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 ...
Asymmetry of high-velocity lower crust on the South
... the onshore parts of seismic lines 4 and 5 lie within the Damara Belt, whereas lines 6 and 7 cross the Gariep Belt at the coast and extend into the Namaqua-Natal Mobile Belt to the east. The seismic traverse across the southern margin of Africa (Stankiewicz et al., 2008) crosses the Cape Fold Belt a ...
... the onshore parts of seismic lines 4 and 5 lie within the Damara Belt, whereas lines 6 and 7 cross the Gariep Belt at the coast and extend into the Namaqua-Natal Mobile Belt to the east. The seismic traverse across the southern margin of Africa (Stankiewicz et al., 2008) crosses the Cape Fold Belt a ...
DIVERGENCE-FREE WAVELET PROJECTION METHOD
... matrix of the 2D Laplacian operator on the wavelet basis associated to the multiresolution analysis (Vjd ⊗ Vjd ) of H01 (Ω). Following [8], we showed in [25] that its diagonal is an optimal preconditioner. The tensor structure of the basis allows to reduce the complexity of matrix-vector product Mdi ...
... matrix of the 2D Laplacian operator on the wavelet basis associated to the multiresolution analysis (Vjd ⊗ Vjd ) of H01 (Ω). Following [8], we showed in [25] that its diagonal is an optimal preconditioner. The tensor structure of the basis allows to reduce the complexity of matrix-vector product Mdi ...
Moho map of South America from receiver functions and surface
... der Lee et al., 2001], and 225 Moho depth point constraints (new ones from this study together with the continent‐wide compilation by Feng et al. [2004]), of which 67 lie in Precambrian provinces. For the oceanic parts of our model, where no point constraints are available, we insert predicted value ...
... der Lee et al., 2001], and 225 Moho depth point constraints (new ones from this study together with the continent‐wide compilation by Feng et al. [2004]), of which 67 lie in Precambrian provinces. For the oceanic parts of our model, where no point constraints are available, we insert predicted value ...
LECTURE 8 - Research School of Earth Sciences
... Mohorovičić discontinuity, and to provide an Earth science complement to the high profile Space Race. It was led by the American Miscellaneous Society with funding from the National Science Foundation. Phase One was executed in spring 1961. Off the coast of Guadalupe, Mexico, five holes were drilled ...
... Mohorovičić discontinuity, and to provide an Earth science complement to the high profile Space Race. It was led by the American Miscellaneous Society with funding from the National Science Foundation. Phase One was executed in spring 1961. Off the coast of Guadalupe, Mexico, five holes were drilled ...
SEISMIC AND ASEISMIC SLIP ALONG SUBDUCTION ZONES AND
... The geometrical agreement of focal mechanisms of earthquakes along the Circum-Pacific belt led McKenzie and Parker [1967] to the concept of rigid plates dividing the earth's surface. Isacks and Molnar [1969] used the geometry of the compression and tension axes of deep and intermediate earthquakes t ...
... The geometrical agreement of focal mechanisms of earthquakes along the Circum-Pacific belt led McKenzie and Parker [1967] to the concept of rigid plates dividing the earth's surface. Isacks and Molnar [1969] used the geometry of the compression and tension axes of deep and intermediate earthquakes t ...
Crustal architecture of the Capricorn Orogen, Western Australia and
... Horwitz & Smith 1978; Gee 1979) favoured an intracratonic setting. These were followed by plate tectonic models in which the Proterozoic orogeny was driven by collision between the hitherto unrelated Pilbara and Yilgarn Cratons (Muhling 1988; Tyler & Thorne 1990; Blake & Barley 1992; Powell & Horwit ...
... Horwitz & Smith 1978; Gee 1979) favoured an intracratonic setting. These were followed by plate tectonic models in which the Proterozoic orogeny was driven by collision between the hitherto unrelated Pilbara and Yilgarn Cratons (Muhling 1988; Tyler & Thorne 1990; Blake & Barley 1992; Powell & Horwit ...
Chapter 1: Seismic Wave Attenuation
... earthquake. There are two main types of seismic waves, the surface waves and the body waves. Body waves are waves that penetrate deeply thorough the interior of the Earth. These waves represent short pulses of propagating energy. They follow refracted raypaths determined by the elastic moduli and de ...
... earthquake. There are two main types of seismic waves, the surface waves and the body waves. Body waves are waves that penetrate deeply thorough the interior of the Earth. These waves represent short pulses of propagating energy. They follow refracted raypaths determined by the elastic moduli and de ...
Detection of subducted lithosphere in the midmantle from
... about the structure of the upper mantle. Underside reflections of PP (and SS) beneath the mid-reflection point off the upper mantle discontinuities have been extensively used to map topography on the discontinuities and to infer temperature and composition of the mantle. However, additional precurso ...
... about the structure of the upper mantle. Underside reflections of PP (and SS) beneath the mid-reflection point off the upper mantle discontinuities have been extensively used to map topography on the discontinuities and to infer temperature and composition of the mantle. However, additional precurso ...
