Velocity increase in the uppermost oceanic crust of subducting
... Philippine Sea plate. The distinct trapped P waves observed by the dense seismic network of the Kanto-Tokai region, Japan, did not show any apparent peak delay and frequency-dependent dispersion. These observations suggested that the oceanic crust around the source depths was characterized by a homo ...
... Philippine Sea plate. The distinct trapped P waves observed by the dense seismic network of the Kanto-Tokai region, Japan, did not show any apparent peak delay and frequency-dependent dispersion. These observations suggested that the oceanic crust around the source depths was characterized by a homo ...
This document in RTF format
... In 1993 a large seafloor volcanic eruption occurred along the CoAxial segment of the JdF, immediately to the north of Axial Volcano. This eruption was detected during its early stages by SOSUS observations (Fox et al., 1995), and subsequently studied intensively (e.g. special section in January 15, ...
... In 1993 a large seafloor volcanic eruption occurred along the CoAxial segment of the JdF, immediately to the north of Axial Volcano. This eruption was detected during its early stages by SOSUS observations (Fox et al., 1995), and subsequently studied intensively (e.g. special section in January 15, ...
Magmatic processes at slow spreading ridges
... spreading centres themselves; for example, whether the axes are marked by topographic highs or by median valleys. Early explanations (e.g. Cann 1974) for the composition and layering of oceanic crust drew heavily on observations of ophiolites, and postulated the existence of large crustal magma cham ...
... spreading centres themselves; for example, whether the axes are marked by topographic highs or by median valleys. Early explanations (e.g. Cann 1974) for the composition and layering of oceanic crust drew heavily on observations of ophiolites, and postulated the existence of large crustal magma cham ...
Hydrated subducted crust at 100^250 km depth
... The one known exception is the reported pattern for Tonga, where high frequencies precede low-frequency arrivals at stations in New Zealand [7,10,14]. The Tonga paths are generally much longer than those described above and many sources are much deeper, so that nearly all raypaths bottom at or below ...
... The one known exception is the reported pattern for Tonga, where high frequencies precede low-frequency arrivals at stations in New Zealand [7,10,14]. The Tonga paths are generally much longer than those described above and many sources are much deeper, so that nearly all raypaths bottom at or below ...
Dependence of earthquake recurrence times and independence of
... The slow decay provided by the decreasing power law is a signature of clustering, which means that the events tend to be closer to each other in the short time scale, in comparison with a Poisson process (given by f exponential, i.e., γ = a = δ = 1). In fact, clustering is more clearly identified by ...
... The slow decay provided by the decreasing power law is a signature of clustering, which means that the events tend to be closer to each other in the short time scale, in comparison with a Poisson process (given by f exponential, i.e., γ = a = δ = 1). In fact, clustering is more clearly identified by ...
study on seismic behavior of various rc buildings under
... Earthquake causes loss of life, damages the built and natural environment. In order to take precaution for the loss of life and damage of structures due to the ground motion, it is important to understand the characteristics of the ground motion. The important dynamic characteristics of earthquake a ...
... Earthquake causes loss of life, damages the built and natural environment. In order to take precaution for the loss of life and damage of structures due to the ground motion, it is important to understand the characteristics of the ground motion. The important dynamic characteristics of earthquake a ...
One-dimensional physical reference models for the upper mantle
... (PREM) is dominated by the constraints from free oscillation frequencies and surface wave dispersion curves, but also included a set of P wave and S wave travel times. In addition, the model was constrained to fit the Earth’s mass and moment of inertia. PREM gives VP, VS, density, and anelasticity a ...
... (PREM) is dominated by the constraints from free oscillation frequencies and surface wave dispersion curves, but also included a set of P wave and S wave travel times. In addition, the model was constrained to fit the Earth’s mass and moment of inertia. PREM gives VP, VS, density, and anelasticity a ...
- Arizona State University
... an intermediate velocity between those found for the Delaware basin and San Juan Basin was used, depending on the lithology of the local sedimentary layer. [11] The starting crustal P wave velocity model used for velocity analysis was constructed using a host of published refraction results [e.g., R ...
