Showing papers in "Earthquake Spectra in 2014"
TL;DR: In this article, ground motion prediction equations for computing median and standard deviations of average horizontal component intensity measures (IMs) for shallow crustal earthquakes in active tectonic regions were provided.
Abstract: We provide ground motion prediction equations for computing medians and standard deviations of average horizontal component intensity measures (IMs) for shallow crustal earthquakes in active tecton...
1,024 citations
TL;DR: In this article, the authors used an expanded PEER NGA-West2 database to develop a new ground motion prediction equation (GMPE) for the average horizontal components of PGA, PGV, and 5% damped linear pseudo-absolute accelerations.
Abstract: We used an expanded PEER NGA-West2 database to develop a new ground motion prediction equation (GMPE) for the average horizontal components of PGA, PGV, and 5% damped linear pseudo-absolute acceler...
803 citations
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TL;DR: The NGA-West2 project database as mentioned in this paper includes ground motion data recorded from shallow crustal earthquakes in active tectonic regimes post-2000 and a set of small-t...
Abstract: The NGA-West2 project database expands on its predecessor to include worldwide ground motion data recorded from shallow crustal earthquakes in active tectonic regimes post-2000 and a set of small-t...
800 citations
TL;DR: In this article, the average horizontal component from shallow crustal earthquakes in active tectonic regions is derived using the PEER NGA-West2 database using a ground motion model.
Abstract: Empirical ground motion models for the average horizontal component from shallow crustal earthquakes in active tectonic regions are derived using the PEER NGA-West2 database. The model is applicabl...
749 citations
TL;DR: In this paper, the authors present an update to the NGA model for predicting horizontal ground motion amplitudes caused by shallow crustal earthquakes occurring in active tectonic environments, which is based on their previous work.
Abstract: We present an update to our 2008 NGA model for predicting horizontal ground motion amplitudes caused by shallow crustal earthquakes occurring in active tectonic environments. The update is based on...
737 citations
TL;DR: An empirical model for estimating the horizontal pseudo-absolute spectral accelerations (PSA) generated by shallow crustal earthquakes was published in 2008 using the recorded earthquake ground motes.
Abstract: An empirical model for estimating the horizontal pseudo-absolute spectral accelerations (PSA) generated by shallow crustal earthquakes was published in 2008 using the recorded earthquake ground mot...
407 citations
University of California, Berkeley1, Pacific Gas and Electric Company2, University of Western Ontario3, Stanford University4, United States Geological Survey5, California Department of Transportation6, San Diego State University7, Bechtel8, University of California, Davis9, California Earthquake Authority10, University of California, Los Angeles11, Amec Foster Wheeler12
TL;DR: The NGA-West2 project is a large multidisciplinary, multi-year research program on the Next Generation Attenuation (NGA) models for shallow crustal earthquakes in active tectonic regions as discussed by the authors.
Abstract: The NGA-West2 project is a large multidisciplinary, multi-year research program on the Next Generation Attenuation (NGA) models for shallow crustal earthquakes in active tectonic regions. The resea...
390 citations
TL;DR: In this article, a complete photographic report collected in the epicentral zone shows the seismic vulnerability of precast structures, the damage to which is mainly caused by connection systems, such as the loss of support of structural horizontal elements, due to the failure of friction beam-tocolumn and roof-to-beam connections, or the collapse of the cladding panels.
Abstract: On 20 and 29 May 2012, two earthquakes of MW5.9 and MW5.8 occurred in the Emilia region of northern Italy, one of the most developed industrial centers in the country. A complete photographic report collected in the epicentral zone shows the seismic vulnerability of precast structures, the damage to which is mainly caused by connection systems. Indeed, the main recorded damage is either the loss of support of structural horizontal elements, due to the failure of friction beam-to-column and roof-to-beam connections, or the collapse of the cladding panels, due to the failure of the panel-to-structure connections. The damage can be explained by the intensity of the recorded seismic event and by the exclusion of the epicentral region from the seismic areas recognized by the Italian building code up to 2003. Simple considerations related to the recorded acceleration spectra allow motivating the extensive damage due to the loss of support.
179 citations
TL;DR: In this paper, a site amplification model that captures ground motion scaling with VS30 and soil nonlinear effects was developed to analyze NGA-West2 data and simulations to develop a site amplify model.
