Observations from Nonlinear, Effective Stress Ground Motion
... Specifications in recognition that the general procedure for developing site soil factors to correct firmground spectral values given in the AASHTO seismic hazard maps are not suitable for some site conditions, such as Site Class F, and that site-specific ground response analyses can be conducted wi ...
... Specifications in recognition that the general procedure for developing site soil factors to correct firmground spectral values given in the AASHTO seismic hazard maps are not suitable for some site conditions, such as Site Class F, and that site-specific ground response analyses can be conducted wi ...
Determining Distance to Epicenter
... INTRODUCTION: In your previous labs you learned that Earthquakes commonly occur near plate boundaries. When there is movement along a fault (commonly at plate boundaries) an earthquake occurs. At a plate boundary, large pieces of the Earths crust are moving in different directions, over time pressur ...
... INTRODUCTION: In your previous labs you learned that Earthquakes commonly occur near plate boundaries. When there is movement along a fault (commonly at plate boundaries) an earthquake occurs. At a plate boundary, large pieces of the Earths crust are moving in different directions, over time pressur ...
Microseismicity of the ultraslow-spreading Gakkel ridge, Arctic
... the Arctic Ocean, the use of ocean-bottom seismometers bears the risk of instrument and data loss. In this pilot study, we used for the first time drifting ice floes as platforms for small seismological arrays. The arrays consisted of four three-component seismometers equipped with GPS devices and a ...
... the Arctic Ocean, the use of ocean-bottom seismometers bears the risk of instrument and data loss. In this pilot study, we used for the first time drifting ice floes as platforms for small seismological arrays. The arrays consisted of four three-component seismometers equipped with GPS devices and a ...
Microseismicity of the ultraslow-spreading Gakkel ridge
... the Arctic Ocean, the use of ocean-bottom seismometers bears the risk of instrument and data loss. In this pilot study, we used for the first time drifting ice floes as platforms for small seismological arrays. The arrays consisted of four three-component seismometers equipped with GPS devices and a ...
... the Arctic Ocean, the use of ocean-bottom seismometers bears the risk of instrument and data loss. In this pilot study, we used for the first time drifting ice floes as platforms for small seismological arrays. The arrays consisted of four three-component seismometers equipped with GPS devices and a ...
Configuration of subducting Philippine Sea plate and crustal
... region. The crustal velocity structure for the central part of Japan and configuration of the subducting Philippine Sea plate were revealed. A large lateral variation of the thickness of the sedimentary layer was observed, and the P-wave velocity values below the sedimentary layer obtained were 5.3– ...
... region. The crustal velocity structure for the central part of Japan and configuration of the subducting Philippine Sea plate were revealed. A large lateral variation of the thickness of the sedimentary layer was observed, and the P-wave velocity values below the sedimentary layer obtained were 5.3– ...
Very low frequency earthquakes excited by the 2004 off the... earthquakes: A dynamic deformation process in the large accretionary prism
... are considered as regular micro-aftershocks, which are too small to be detected by JMA. On the other hand, we can see some wave trains only in the low-frequency component panel without corresponding high-frequency signals during the time period T2 and T3 in Fig. 2. These are the VLF ...
... are considered as regular micro-aftershocks, which are too small to be detected by JMA. On the other hand, we can see some wave trains only in the low-frequency component panel without corresponding high-frequency signals during the time period T2 and T3 in Fig. 2. These are the VLF ...
Numerical modeling of shear-wave splitting and azimuthal
... Numerical modeling of shear-wave splitting and azimuthal velocity analysis in fractured media Zimin Zhang, Don C. Lawton, and Robert R. Stewart ABSTRACT This report presents the processing and interpretation of seismic modeling data of the earth models for a fractured layer, based on well logs assoc ...
... Numerical modeling of shear-wave splitting and azimuthal velocity analysis in fractured media Zimin Zhang, Don C. Lawton, and Robert R. Stewart ABSTRACT This report presents the processing and interpretation of seismic modeling data of the earth models for a fractured layer, based on well logs assoc ...
