geological-geophysical exploration of the bauxite deposits
... developed program package VESNA was used. Except for the specific qualities linked with the sei mic behaviour of the shallower subsurface, the p ocessing takes place according to the same algorithms as the deep reflection data processing, which method - as known - represents the basic geophysical me ...
... developed program package VESNA was used. Except for the specific qualities linked with the sei mic behaviour of the shallower subsurface, the p ocessing takes place according to the same algorithms as the deep reflection data processing, which method - as known - represents the basic geophysical me ...
Electrical conductivity structure of the Alpine Fault and its
... fault overcoming the strength of the frictional force resisting the fault rupturing. Since we are unable to measure these forces directly, we must use surface geophysical measurements to provide information about other properties that are indirectly related to these forces. In this EQC funded projec ...
... fault overcoming the strength of the frictional force resisting the fault rupturing. Since we are unable to measure these forces directly, we must use surface geophysical measurements to provide information about other properties that are indirectly related to these forces. In this EQC funded projec ...
Earthquake handout
... fastest waves, they travel through the earth’s inner layers. Secondary or S waves travel slower than P waves, they also travel through the earth’s inner layers. Surface waves are the slowest waves, they travel along the surface of the earth. Surface waves are felt on land and damage buildings. T ...
... fastest waves, they travel through the earth’s inner layers. Secondary or S waves travel slower than P waves, they also travel through the earth’s inner layers. Surface waves are the slowest waves, they travel along the surface of the earth. Surface waves are felt on land and damage buildings. T ...
Lithospheric Layering in the North American Craton
... have made common conversion point (CCP) stacked Ps and Sp receiver function image volumes to determine, in more detail and higher resolution than previously obtained, the crustal thickness and the depth to the Moho and lithosphere-asthenosphere boundary (LAB) throughout the Western U.S. Individual r ...
... have made common conversion point (CCP) stacked Ps and Sp receiver function image volumes to determine, in more detail and higher resolution than previously obtained, the crustal thickness and the depth to the Moho and lithosphere-asthenosphere boundary (LAB) throughout the Western U.S. Individual r ...
Receiver Functions of Seismic Waves in Layered Anisotropic Media
... to the time derivative of that of the radial component, indicating that shear-wave splitting happens to the Ps phase during the propagation in the surface anisotropic layer (Silver and Chang, 1991). Similar splitting is also seen in waveforms of the later phases reverberated in the surface layer. Th ...
... to the time derivative of that of the radial component, indicating that shear-wave splitting happens to the Ps phase during the propagation in the surface anisotropic layer (Silver and Chang, 1991). Similar splitting is also seen in waveforms of the later phases reverberated in the surface layer. Th ...
About Earthquake
... Geoscientists are able to identify particular areas of risk and, if there is sufficient information, to make probabilistic forecasts about the likelihood of earthquakes happening in a specified area over a specified period. These forecasts are based on data gathered through global seismic monitoring ...
... Geoscientists are able to identify particular areas of risk and, if there is sufficient information, to make probabilistic forecasts about the likelihood of earthquakes happening in a specified area over a specified period. These forecasts are based on data gathered through global seismic monitoring ...
Global Prevalence of Double Benioff Zones
... We have developed a straightforward method for determining the separation between layers of a DBZ that can also assess the existence of a DBZ. This technique determines the distribution of events in the slab-normal direction for a given slab segment such that seismic layers appear as peaks in earthq ...
... We have developed a straightforward method for determining the separation between layers of a DBZ that can also assess the existence of a DBZ. This technique determines the distribution of events in the slab-normal direction for a given slab segment such that seismic layers appear as peaks in earthq ...
Variations in MidContinent Rift magma volumes consistent with
... crustal thickening was found in the east arm by Halls [1982]. Seismic reflection data from the GLIMPCE program of active source studies across Lake Superior [Cannon et al., 1989; Shay and Trehu, 1993] show that the crust was initially thinned to about one fourth of its original thickness. The resulti ...
... crustal thickening was found in the east arm by Halls [1982]. Seismic reflection data from the GLIMPCE program of active source studies across Lake Superior [Cannon et al., 1989; Shay and Trehu, 1993] show that the crust was initially thinned to about one fourth of its original thickness. The resulti ...
Crustal structure beneath the Strait of Juan de Fuca and southern
... acceptable starting model that roughly matches the observed and calculated travel times. The travel times were then inverted using the raytrace-based inversion scheme of Zelt and Smith [1992]. This inversion is performed in a layerstripping fashion, where the parameters of successively deeper layers ...
