Showing papers by "David M. Boore published in 2021"
TL;DR: This paper developed semi-empirical ground motion models for peak ground acceleration, peak ground velocity, and 5-damped pseudo-spectral acceleration for periods from 0.01 to 10
Abstract: We develop semi-empirical ground motion models (GMMs) for peak ground acceleration, peak ground velocity, and 5%-damped pseudo-spectral accelerations for periods from 0.01 to 10 s, for the median o...
32 citations
TL;DR: In this article, a ground motion prediction model (GMPM) for horizontal-component peak ground velocity, peak ground acceleration, and 5% damped pseudoacceleration response spectra, at 105 periods ranging from 0.01 to 10.
Abstract:
Using a recently completed database of uniformly processed strong-motion data recorded in Greece, we derive a ground-motion prediction model (GMPM) for horizontal-component peak ground velocity, peak ground acceleration, and 5% damped pseudoacceleration response spectra, at 105 periods ranging from 0.01 to 10 s. The equations were developed by modifying a global GMPM, to account for more rapid attenuation and weaker magnitude scaling in the Greek ground motions than in the global GMPM. Our GMPM is calibrated using the Greek data for distances up to 300 km, magnitudes from 4.0 to 7.0, and time-averaged 30 m shear-wave velocities from 150 to 1200 m/s. The GMPM has important attributes for hazard applications including magnitude scaling that extends the range of applicability to M 8.0 and nonlinear site response. These features are possible because they are well constrained by data in the global GMPM from which our model is derived. An interesting feature of the Greek data, also observed previously in studies of mid-magnitude events (6.1–6.5) in Italy, is that they are substantially overpredicted by the global GMPM, which may be a repeatable regional feature, but may also be influenced by soil–structure interaction. This bias is an important source of epistemic uncertainty that should be considered in hazard analysis.
20 citations
28 Jun 2021
TL;DR: Kishida et al. as discussed by the authors presented a ground motion database consisting of two and three-component ground motion recordings from selected earthquakes in subduction zones, which includes PGA, PGV, pseudo-spectral acceleration for eleven damping values between 0.5% and 30%, Fourier amplitude spectra for frequencies from 0.1 to 100 Hz, and significant-shaking durations based on Arias intensity.
Abstract: Author(s): Kishida, Tadahiro; Contreras, Victor; Bozorgnia, Yousef; Abrahamson, Norman A; Ahdi, Sean K; Ancheta, Timothy D; Boore, David M; Campbell, Kenneth W; Chiou, Brian SJ; Darragh, Robert B; Gregor, Nicholas; Kuehn, Nico; Kwak, Dong Youp; Kwok, Annie O; Lin, P; Magistrale, Harold; Mazzoni, Silvia; Muin, S; Midorikawa, S; Si, H; Silva, Walter J; Stewart, Jonathan; Wooddell, Katie E; Youngs, Robert R | Abstract: This paper summarizes a ground-motion database developed for the NGA-Sub Project. The database consists of two- and three-component ground-motion recordings from selected earthquakes in subduction zones. The database also includes the supporting data such as source, path, and site metadata. The earthquakes are located in Japan, Taiwan, the Pacific Northwest region of North America, Alaska, Mexico, Central and South America, and New Zealand. The events in the database are classified as interface, intraslab, or outer-rise, and have magnitudes ranging from 4 to 9. The database includes more than 71,000 three-component recordings, most of which are from digital accelerograms. The database includes PGA, PGV, pseudo-spectral acceleration for eleven damping values between 0.5% and 30%, Fourier amplitude spectra for frequencies from 0.1 to 100 Hz, and significant-shaking durations based on Arias Intensity. These data are analyzed in the project to model various ground-motion properties.
16 citations
TL;DR: The combined ground motion, seismic source, and site database is anticipated to be useful for engineering applications, including ground-motion model development and time series selection for response-history.
