Uppermost mantle structure of the eastern margin of the Tibetan
... northeastern portions of the LFB (roughly beginning at N31.51) still have significant differences in seismic activity and rupture process (Wen, 1995; Zhang et al., 2008; Huang et al., 2008; Chen et al., 2009; Zheng et al., 2009). The only three strong earthquakes (with magnitude of 6.0–6.5) before ...
... northeastern portions of the LFB (roughly beginning at N31.51) still have significant differences in seismic activity and rupture process (Wen, 1995; Zhang et al., 2008; Huang et al., 2008; Chen et al., 2009; Zheng et al., 2009). The only three strong earthquakes (with magnitude of 6.0–6.5) before ...
Evidence of active mantle flow beneath South China
... Indeed, a comparison of the predicted SKS observations from the surface deformation field with SKS data, following the method of Wang et al. [2008] used for Tibet, yields an average misfit of 41° illustrating no correlation between present-day surface deformation and anisotropy in South China. This re ...
... Indeed, a comparison of the predicted SKS observations from the surface deformation field with SKS data, following the method of Wang et al. [2008] used for Tibet, yields an average misfit of 41° illustrating no correlation between present-day surface deformation and anisotropy in South China. This re ...
On the Accuracy of Mapping the Lateral Extent of Hydrocarbon
... Figure 2 shows how the resistivity increase with increasing hydrocarbon (HC) saturation, as a result of Archie’s law. If the HC saturation is increased to more than approximately 50 % the change in resistivity will be significantly high enough to be detected by CSEM. As a comparison, the P-wave velo ...
... Figure 2 shows how the resistivity increase with increasing hydrocarbon (HC) saturation, as a result of Archie’s law. If the HC saturation is increased to more than approximately 50 % the change in resistivity will be significantly high enough to be detected by CSEM. As a comparison, the P-wave velo ...
39. crustal structure along the leg 152 drilling transect
... Seismic data, drilling data, and gravity data define a 40-km-wide continent-ocean transition (COT) below the outer half of the 70- to 80-km-wide shelf along the Leg 152 drilling transect. The seismic data include a detailed grid of shallow high-resolution seismic data; a regional grid of conventiona ...
... Seismic data, drilling data, and gravity data define a 40-km-wide continent-ocean transition (COT) below the outer half of the 70- to 80-km-wide shelf along the Leg 152 drilling transect. The seismic data include a detailed grid of shallow high-resolution seismic data; a regional grid of conventiona ...
Seismic evaluation of old masonry buildings. Part I: Method
... has few peaks with amplitude similar to the maximum amplitude. This problem can only be accounted for in time history analyses, which is obviously more complex. It is probably much less important in the case of long duration accelerograms with several peaks with amplitude similar to the maximum, whi ...
... has few peaks with amplitude similar to the maximum amplitude. This problem can only be accounted for in time history analyses, which is obviously more complex. It is probably much less important in the case of long duration accelerograms with several peaks with amplitude similar to the maximum, whi ...
Three-dimensional density structures of Taiwan and tectonic
... observed gravity anomaly, is well known to have an intrinsic non-uniqueness in its solution. Typical inversion methods generally search for analytical solutions to linearizable problems using linear approaches or iterative methods. However, linearized techniques are dependent on the accuracy of the ...
... observed gravity anomaly, is well known to have an intrinsic non-uniqueness in its solution. Typical inversion methods generally search for analytical solutions to linearizable problems using linear approaches or iterative methods. However, linearized techniques are dependent on the accuracy of the ...
The Science of Tsunamis
... seismic and ocean monitoring networks, landbased global positioning systems (GPS) and tsunami modeling software—to better comprehend the scope of this event. Details of the WesternGeco tsunami seismic survey will be included, along with some preliminary findings. This article also reviews the status ...
... seismic and ocean monitoring networks, landbased global positioning systems (GPS) and tsunami modeling software—to better comprehend the scope of this event. Details of the WesternGeco tsunami seismic survey will be included, along with some preliminary findings. This article also reviews the status ...
- Stanford University
... large-scale structure required by the data. The final smoothing operator was 40 × 40 × 4 km. This result is intentionally underconverged to ensure that the three-dimensional structure is averaged over several receivers, and is thus less likely to be biased by local errors at shallow depth. The start ...
... large-scale structure required by the data. The final smoothing operator was 40 × 40 × 4 km. This result is intentionally underconverged to ensure that the three-dimensional structure is averaged over several receivers, and is thus less likely to be biased by local errors at shallow depth. The start ...
Imag(in)ing the continental lithosphere
... mantle beneath the continents. Since the structure of the mantle at small to intermediate scales (1–30 km) is poorly known, we refer to developmental models for the mantle and the continents as well as available field data. We estimate the petrophysical contrasts that are likely at these heterogenei ...