... an intermediate velocity between those found for the Delaware basin and San Juan Basin was used, depending on the lithology of the local sedimentary layer. [11] The starting crustal P wave velocity model used for velocity analysis was constructed using a host of published refraction results [e.g., R ...
12. Interpretation of Multichannel Seismic Reflection Data, Legs 56
... One of the first major geophysical studies of the Japan Trench area off Sanriku in northern Honshu was the result of a joint U.S.-Japanese two-ship expedition and was reported by Ludwig and others (1966). They demonstrated that the trench seaward slope is broken by numerous normal faults presumed to ...
... One of the first major geophysical studies of the Japan Trench area off Sanriku in northern Honshu was the result of a joint U.S.-Japanese two-ship expedition and was reported by Ludwig and others (1966). They demonstrated that the trench seaward slope is broken by numerous normal faults presumed to ...
Effect of soft storey on multistoried reinforced concrete building frame
... Reinforced concrete frames with masonry infills are a popular form of construction of high-rise buildings in urban and semi urban areas around the world. The term infilled frame is used to denote a composite structure formed by the combination of a moment resisting plane frame and infill walls. The ...
... Reinforced concrete frames with masonry infills are a popular form of construction of high-rise buildings in urban and semi urban areas around the world. The term infilled frame is used to denote a composite structure formed by the combination of a moment resisting plane frame and infill walls. The ...
CLASSIFICATIONS OF STRUCTURAL TYPES AND DAMAGE
... variety of damage patterns even in complete collapse buildings. Knowing which pattern is greatly concerned in the death is sure to contribute to the improvement of the model and the minimization of casualties in dwellings. Fig.7 shows the relation between the building damage patterns and the casualt ...
... variety of damage patterns even in complete collapse buildings. Knowing which pattern is greatly concerned in the death is sure to contribute to the improvement of the model and the minimization of casualties in dwellings. Fig.7 shows the relation between the building damage patterns and the casualt ...
review of seismic reflection - University Of Nigeria Nsukka
... Seismic reflection method is the most commonly used geophysical technique which applies the principles of seismology for stratigraphic and structural mapping beneath the ground surface to depth of several hundred meters. Seismology is a wide scope in geophysical science that seeks to analyze the nat ...
... Seismic reflection method is the most commonly used geophysical technique which applies the principles of seismology for stratigraphic and structural mapping beneath the ground surface to depth of several hundred meters. Seismology is a wide scope in geophysical science that seeks to analyze the nat ...
Modeling and Simulation of Vibration Isolation System for Large
... LCGT (Large-scale Cryogenic Gravitational wave Telescope), was funded recently and is now being constructed. Seismic motion is an inevitable noise source for ground-based interferometric gravitational wave detectors. The continuous and random motion of the ground can excite the motions of the optica ...
... LCGT (Large-scale Cryogenic Gravitational wave Telescope), was funded recently and is now being constructed. Seismic motion is an inevitable noise source for ground-based interferometric gravitational wave detectors. The continuous and random motion of the ground can excite the motions of the optica ...
How might infinitesimal strain analysis be used as a component of
... Mw 7.2 ShakeMap Scenario for answers to the following questions: What is the expected economic loss from the earthquake? (search for “economic loss”) ...
... Mw 7.2 ShakeMap Scenario for answers to the following questions: What is the expected economic loss from the earthquake? (search for “economic loss”) ...
letters - Institut de Physique du Globe de Paris
... limb, it follows the asymmetric AMC reflections and seafloor morphology, and is elongated in the N158W direction (Figs 1 and 3b). Kent et al.5 have observed a wide (4 km) asymmetric melt sill south of the 98 17 0 N ridge-axis discontinuity. The depth and nature of this extended melt sill is similar ...
... limb, it follows the asymmetric AMC reflections and seafloor morphology, and is elongated in the N158W direction (Figs 1 and 3b). Kent et al.5 have observed a wide (4 km) asymmetric melt sill south of the 98 17 0 N ridge-axis discontinuity. The depth and nature of this extended melt sill is similar ...
