Ground-motion dataset for shallow earthquakes in Colombia

Abstract

Abstract. The tectonics of Colombia is characterised by the interaction of multiple oceanic plates subducting beneath the continent, generating active transpressional deformation and a wide range of subduction-related and crustal earthquakes. We present a flatfile containing ground-motion intensity measurements from 694 shallow earthquakes. The dataset includes 8,086 three-component acceleration records that were uniformly processed. The computed IMs include peak ground velocity, peak ground acceleration, and 5 %-damped spectral accelerations for 31 periods ranging from 0.01 to 8 s. Furthermore, the Fourier Amplitude Spectra for each component is provided in the frequency range from 0.04 to 30 Hz. Epicentral and hypocentral distances are reported for all events, while finite-fault distance metrics are estimated for earthquakes with M > 5.5. Site conditions are characterised using VS30 and the horizontal-to-vertical spectral ratio (H/V). Hypocentre locations are constrained using the ISC-EHB catalogue and the Integrated Seismological Catalogue of the Colombian Geological Survey. For validation and consistency checks, the dataset was compared to a global and region-adapted Ground Motion Prediction Model. This flatfile constitutes a valuable resource for seismic hazard analysis, ground-motion modelling, risk assessment, earthquake engineering applications, seismic-site response and source physics characterization in Colombia, surrounding regions, and other comparable tectonic environments.