and the interaction between wet melting beneath the arc and decompression melting beneath the back-arc remains poorly understood. Previous se ...
Faulting and hydration of the Juan de Fuca plate system
... Multichannel seismic observations provide the first direct images of crustal scale normal faults within the Juan de Fuca plate system and indicate that brittle deformation extends up to ~ 200 km seaward of the Cascadia trench. Within the sedimentary layering steeply dipping faults are identified by st ...
... Multichannel seismic observations provide the first direct images of crustal scale normal faults within the Juan de Fuca plate system and indicate that brittle deformation extends up to ~ 200 km seaward of the Cascadia trench. Within the sedimentary layering steeply dipping faults are identified by st ...
Faulting and hydration of the Juan de Fuca plate system
... Multichannel seismic observations provide the first direct images of crustal scale normal faults within the Juan de Fuca plate system and indicate that brittle deformation extends up to ~ 200 km seaward of the Cascadia trench. Within the sedimentary layering steeply dipping faults are identified by st ...
... Multichannel seismic observations provide the first direct images of crustal scale normal faults within the Juan de Fuca plate system and indicate that brittle deformation extends up to ~ 200 km seaward of the Cascadia trench. Within the sedimentary layering steeply dipping faults are identified by st ...
Subduction factory 2. Are intermediate
... [1995] and Kirby [1995], who suggested that intermediatedepth earthquakes are the result of dehydration reactions in general. Improved seismic imaging and earthquake locations show that the main zone of intermediate-depth earthquakes lies at the top of the subducting plate, not within its cold inter ...
... [1995] and Kirby [1995], who suggested that intermediatedepth earthquakes are the result of dehydration reactions in general. Improved seismic imaging and earthquake locations show that the main zone of intermediate-depth earthquakes lies at the top of the subducting plate, not within its cold inter ...
Anisotropic Pn tomography of Turkey and adjacent regions
... anisotropy of uppermost mantle and crustal thickness beneath Turkey and adjacent regions. From 1999 to 2010, more than 50 000 Pn arrivals are compiled from 700 regional earthquakes and 832 stations of permanent and temporary networks operated in the study area. We used a regularized least-squares in ...
... anisotropy of uppermost mantle and crustal thickness beneath Turkey and adjacent regions. From 1999 to 2010, more than 50 000 Pn arrivals are compiled from 700 regional earthquakes and 832 stations of permanent and temporary networks operated in the study area. We used a regularized least-squares in ...
Do fracture zones define continental margin segmentation
... and intrusions. In particular, two sharp rises in the basement surface are observed at the toe of the Demerara Plateau on Profile D and are interpreted as volcanic in nature. Whilst a detailed 3D description of the basement is not possible with the MCS data available, a pseudo-3D description can be a ...
... and intrusions. In particular, two sharp rises in the basement surface are observed at the toe of the Demerara Plateau on Profile D and are interpreted as volcanic in nature. Whilst a detailed 3D description of the basement is not possible with the MCS data available, a pseudo-3D description can be a ...
Chapter 8 Let`s take it from the top: the crust and upper mantle
... is well known from seismology, and lmowledge of the fine structure is improving continuously. Seismology not only provides the structure, it also provides information about the composition, mineralogy, dynamics and physical state. A 1D seismological model of the Earth is shown in Figure 8.1. Earth i ...
... is well known from seismology, and lmowledge of the fine structure is improving continuously. Seismology not only provides the structure, it also provides information about the composition, mineralogy, dynamics and physical state. A 1D seismological model of the Earth is shown in Figure 8.1. Earth i ...