Chile Strong Ground Motion Flatfile

The Nazca-South American plate boundary produces large magnitude events (Mw > 8) every 20 years in the coast of Chile. This work describes a public ground motion database that contains 3572 records from 477 earthquakes, and 181 seismic stations, which includes the recent 2015 Mw 8.3 Illapel earthquake. The dataset 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 (Rrup), epicentral (Repi), and hypocentral (Rhyp) distances, with a range for Rrup from 20 to 650 kms. Site characterization is based on Vs30, ranging from 110 to 1951 m/s. Intensity measures included are peak ground acceleration, spectral acceleration values from 0.01 to 10s, Arias Intensity, and peak ground velocity. Each record was uniformly processed component by component, filtering of each component to ensure that the entire database has the same level of noise (i.e. fixing the maximum level of signal-to-noise ratio). Some of the relevant data included in the database are: • Pseudo acceleration ordinates from 0.01 to 10 seconds. Peak ground velocity and acceleration, Arias Intensity, and duration metrics. • Mw as reported by NEIC and CMT, along with other magnitude scales. • Site characterization based on measured shear-wave velocity (i.e. Vs30) when available. Site’s dominant frequency and topographic slope are reported for all stations. • Different source to site distance metrics, including epicentral, hypocentral, and closest distance to fault rupture (for interface events). • Metadata for each record, which includes segregation of dependent and independent events, using two different approaches.