Anomalous soil radon fluctuations – signal of earthquakes in Nepal
... Earthquake is basically a large scale fracture phenomena, which causes tremendous devastation and loss of life. For enabling people to minimise such a loss of life and property, it is necessary to predict a potentially damaging earthquake. Over the last few decades, enormous efforts have been put for ...
... Earthquake is basically a large scale fracture phenomena, which causes tremendous devastation and loss of life. For enabling people to minimise such a loss of life and property, it is necessary to predict a potentially damaging earthquake. Over the last few decades, enormous efforts have been put for ...
Antipodal seismic observations of temporal and global variation
... TAM (same as Figure 2) on the Algeria‐Tonga diametral axis (Figure 1) and for the XAN on the China‐Chile axis. Distance and year are noted. Time is relative to the PKIKP peak, and PKIKP amplitudes are scaled to unity. The surface reflection, pPKIKP, above the earthquake is noted with a star. Note th ...
... TAM (same as Figure 2) on the Algeria‐Tonga diametral axis (Figure 1) and for the XAN on the China‐Chile axis. Distance and year are noted. Time is relative to the PKIKP peak, and PKIKP amplitudes are scaled to unity. The surface reflection, pPKIKP, above the earthquake is noted with a star. Note th ...
How might infinitesimal strain analysis be used as a
... Mw 7.2 ShakeMap Scenario for answers to the following questions: What is the expected economic loss from the earthquake? (search for “economic loss”) ...
... Mw 7.2 ShakeMap Scenario for answers to the following questions: What is the expected economic loss from the earthquake? (search for “economic loss”) ...
Proposal_Yan - Geophysics at Georgia Tech
... Especially, Wiemer and Benoit [1996] applied the mapping of frequencymagnitude distribution (FMD) in depth within Alaska and New Zealand subduction zones. They interpreted that high b-value region on the slab profile is associated with the high pore pressure for the reason of magmagenesis, which ind ...
... Especially, Wiemer and Benoit [1996] applied the mapping of frequencymagnitude distribution (FMD) in depth within Alaska and New Zealand subduction zones. They interpreted that high b-value region on the slab profile is associated with the high pore pressure for the reason of magmagenesis, which ind ...
Acquisition of the Blackfoot broad-band seismic survey
... To provide a maximum recording range, 24 bit instruments were used in this survey. Because we expected significant ground roll, were using no arrays for the 3-C geophones, and wanted to be able to extract signal, we need this large dynamic range. In addition, with the 2 Hz geophones being used, it w ...
... To provide a maximum recording range, 24 bit instruments were used in this survey. Because we expected significant ground roll, were using no arrays for the 3-C geophones, and wanted to be able to extract signal, we need this large dynamic range. In addition, with the 2 Hz geophones being used, it w ...
Earthquake engineering
Earthquake engineering or Seismic engineering is a branch of engineering that searches for ways to make structures, such as buildings and bridges, resistant to earthquake damage. Earthquake engineer, better known as a seismic engineer aim to develop building techniques that will prevent any damage in a minor quake and avoid serious damage or collapse in a major shake. It is the scientific field concerned with protecting society, the natural environment, and the man-made environment from earthquakes by limiting the seismic risk to socio-economically acceptable levels. Traditionally, it has been narrowly defined as the study of the behavior of structures and geo-structures subject to seismic loading; it is considered as a subset of both structural and geotechnical engineering. However, the tremendous costs experienced in recent earthquakes have led to an expansion of its scope to encompass disciplines from the wider field of civil engineering, mechanical engineering and from the social sciences, especially sociology, political science, economics and finance. The main objectives of earthquake engineering are: Foresee the potential consequences of strong earthquakes on urban areas and civil infrastructure. Design, construct and maintain structures to perform at earthquake exposure up to the expectations and in compliance with building codes.A properly engineered structure does not necessarily have to be extremely strong or expensive. It has to be properly designed to withstand the seismic effects while sustaining an acceptable level of damage.