Observations and Tectonic Setting of Historic
... Revised locations are computed for a number of historic earthquakes. Most hypocenters are concentrated in older terranes bordering the Mesozoic Newark basin in the Reading, Manhattan, and Trenton prongs and in similar rocks found at a shallow depth beneath the coastal plain from south of New York Ci ...
... Revised locations are computed for a number of historic earthquakes. Most hypocenters are concentrated in older terranes bordering the Mesozoic Newark basin in the Reading, Manhattan, and Trenton prongs and in similar rocks found at a shallow depth beneath the coastal plain from south of New York Ci ...
Earthquake Depth-Energy Release: Thermomechanical Implications
... the rate of thermal dissipation is higher than mechanical dissipation, so that heat will be conducted readily ...
... the rate of thermal dissipation is higher than mechanical dissipation, so that heat will be conducted readily ...
The electrical resistivity structure of the crust beneath the northern
... numbers can be matched to positions along the profile from the map showing the MED directions in Figure 2 and the 2D model presented in Figure 4. The DC resistivity data were modelled with plane layers overlying an infinite halfspace. The resultant models were then used to predict high-frequency MT ...
... numbers can be matched to positions along the profile from the map showing the MED directions in Figure 2 and the 2D model presented in Figure 4. The DC resistivity data were modelled with plane layers overlying an infinite halfspace. The resultant models were then used to predict high-frequency MT ...
Earthquake distribution in southern Tibet and its tectonic implications
... faldersons.net/Software/Hypoinverse/Hypoinverse.html) for the analysis of all the events from STA/LTA ratio checking to obtain a single event location (SEL) list. Here, Zhu and Helmberger’s [1996] model was selected as the reference 1-D velocity model since it has been used in their waveform simulat ...
... faldersons.net/Software/Hypoinverse/Hypoinverse.html) for the analysis of all the events from STA/LTA ratio checking to obtain a single event location (SEL) list. Here, Zhu and Helmberger’s [1996] model was selected as the reference 1-D velocity model since it has been used in their waveform simulat ...
Tsunami
... When EQ considered capable of generating tsunami, send warning with estimated arrival time Once tsunami hits somewhere, tsunami watch established to monitor tide gauges and ocean buoys ...
... When EQ considered capable of generating tsunami, send warning with estimated arrival time Once tsunami hits somewhere, tsunami watch established to monitor tide gauges and ocean buoys ...
Paper - Stanford University
... change to the depth of the brittle-ductile boundary. The updoming correlates with signs of geothermal activity on the surface, a low Pwave velocity anomaly at 5-8 km depth (Franco 2013) and a low resistivity anomaly at 1.5-5.0 km depth (Hersir, Árnason and Vilhjálmsson 2013). No earthquake activity ...
... change to the depth of the brittle-ductile boundary. The updoming correlates with signs of geothermal activity on the surface, a low Pwave velocity anomaly at 5-8 km depth (Franco 2013) and a low resistivity anomaly at 1.5-5.0 km depth (Hersir, Árnason and Vilhjálmsson 2013). No earthquake activity ...
Louie-USC111006 - The Nevada Seismological Laboratory
... The Department of Geological Sciences and Engineering seeks a full time tenure-track assistant professor of Geological Engineering. The chosen candidate must be committed to both undergraduate and graduate instruction and will be expected to develop an externally funded program of research in their ...
... The Department of Geological Sciences and Engineering seeks a full time tenure-track assistant professor of Geological Engineering. The chosen candidate must be committed to both undergraduate and graduate instruction and will be expected to develop an externally funded program of research in their ...
fault-related carbonate rocks and earthquake indicators
... produced during the high temperature pulses achieved during seismic slip and may be preserved in the geological record. These results are of outstanding importance because they suggest that the study of exhumed faults may reveal the ancient seismicity of a fault, thus yielding a wealth of informatio ...
