PEER NGA-East database

Abstract

This article documents the earthquake ground motion database developed for the NGA-East Project, initiated as part of the Next Generation Attenuation (NGA) research program and led by the Pacific Earthquake Engineering Research Center (PEER). The project was focused on developing a ground motion characterization model (GMC) model for horizontal ground motions for the large region referred to as Central and Eastern North America (CENA). The CENA region covers most of the U.S. and Canada, from the Rocky Mountains to the Atlantic Ocean and is characterized tectonically as a stable continental region (SCR). The ground-motion database includes the two- and three-component ground-motion recordings from numerous selected events relevant to CENA ( M > 2.5, with distances up to 3500 km) that have been recorded since 1976. The final database contains over 27,000 time series from 82 earthquakes and 1271 recording stations. The ground motion database includes uniformly processed time series, 5% damped pseudo-spectral acceleration (PSA) median-component ordinates for 429 periods ranging from 0.01 to 10 s, duration and Arias intensity in 5% increments, and Fourier amplitude spectra for different time windows. Ground motions and metadata for source, path, and site conditions were subjected to quality checks by topical working groups and the ground-motion model (GMM) developers. The NGA-East database constitutes the largest database of processed recorded ground motions in SRCs and is publicly available from the PEER ground-motion database website.

Seismic Wave Attenuation Characteristics from the Ground Motion Spectral Analysis around the Kanto Basin

“…Each record was processed by baseline correction and a Butterworth bandpass filter. The high-cut corner frequency (f hc ) was uniformly set to 25 Hz lower than the Nyquist frequency, while the low-cut corner frequency (f lc ) was determined according to the quality of each record, such as the signal-to-noise ratio (SNR) [37,38] and the low-frequency spectral shape of the Fourier amplitude spectrum (FAS), as suggested by Goulet et al [39]. Figure 2a shows an example of how to pick up the S-wave window and Pre-P wave noise window.…”

Relational database used for ground-motion model development in the NGA-sub project

“…We describe the data sources, briefly review data processing steps, summarize intensity measure computation and database attributes, describe the development of quality flags, and present how the ground motion data (time series and intensity measures) are organized within the structure of the relational database. The procedures for ground motion processing and intensity measure calculation are equivalent to those applied in the NGA-East project (Goulet et al, 2021). Further information regarding their application with the NGA-Sub data are provided in Kishida et al (2020).…”

“…The data processing performed for NGA-Sub, which is procedurally equivalent to the data processing for NGA-East (Goulet et al, 2021), represents the most recent evolution of these procedures. Relative to the procedures applied in NGA-West1 and NGA-West2, minor changes were made in relation to filtering, baseline correction, and computation of Fourier Amplitude Spectra.…”

“…Further information on the NGA-Sub data processing is provided in Kishida et al (2020). These procedures are not repeated here for the sake of brevity, because of the similarity to some prior documents (Ancheta et al, 2014; Chiou et al, 2008; Darragh et al, 2004; Douglas and Boore, 2011), and because of and the equivalence to procedures described by Goulet et al (2021).…”

“…We also briefly describe the ground motions assembled for the project, which were selected and processed using well-established procedures from prior NGA projects (e.g. Goulet et al, 2021). We describe how data were checked for potential errors and flagged.…”