Abstract: We analyze NGA-West2 data and simulations to develop a site amplification model that captures ground motion scaling with VS30 and soil nonlinear effects We parameterize nonlinearity as the gradien
174 citations
TL;DR: Christchurch, New Zealand, experienced four major earthquakes (Mw 5.9 to 7.1) since 4 September 2010 that triggered localized to widespread liquefaction.
Abstract: Christchurch, New Zealand, experienced four major earthquakes (Mw 5.9 to 7.1) since 4 September 2010 that triggered localized to widespread liquefaction. Liquefaction caused significant damage to r...
148 citations
TL;DR: In this paper, a software tool for computer-aided displacement-spectrum-compatible real ground motion record selection was developed for the selection of displacement spectrum compatible real ground motions, with special reference to Italy.
Abstract: The increasing interest in performance-based earthquake engineering has promoted research on the improvement of hazard-consistent seismic input definition and on advanced criteria for strong motion record selection to perform nonlinear time history analyses. Within the ongoing research activities to improve the representation of seismic actions and to develop tools as a support for engineering practice, this study addresses the selection of displacement-spectrum-compatible real ground motions, with special reference to Italy. This involved (1) the definition of specific target displacement spectra for Italian sites, constrained—both at long and short periods—by results of probabilistic seismic hazard analyses; (2) the compilation of a high-quality strong ground motion database; and (3) the development of a software tool for computer-aided displacement-based record selection. Application examples show that sets of unscaled, or lightly scaled, accelerograms with limited record-to-record spectral variability can also easily be obtained when a broadband spectral compatibility is required. [DOI:
TL;DR: In this article, the median ground motion values from the NGA-West2 GMPEs were compared for a suite of deterministic cases, and the results showed that median ground moti...
Abstract: A presentation of the model parameters and comparison of the median ground-motion values from the NGA-West2 GMPEs is presented for a suite of deterministic cases. In general, the median ground moti...
TL;DR: The 2010-2011 Canterbury earthquakes in New Zealand revealed improved structural response resulting from historical design advancements, but poor structural performance due to previously identi cation as discussed by the authors, due to previous identici cation.
Abstract: The 2010–2011 Canterbury earthquakes in New Zealand revealed (1) improved structural response resulting from historical design advancements, (2) poor structural performance due to previously identi...
TL;DR: In this article, the authors explore key aspects of underground pipeline network response to the Canterbury earthquake sequence in Christchurch, New Zealand, including the response of the water and wastewater distr...
Abstract: This paper explores key aspects of underground pipeline network response to the Canterbury earthquake sequence in Christchurch, New Zealand, including the response of the water and wastewater distr...
TL;DR: In this paper, the authors analyzed the performance of a hospital system using a holistic and multidisciplinary approach, and collected data on impacts to the hospital system through a standardized survey tool.
Abstract: The paper analyzes the performance of a hospital system using a holistic and multidisciplinary approach. Data on impacts to the hospital system were collected using a standardized survey tool. A fa...
TL;DR: The progressive damage and subsequent demolition of unreinforced masonry (URM) buildings arising from the Canterbury earthquake sequence is reported in this article, where the benefit of seismic improvement techniques that had been installed to URM buildings is shown by the reduced damage ratios reported for increased levels of retrofit.
Abstract: The progressive damage and subsequent demolition of unreinforced masonry (URM) buildings arising from the Canterbury earthquake sequence is reported. A dataset was compiled of all URM buildings located within the Christchurch CBD, including information on location, building characteristics, and damage levels after each major earthquake in this sequence. A general description of the overall damage and the hazard to both building occupants and to nearby pedestrians due to debris falling from URM buildings is presented with several case study buildings used to describe the accumulation of damage over the earthquake sequence. The benefit of seismic improvement techniques that had been installed to URM buildings is shown by the reduced damage ratios reported for increased levels of retrofit. Demolition statistics for URM buildings in the Christchurch CBD are also reported and discussed.
TL;DR: The NGA-West2 site database (SDB) contains information on site condition and instrument housing for 4,147 strong-motion stations with recordings in the project flatfile as discussed by the authors.
Abstract: The NGA-West2 site database (SDB) contains information on site condition and instrument housing for 4,147 strong-motion stations with recordings in the project flatfile. The stations are from activ...
TL;DR: The 2010-2011 Canterbury earthquake sequence began with the 4 September 2010, Mw7.1 Darfield earthquake and includes up to ten events that induced liquefaction.
Abstract: The 2010–2011 Canterbury earthquake sequence began with the 4 September 2010, Mw7.1 Darfield earthquake and includes up to ten events that induced liquefaction. Most notably, widespread liquefactio...