Abstract:
We present a Hellenic database of intensity measures from uniformly processed strong ground motion recordings, together with metadata on earthquake source attributes and recording site conditions. The database consists of information from 471 earthquakes between 1973 and 2015 that produced 2993 usable recordings from 333 sites. A key element of this work is a unified presentation of data from two major data providers that operate in Greece (Institute of Engineering Seismology and Earthquake Engineering and the Institute of Geodynamics, National Observatory of Athens) along with a university-operated local urban array (University of Patras). Consistent procedures were applied to develop source parameters that include hypocenter locations, moment magnitudes (directly estimated or derived using a conversion procedure), fault-plane solutions, and finite-fault parameters (generally, for events with M>6.0). The time-averaged shear-wave velocity in the upper 30 m parameter is provided for all 333 recording sites based on geophysical measurements where available (102) and proxy-based estimates otherwise. Most events are in the magnitude range of 3.8–7, occurred at shallow hypocentral depths (<30 km), and provide data for rupture distances generally between 10 and 300 km. The combined ground motion, seismic source, and site database is anticipated to be useful for engineering applications, including ground-motion model development and time series selection for response-history analyses.
8 citations
TL;DR: In this article, traditional ground motion models are used to compute pseudo-spectral acceleration (PSA) from future earthquakes and are generally developed by regression of PSA using a physics-based functio...
Abstract: Traditional ground-motion models (GMMs) are used to compute pseudo-spectral acceleration (PSA) from future earthquakes and are generally developed by regression of PSA using a physics-based functio...
6 citations
28 Jun 2021
TL;DR: Scordilis et al. as mentioned in this paper presented an updated Hellenic database of strong ground motion recordings together with the earthquake source properties and the site characterization of the recording stations, covering the period from 1973-2015.
Abstract: Author(s): Scordilis, Emmanouel; Theodoulidis, Nikolaos; Kalogeras, Ioannis; Margaris, Basil; Klimis, Nikolaos; Skarlatoudis`, Andreas; Stewart, Jonathan P; Boore, David M; Seyhan, Emel; Savvaidis, Alexandros; Mylonakis, George; Pelekis, Panagiotis | Abstract: An updated Hellenic database of strong ground motion recordings together with the earthquake source properties and the site characterization of the recording stations are described here. The strong motion database consists of 2751 corrected recordings from 497earthquakes of focal depths hl45km and 338 recording stations, with source to site distances up to 300 km, covering the period from 1973-2015. The strong motion recordings were collected from Hellenic Strong Motion Networks operated by the Institute of Engineering Seismology and Earthquake Engineering (ITSAK), the Institute of Geodynamics, National Observatory of Athens (NOA-IG), as well as from the Civil Engineering Department, University of Patras (UPAN). All recordings were processed based on well-established routines and methodologies applied in worldwide strong motion databases such as the PEER, NGA-West2 database. The final database includes epicenter locations, focal depths, moment magnitudes (directly estimated or equivalently derived after a conversion procedure) for a significant number of earthquakes with Mg4.5and a number of finite fault plane solutions corresponding to earthquakes with Mg6.0. The data is compiled from existing catalogs published by Hellenic and international seismological centers. The properties for each recording station include surface geology, a measured or estimated time-averaged shear wave velocity in the upper 30m (VS30), and information on instrument housing. Out of the 338sites, 75 have in-situ shear wave velocity measurements while for the rest VS30 values are derived from proxy-based relationships based on terrain or geology combined with surface gradient.
2 citations
28 Jun 2021
TL;DR: Park et al. as mentioned in this paper used a combination of data inspection and regression techniques to distinguish path effects in the data, including differences between interface and inslab events, forearc/back-arc effects, regional effects, and azimuthal effects.
Abstract: Author(s): Parker, Grace A; Stewart, Jonathan; Hassani, Behzad; Atkinson, Gail M; Boore, David M | Abstract: The NGA-Subduction Project is a multi-year, multidisciplinary project with the goal of developing a ground motion database and ground motion models for global subduction zone earthquakes including those in Japan, Taiwan, Cascadia, Alaska, New Zealand, South America, and Central America. Our ground motion model development is currently at the stage of identifying regional trends in path terms. We use a combination of data inspection and regression techniques to distinguish path effects in the data, including differences between interface and inslab events, forearc/back-arc effects, regional effects, and azimuthal effects. Our approach to model development is to first develop a path model capturing these effects, then to investigate source and site effects. The parameterization of functional form is guided in part by the scaling expected by a generic equivalent point-source stochastic model. We expect regionalization in path and will investigate further regionalization in site response and in overall model bias.