Chile Strong Ground Motion Flatfile

Abstract

The Nazca-South American plate boundary produces large-magnitude events (Mw > 8) every 20 years on the coast of Chile. This work describes a public ground motion database that contains 3,572 records from 477 earthquakes and 181 seismic stations, which includes the recent 2015 Mw 8.3 Illapel earthquake. The data set is controlled by subduction interface and inslab events. The oldest event included is Valparaiso (1985), and the magnitude span is 4.6–8.8 Mw. The source-to-site distance metrics reported are the closest distance to the rupture plane ( R rup), epicentral ( R epi) and hypocentral ( R hyp) distances, with a range for R rup from 20 to 650 km. Site characterization is based on V S30, ranging from 110 to 1,951 m/s. Intensity measures included are peak ground acceleration, spectral acceleration values from 0.01 to 10 s, Arias intensity, and peak ground velocity. Each record was uniformly processed component by component. A flatfile with the related metadata and the spectral accelerations from processed ground motions is available at NEEShub ( http://doi.org/10.17603/DS2N30J ; Bastías and Montalva 2015 ).

Spectral decomposition of the Engineering Strong Motion (ESM) flat file: regional attenuation, source scaling and Arias stress drop

“…In the framework of engineering seismology, it is common practice to compile parametric tables (referred to as flat files) to disseminate information about earthquakes, recording sites, and strong motion parameters of engineering interest. Examples are the flat file for the development of the Next-Generation ground motion models disseminated by PEER (Ancheta et al 2014), or the flat files compiled for Japan (Dawood et al 2016) and for Chile (Bastías and Montalva 2016). In this study, we focused on the Engineering Strong Motion flat file (ESM-ff) disseminated for hazard studies in Europe (Lanzano et al 2018).…”

Correlations of spectral accelerations in the Chilean subduction zone

“…This study uses a subset of high-quality records from the SIBER-RISK strong motion database (SIBER-RISK, 2019), which combines subduction events form the CSN (Barrientos, 2018) and RENADIC (Bastías and Montalva, 2016) databases. The ground motions in this high-quality subset includes only earthquakes with moment magnitude M ≥ 5.0, site-to-source distance up to 300 km, and records obtained at sites with V s 30 ≥ 360 m/s.…”

Seismic characterization of steel special moment frames subjected to megathrust earthquakes

“…Chile, Japan, etc.). For instance, an actual realization of a MT scenario is the M w = 8 . 8 , 2010 Maule (Chile) earthquake, where ground motions with PGA > 0 . 2 g and PGV > 15 m / s were recorded at 35 km < R rup < 95 km (Bastías and Montalva, 2016). In all scenarios, soil type is characterized by V s 30 = 760 m / s , that is, B/C soil type boundary in ASCE/SEI 7-16 (ASCE, 2017).…”

“…Significant duration in subduction MT earthquakes is computed with the duration GMPE presented in Abrahamson and Silva (1996). While such GMPE is not intended for subduction earthquakes, it was nevertheless selected from several duration GMPEs (Afshari and Stewart, 2016; Bommer et al, 2009; Kempton and Stewart, 2006) because in a separate analysis (not shown here for brevity) it was found to provide the best fit to duration data of 75 Chilean ground motions caused by subduction earthquakes of magnitude 8 . 0 < M w < 8 . 8 reported by Bastías and Montalva (2016). For crustal earthquakes, the Afshari and Stewart (2016) duration GMPE is used.…”