Western Gulf of Corinth & Central Ionian Islands Seismic Hazard Dataset

Description 1. Introduction The dataset compiles Probabilistic Seismic Hazard Assessment (PSHA) results from Kaviris et al. (2022) and Kaviris et al. (2024). Both studies use the classical Cornell–McGuire approach (Cornell, 1988; McGuire, 1976). Kaviris et al. (2022) carry out a Probabilistic Seismic Hazard Assessment (PSHA) for the Western Gulf of Corinth (WGoC). Results are presented in the form of Peak Ground Acceleration (PGA, cm/s²) and Peak Ground Velocity (PGV, cm/s) for 475 and 950-year return period. Moreover, the study presents PGA hazard curves (cm/s²) and Uniform Hazard Spectra (UHS, cm/s²) for the major towns Aigion, Patras, and Nafpaktos. In a subsequent study, Kaviris et al. (2024) adopt the same conceptual approach for the example of the Central Ionian Islands (CIIs), i.e. Cephalonia and Ithaca, and generate analogous output for the townships of Lixouri, Argostoli, and Vathi. 2. Files The dataset contains PGA, PGV, UHS and hazard curve data from both studies in easily parsable CSV formats. All files share a standardized long format: one row per node, intensity measure and hazard estimate, with self-describing hazard and metadata fields. Following, the common data structure and the summary of each file with its file-specific fields are presented. 2.1 Common data structure All CSV files contain the following fields: node_id: Node identifier (string). node_longitude_deg: Longitude in decimal degrees (WGS84) (float). node_latitude_deg: Latitude in decimal degrees (WGS84) (float). hazard_im_type: Intensity measure type (PGA, PGV or Sa) (string). hazard_statistic: Statistic of the hazard estimate (e.g. mean) (string). hazard_value: Value of the intensity measure (float). hazard_unit: Unit of hazard_value (e.g. cm/s**2) (string). meta_source_models: Seismic source models used (semicolon-separated) (string). meta_gmm_models: Ground motion models used (semicolon-separated) (string). meta_focal_mechanisms: Treatment of focal mechanisms (string). meta_site: Site conditions (string). meta_publication_doi: DOI of the associated publication (string). meta_dataset_doi: DOI of this dataset (string). 2.2 Western Gulf of Corinth 2.2.1 wgoc_intensity_measurement_levels.csv Contains gridded seismic hazard simulation output for WGoC. Estimated Peak Ground Acceleration (PGA) and Peak Ground Velocity (PGV) for two return periods (475 and 950 years). File-specific fields: hazard_return_period_yr: Return period in years (integer). 2.2.2 wgoc_hazard_curves.csv Contains the PGA hazard curves for Aigion, Nafpaktos and Patras. File-specific fields: hazard_poe: Probability of exceedance (float). hazard_timeframe: Timeframe of the probability of exceedance in years (integer). 2.2.3 wgoc_uhs.csv Contains the UHS for Aigion, Nafpaktos and Patras. File-specific fields: hazard_return_period_yr: Return period in years (integer). hazard_period_s: Spectral period in s (float). 2.3 Central Ionian Islands 2.3.1 cii_intensity_measurement_levels.csv Contains gridded seismic hazard simulation output for CIIs. Estimated PGA and PGV for two return periods (475 and 950 years). File-specific fields: hazard_return_period_yr: Return period in years (integer). 2.3.2 cii_hazard_curves.csv Contains the PGA hazard curves for Lixouri, Argostoli and Vathi. File-specific fields: hazard_poe: Probability of exceedance (float). hazard_timeframe: Timeframe of the probability of exceedance in years (integer). 2.3.3 cii_uhs.csv Contains the UHS for Lixouri, Argostoli and Vathi. File-specific fields: hazard_return_period_yr: Return period in years (integer). hazard_period_s: Spectral period in s (float). 2.4 Additional files LICENSE: CC-BY-SA-4.0 legal code. README.md: The current README file. Keywords Geophysics Seismology Probabilistic Seismic Hazard Assessment Changelog v1.1.0: All data files harmonized into a standardized long format with explicit hazard and metadata fields. v1.0.0: Initial release. Contact Name: Angelos Zymvragakis Email: [e-mail] Affiliation: National and Kapodistrian University of Athens