TL;DR: An overview of the ground motion and seismic source aspects of the Canterbury earthquake sequence can be found in this paper, where common reported attributes among the largest earthquakes in this sequence are the following:
Abstract: This paper provides an overview of the ground motion and seismic source aspects of the Canterbury earthquake sequence. Common reported attributes among the largest earthquakes in this sequence are ...
TL;DR: The NGA-West2 research program, coordinated by the Pacific Earthquake Engineering Research Center (PEER), is a major effort to produce refined models for predicting ground motion response spectra as mentioned in this paper.
Abstract: The NGA-West2 research program, coordinated by the Pacific Earthquake Engineering Research Center (PEER), is a major effort to produce refined models for predicting ground motion response spectra. ...
TL;DR: The NGA-West2 ground motion prediction equations (GMPEs) as discussed by the authors were developed as a collaborative effort with many interactions and exchange of ideas among the developers, including the NGA and NASA.
Abstract: The development of the NGA-West2 ground motion prediction equations (GMPEs) is a collaborative effort with many interactions and exchange of ideas among the developers. The NGA-West2 developers ind...
TL;DR: The Canterbury earthquake sequence provides an exceptional opportunity to investigate the effects of varying degrees of liquefaction on the built environment as discussed by the authors, and many multistory buildings in the Centr...
Abstract: The Canterbury earthquake sequence provides an exceptional opportunity to investigate the effects of varying degrees of liquefaction on the built environment. Many multistory buildings in the Centr...
TL;DR: The state-of-the-art in seismic network reliability assessment of highway bridges often ignores bridge failure correlations imposed by factors such as the network topology, construction method, etc. as discussed by the authors.
Abstract: The state-of-the-practice in seismic network reliability assessment of highway bridges often ignores bridge failure correlations imposed by factors such as the network topology, construction method...
TL;DR: In this article, the nonlinear soil amplification models developed by Walling et al. (2008) are revisited for three main reasons: (a) the simulation database on which the models were developed has been updated and (b)...
Abstract: The nonlinear soil amplification models developed by Walling et al. (2008) are revisited for three main reasons: (a) the simulation database on which the models were developed has been updated and ...
TL;DR: Comparisons of maps of the directivity amplification suggest that the predicted geographic distributions of directivity amplified are dominated by effects of the models’ assumptions, and more than one model should be used for ruptures dipping less than about 65 degrees.
Abstract: Five directivity models have been developed based on data from the NGA-West2 database and based on numerical simulations of large strike-slip and reverse-slip earthquakes. All models avoid the use ...
TL;DR: When communities are highly insured, much of that loss transfers to the insurer as discussed by the authors. But this is not the case in many natural disasters such as the 2010 and 2011 Haiti earthquakes.
Abstract: Earthquakes generate loss only when assets are near enough to be significantly shaken. When communities are highly insured, much of that loss transfers to the insurer. Many events in the 2010–2011 ...
TL;DR: From late-2010 to mid-2011, Christchurch suffered a series of earthquakes and aftershocks that affected the city's power supply as discussed by the authors, and the most relevant of these events occurred on 4 September 2010, 22 F...
Abstract: From late-2010 to mid-2011, Christchurch suffered a series of earthquakes and aftershocks that affected the city's power supply. The most relevant of these events occurred on 4 September 2010, 22 F...
TL;DR: New time-dependent seismicity models for the Christchurch region reflect the greatly enhanced seismicity in the region at present, and the gradual decrease of the seismicity over the next few decad...
Abstract: New time-dependent seismicity models for the Christchurch region reflect the greatly enhanced seismicity in the region at present, and the gradual decrease of the seismicity over the next few decad...
TL;DR: In this article, the relation between resilience and water system serviceability is discussed, and the dependence of community resilience on water system resilience is illustrated, and five normally provided water system services are compared.
Abstract: This paper illustrates the relation between resilience and water system serviceability, and the dependence of community resilience on water system resilience. Five normally provided water system se...
TL;DR: The Canterbury earthquakes, which involved widespread damage in the February 2011 event and ongoing aftershocks near the Christchurch central business district (CBD), presented decision makers with a variety of challenges as mentioned in this paper.
Abstract: The Canterbury earthquakes, which involved widespread damage in the February 2011 event and ongoing aftershocks near the Christchurch central business district (CBD), presented decision makers with