... mantle beneath the continents. Since the structure of the mantle at small to intermediate scales (1–30 km) is poorly known, we refer to developmental models for the mantle and the continents as well as available field data. We estimate the petrophysical contrasts that are likely at these heterogenei ...
The Structure of the Continental Lithosphere
... 1. Is the MLD a single sharp discontinuity or a region where velocity changes gradually with depth? – the nature of the MLD seems to change with location. Age? Geologic structures? 1. Can we constrain how sharp or gradient the discontinuity is? – Yes, using the frequency dependence of gradient featu ...
... 1. Is the MLD a single sharp discontinuity or a region where velocity changes gradually with depth? – the nature of the MLD seems to change with location. Age? Geologic structures? 1. Can we constrain how sharp or gradient the discontinuity is? – Yes, using the frequency dependence of gradient featu ...
Seismic Anisotropy: Tracing Plate Dynamics in the Mantle
... Here we review recent studies of uppermantle anisotropy and its relation to global plate motions, past and present. Four basic seismic wave behaviors have been used to identify seismic anisotropy: direction-dependent travel time anomalies, shear-wave birefringence, surface-wave scattering, and direc ...
... Here we review recent studies of uppermantle anisotropy and its relation to global plate motions, past and present. Four basic seismic wave behaviors have been used to identify seismic anisotropy: direction-dependent travel time anomalies, shear-wave birefringence, surface-wave scattering, and direc ...
Originally published as: Ivanova, A., Kashubin, A
... The post-stack processing, cross-calibration and analysis of the seismic volumes after step 24 (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 s ...
... The post-stack processing, cross-calibration and analysis of the seismic volumes after step 24 (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 s ...
Deformation in the Lower Crust of the San Andreas Fault System in
... of the LCL along the margin with a detachment beneath all of coastal California slipping at up to the total SAF motion. Although contraction across the SAF at 5 to 6 mm/year (22) since 30 Ma can match the extent of the high-velocity lowermost crustal layer, such a detachment without recorded seismic ...
... of the LCL along the margin with a detachment beneath all of coastal California slipping at up to the total SAF motion. Although contraction across the SAF at 5 to 6 mm/year (22) since 30 Ma can match the extent of the high-velocity lowermost crustal layer, such a detachment without recorded seismic ...
- Wiley Online Library
... of oceanic crust [Bronner et al., 2011; Granot et al., 2012]. The J anomaly is the most prominent magnetic anomaly observed within the COT at both the Iberia and Newfoundland margins (Figure 1b). This anomaly is interpreted as the beginning of the M sequence of seafloor spreading anomalies (M0–M3) or ...
... of oceanic crust [Bronner et al., 2011; Granot et al., 2012]. The J anomaly is the most prominent magnetic anomaly observed within the COT at both the Iberia and Newfoundland margins (Figure 1b). This anomaly is interpreted as the beginning of the M sequence of seafloor spreading anomalies (M0–M3) or ...
d(M|s) - University of Utah`s Tomography and Modeling/Migration
... Every VSP source at different S reflects off M And recorded at g We accidentally found specular ray for given (M,g), & stationary phase says this is dominant contribution. Uninteresting Part of Medium s ...
... Every VSP source at different S reflects off M And recorded at g We accidentally found specular ray for given (M,g), & stationary phase says this is dominant contribution. Uninteresting Part of Medium s ...
Subduction erosion along the Middle America convergent margin
... ducting ocean crust is thin (,5 km) and cut by many normal faults with ,0.5-km displacement11,13,14. Variations of crustal structure and sea¯oor morphology of the subducting plate correspond with regional and local changes in upper-plate thickness along the margin. On a regional scale, the ocean cru ...
... ducting ocean crust is thin (,5 km) and cut by many normal faults with ,0.5-km displacement11,13,14. Variations of crustal structure and sea¯oor morphology of the subducting plate correspond with regional and local changes in upper-plate thickness along the margin. On a regional scale, the ocean cru ...
Seismic detection and characterization of the
... largest spike (Gaussian) in the receiver function. Then the current estimate of the receiver function is convolved with the vertical component and subtracted from the radial component, and the procedure is repeated to estimate other spike lags and amplitudes. With each additional spike in the receiv ...
... largest spike (Gaussian) in the receiver function. Then the current estimate of the receiver function is convolved with the vertical component and subtracted from the radial component, and the procedure is repeated to estimate other spike lags and amplitudes. With each additional spike in the receiv ...
SEISMIC-WAVE TRANSMISSION ACROSS THE CARIBBEAN
... Focal spectrum variations. The focal spectrum varies essentially with focal depth and magnitude. The first effect is not important in this ease as focal depths are reasonably close for all events (17 to 65 km). The effect of magnitude is essentially a broadening of the bandwidth and an increase of l ...
... Focal spectrum variations. The focal spectrum varies essentially with focal depth and magnitude. The first effect is not important in this ease as focal depths are reasonably close for all events (17 to 65 km). The effect of magnitude is essentially a broadening of the bandwidth and an increase of l ...