... acceptable starting model that roughly matches the observed and calculated travel times. The travel times were then inverted using the raytrace-based inversion scheme of Zelt and Smith [1992]. This inversion is performed in a layerstripping fashion, where the parameters of successively deeper layers ...
Intrusive dike complexes, cumulate cores, and the extrusive growth
... and 7 km of preexisting oceanic crust [Watts et al., 1985]. The density distribution was found by solving an optimization problem of minimizing a model objective function while generating synthetic data that fall within the uncertainty of the observed data [e.g., Li and Oldenburg, 1998; Flinders et ...
... and 7 km of preexisting oceanic crust [Watts et al., 1985]. The density distribution was found by solving an optimization problem of minimizing a model objective function while generating synthetic data that fall within the uncertainty of the observed data [e.g., Li and Oldenburg, 1998; Flinders et ...
Seismicity and Earth`s Interior - North Coast Distance Education
... Earthquakes pose a significant threat to much of the world’s population. On average, several tens of thousands of people die each year because of large earthquakes. Figure 18.6 shows the expected probability of earthquakes in the conterminous United States. The principal areas exposed to earthquake ...
... Earthquakes pose a significant threat to much of the world’s population. On average, several tens of thousands of people die each year because of large earthquakes. Figure 18.6 shows the expected probability of earthquakes in the conterminous United States. The principal areas exposed to earthquake ...
Distinct crustal isostasy trends east and west of the Rocky Mountain
... construct Rayleigh wave phase velocity maps between 8 and 24 s period (Figure 1). For each period and station, the Rayleigh wave ellipticity, or horizontal-to-vertical amplitude ratio (H/V ratio), was determined by averaging all available vertical to radial component cross-correlation amplitude rati ...
... construct Rayleigh wave phase velocity maps between 8 and 24 s period (Figure 1). For each period and station, the Rayleigh wave ellipticity, or horizontal-to-vertical amplitude ratio (H/V ratio), was determined by averaging all available vertical to radial component cross-correlation amplitude rati ...
Distinct Updip Limits to Geodetic Locking and Microseismicity at the
... were relocated using a simultaneous inversion of P- and S-wave arrival times to solve for earthquake location and three-dimensional velocity structure [DeShon et al. 2006]. These events have a location precision (one standard error) better than 1 km in both horizontal and vertical components. Interp ...
... were relocated using a simultaneous inversion of P- and S-wave arrival times to solve for earthquake location and three-dimensional velocity structure [DeShon et al. 2006]. These events have a location precision (one standard error) better than 1 km in both horizontal and vertical components. Interp ...
PDF (Chapter 3. The Crust and Upper Mantle)
... Uppermost mantle velocities are typically 8.0 to 8.2 kmls, and the spread is about 7.9-8.6 kmls. Some long refraction profiles give evidence for a deeper layer in the lithosphere having a velocity of 8.6 km/s. The seismic lithosphere, or LID, appears to contain at least two layers. Long refraction p ...
... Uppermost mantle velocities are typically 8.0 to 8.2 kmls, and the spread is about 7.9-8.6 kmls. Some long refraction profiles give evidence for a deeper layer in the lithosphere having a velocity of 8.6 km/s. The seismic lithosphere, or LID, appears to contain at least two layers. Long refraction p ...
Spatial variations in the frequency
... VELEST solution was used (Kissling et al., 1994) as the starting one-dimensional (1-D) model, and a minimal grid spacing of 15 km is used for the SIMUL2000 program. Following the tomographic inversion, a detailed 3-D velocity model was obtained (Lin et al., 2006a, accepted), and all of the earthquak ...
... VELEST solution was used (Kissling et al., 1994) as the starting one-dimensional (1-D) model, and a minimal grid spacing of 15 km is used for the SIMUL2000 program. Following the tomographic inversion, a detailed 3-D velocity model was obtained (Lin et al., 2006a, accepted), and all of the earthquak ...
UK Geohazard Note | Seismic hazard
... Damage from British earthquakes is typically light. The major observed effects are the fall of parts of old chimney stacks in poor repair; bricks and chimney pots come crashing down onto roofs, causing secondary damage. Cracks to interior plaster and fall of plaster also occurs. Complete collapse of ...
... Damage from British earthquakes is typically light. The major observed effects are the fall of parts of old chimney stacks in poor repair; bricks and chimney pots come crashing down onto roofs, causing secondary damage. Cracks to interior plaster and fall of plaster also occurs. Complete collapse of ...