Chapter 22: Section 5
... provided scientists with a wealth of data on earthquakes. Some earthquakes occur in the interior of plates, far away from plate boundaries. As a plate moves, it undergoes deformation. The resulting stresses are released as earthquakes. ...
... provided scientists with a wealth of data on earthquakes. Some earthquakes occur in the interior of plates, far away from plate boundaries. As a plate moves, it undergoes deformation. The resulting stresses are released as earthquakes. ...
seismic potential associated with subduction in the northwestern
... We have seen that there are systematic differences between subduction zones that are capable of great earthquakes and those that are not. The Juan de Fuca subduction zone has been ignored in the studies that established these differences. The Juan de Fuca subduction zone has been considered somewhat ...
... We have seen that there are systematic differences between subduction zones that are capable of great earthquakes and those that are not. The Juan de Fuca subduction zone has been ignored in the studies that established these differences. The Juan de Fuca subduction zone has been considered somewhat ...
empirical correlation between the shear
... Varaždin is located in the north-western part of Croatia in shallow quaternary alluvial sediments of the Drava River basin. Local site effects due to the alluvial soft sediments can play a crucial role in the amplification of seismic-wave ground motions. The shear-wave velocity (VS) is one of the mo ...
... Varaždin is located in the north-western part of Croatia in shallow quaternary alluvial sediments of the Drava River basin. Local site effects due to the alluvial soft sediments can play a crucial role in the amplification of seismic-wave ground motions. The shear-wave velocity (VS) is one of the mo ...
Geochemical reservoirs and whole
... Hofmann, 1994) or exclusively recent (All~gre, 1997) phenomena. In this context is also important to know which form the upwelling from the deep mantle takes. Do present-day mantle plumes originate at the core-mantle boundary or at the 660 km boundary or both? Can we distinguish deepmantle plumes fr ...
... Hofmann, 1994) or exclusively recent (All~gre, 1997) phenomena. In this context is also important to know which form the upwelling from the deep mantle takes. Do present-day mantle plumes originate at the core-mantle boundary or at the 660 km boundary or both? Can we distinguish deepmantle plumes fr ...
A Geoelectric Model of the Cascadia Subduction Zone
... are discussed. A 2-D interpretation of magnetic variation and magnetotelluric data was conducted in a hypothesis-testing mode. Three hypotheses were examined: (1) fluid saturation of the lower continental crust and the absence of continental asthenosphere; (2) fluid saturation of the lower continent ...
... are discussed. A 2-D interpretation of magnetic variation and magnetotelluric data was conducted in a hypothesis-testing mode. Three hypotheses were examined: (1) fluid saturation of the lower continental crust and the absence of continental asthenosphere; (2) fluid saturation of the lower continent ...
Constraining P-wave velocity variations in the upper mantle beneath
... larger depths is reduced by a crustal correction using an a priori 3D model. Our tomographic inversions reveal high-velocity roots beneath the Archean Ordos Plateau, the Sichuan Basin, and other continental blocks in SE Asia. Beneath the Himalayan Block we detect high seismic velocities, which we as ...
... larger depths is reduced by a crustal correction using an a priori 3D model. Our tomographic inversions reveal high-velocity roots beneath the Archean Ordos Plateau, the Sichuan Basin, and other continental blocks in SE Asia. Beneath the Himalayan Block we detect high seismic velocities, which we as ...
Understanding the thermal evolution of deep
... plains5. Third, has the margin been deformed to generate large subsurface structures suitable for trapping billions of barrels of hydrocarbons? Shallow-water exploration has demonstrated the importance of subtler stratigraphic traps, but during the early stages of exploration, large and easily ident ...
... plains5. Third, has the margin been deformed to generate large subsurface structures suitable for trapping billions of barrels of hydrocarbons? Shallow-water exploration has demonstrated the importance of subtler stratigraphic traps, but during the early stages of exploration, large and easily ident ...
Seismic strike-slip faults on a major boundary transverse to the
... Although there are not enough seismological data for this region, the fault plane solutions of some recent earthquakes which occurred in the offshore area (three main shocks: 1986 Mb=4.2, 1988 Mb=5.3 and 1989 Mb=4.7), (Favali et al. [8]) are in accordance with the tectonic data and display strike-sl ...
... Although there are not enough seismological data for this region, the fault plane solutions of some recent earthquakes which occurred in the offshore area (three main shocks: 1986 Mb=4.2, 1988 Mb=5.3 and 1989 Mb=4.7), (Favali et al. [8]) are in accordance with the tectonic data and display strike-sl ...
Relationship between seismic and gravity anomalies at
... the Víti crater). Because they do not show strong shear wave attenuation, they do not represent magma. It is probably due to high porosity in the basaltic intrusive and is related to geothermal aquifers. Seismic velocity structure at Krafla is characterized by large variations in compressional veloc ...
... the Víti crater). Because they do not show strong shear wave attenuation, they do not represent magma. It is probably due to high porosity in the basaltic intrusive and is related to geothermal aquifers. Seismic velocity structure at Krafla is characterized by large variations in compressional veloc ...