... produced during the high temperature pulses achieved during seismic slip and may be preserved in the geological record. These results are of outstanding importance because they suggest that the study of exhumed faults may reveal the ancient seismicity of a fault, thus yielding a wealth of informatio ...
Energy-based damage index for steel structures
... Jirsa 2005, Rodriguez and Padilla 2008). However, there is a challenge to study and calibrate the use of such indices for the practical structural evaluation of complex structures. Within this context, an energy-based damage index which explicitly accounts for the effects of cumulative plastic defor ...
... Jirsa 2005, Rodriguez and Padilla 2008). However, there is a challenge to study and calibrate the use of such indices for the practical structural evaluation of complex structures. Within this context, an energy-based damage index which explicitly accounts for the effects of cumulative plastic defor ...
Detecting fractures using time-lapse 3C-3D seismic data
... might exist in the Dawson Bay Formation, one is outlined by blue circles and the other is shown in red circles. The area of change (red circle) is also observed on the PP and PS data in FIG 9 and FIG 10, respectively. An evident push-down effect can be seen in this region. To investigate the time sh ...
... might exist in the Dawson Bay Formation, one is outlined by blue circles and the other is shown in red circles. The area of change (red circle) is also observed on the PP and PS data in FIG 9 and FIG 10, respectively. An evident push-down effect can be seen in this region. To investigate the time sh ...
Seismic Anisotropy: Tracing Plate Dynamics in the Mantle
... is possible from strong variations of ␦t and with the approach azimuth and incidence angle of the shear wave (58). Such variation was first found at observation points proximal to the San Andreas Fault in California. Fast polarization in the upper layer, perhaps most affected by the brittle deform ...
... is possible from strong variations of ␦t and with the approach azimuth and incidence angle of the shear wave (58). Such variation was first found at observation points proximal to the San Andreas Fault in California. Fast polarization in the upper layer, perhaps most affected by the brittle deform ...
Lamarque_Arlita_SKS_RF_GJI_201
... GEOSCOPE station DRV provided continuous data digitized at 20 Hz since 1986, first from an STS-1 sensor that was subsequently replaced by an STS-2 sensor on 2010 February 6. The temporary deployment provided 8–18 months of continuous data that we use in this study (Table 1). This group of stations h ...
... GEOSCOPE station DRV provided continuous data digitized at 20 Hz since 1986, first from an STS-1 sensor that was subsequently replaced by an STS-2 sensor on 2010 February 6. The temporary deployment provided 8–18 months of continuous data that we use in this study (Table 1). This group of stations h ...
Tectonic Geomorphology and Paleoseismology
... collapse and a few collapse completely. Windows shatter. ...
... collapse and a few collapse completely. Windows shatter. ...
Crystal preferred orientation of an amphibole experimentally
... mphibolites are considered one of the dominant rocks in the middle crust1, lower crust2 and deep crust of continental arcs3, where hydrous fluids are fluxed from the subducting slab and the water contents of underplating magmas are high2. As the primary anisotropic phase of amphibolite, amphibole is a ...
... mphibolites are considered one of the dominant rocks in the middle crust1, lower crust2 and deep crust of continental arcs3, where hydrous fluids are fluxed from the subducting slab and the water contents of underplating magmas are high2. As the primary anisotropic phase of amphibolite, amphibole is a ...
Seismotectonic modeling of the repeating Katsuhiko Ishibashi
... inferred to have been subducted at the Sagami trough, without any jump of the surface boundary, throughout the entire period of subduction. The net duration of the subduction is estimated at 7 ∼ 8 million years, if we assume the same relative velocity as the present one, 3 cm/yr (Seno et al., 1993), ...
... inferred to have been subducted at the Sagami trough, without any jump of the surface boundary, throughout the entire period of subduction. The net duration of the subduction is estimated at 7 ∼ 8 million years, if we assume the same relative velocity as the present one, 3 cm/yr (Seno et al., 1993), ...
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.