Intensity-ground motion data set for Italy (INGe) version 2.0

An updated and homogeneous earthquake data set for Italy compiled by joining the Italian Macroseismic Database DBMI15 and the Engineering Strong-Motion (ESM) accelerometric data bank. The database has been compiled through an extensive procedure of selection and revision based on two main steps: 1) the removal of several earthquakes in DBMI15 because the data source has been considered to be largely unreliable in the estimation of the macroseismic intensities and 2) the extraction of all the localities reporting intensity data which are located within 3 km from the accelerograph stations that recorded the data.

The final data set includes 519 recordings from 65 earthquakes and 227 stations in the time span 1972-2016. The events are characterized by moment magnitudes in the range 4.1-6.8 and depths in the range 0-55 km.

Here, we illustrate the data collection and the properties of the database in terms of recording, event and station distributions as well as macroseismic intensity points. Furthermore, we list the most relevant features of engineering interest showing several statistics with reference to the most significant metadata (such as moment magnitude, several distance metrics, style of faulting etc).

HEADER EXPLANATION

• event_id: id of the event in ESM (http://esm.mi.ingv.it);
• INGV_ev_id: event id in the bulletin of the Istituto Nazionale di Geofisica e Vulcanologia (INGV, http://cnt.rm.ingv.it);
• event_time: time of the event (format YYYY-MM-DD HH:MM:SS);
• ev_latitude and ev_longitude: geographic coordinates (decimal degrees) of the epicenter of the event;
• ev_depth: depth of the hypocenter of the event (km);
• erh: horizontal error (km);
• erz: vertical error (km);
• ev_hyp_ref: reference for ev_latitude, ev_longitude and ev_depth  (CPTI https://emidius.mi.ingv.it/CPTI15-DBMI15/; INGV_W  INGV-webservice http://webservices.rm.ingv.it; CSI Catalogo della Sismicità Italiana https://csi.rm.ingv.it/; GEM ISC-GEM Global Instrumental Earthquake Catalogue http://www.isc.ac.uk/iscgem/; ETNA1 Mt. Etna Seismic Catalog 2000-2010 http://sismoweb.ct.ingv.it/Etna/catalogs/2000_2010/; ETNA 2 Mt. Etna Seismic Catalog 2011-2013 http://sismoweb.ct.ingv.it/Etna/catalogs/2011_2013/; SL Slejko, D., Neri, G., Orozova, I., Renner, G., & Wyss, M. (1999). Stress Field in Friuli (NE Italy) from Fault Plane Solutions of Activity Following the 1976 Main Shock. Bulletin of the Seismological Society of America, 89(4), 1037–1052. BSING: Istituto Nazionale di Geofisica. Bollettino sismico mensile.)
• fm_type_code: style of faulting (NF normal fault; TF reverse fault; SS strike-slip fault; O oblique fault; U undefined).
• Mw: moment magnitude;
• erMw: uncertainty of Mw;
• Mw_ref: reference for Mw estimate (H: The Homogenized Instrumental Seismic Catalog (HORUS));
• network_code: code associated with the recording network according to the International Federation of Seismograph Network (http://www.fdsn.org);
• st_code: 3 to 5 characters associated to the station;
• st_latitude and st_longitude: geographic coordinates (decimal degrees) of the station;
• ec8_code: EC8 site category (CEN, 2003) (the subsoil class values are marked with an asterisk when they were assessed only by the surface geology)
• st_vs30: vS30 associated to the station (m/s);
• st_vs30_ type: type of method used to estimate st_vs30 (meas: average shear wave velocity vS,30 (CEN, 2003) from in-situ measurements (m/s); calc: extracted vS30 from the vS30 grid adopted by ShakeMap (Michelini et al., 2020);
• st_to_ev_dist: station-to-event distance (km);
• st_to_ev_dist_ type: type of st_to_ev_dist (RJB: distance computed from the surface projection of the fault; REPI: distance from epicentre of the event); 
• epi_az: event-to-station azimuth (degrees);
• PlaceID: id of the locality to which each macroseismic data point is referring to;
• Placename:  place name of the locality to which each macroseismic data point is referring to;
• Lat and Lon: geographic coordinates (decimal degrees) of the macroseismic data point;
• Int: macroseismic intensity associated to the macroseismic data point;
• Int_dec: corresponding decimal value of Int, used internally for graphing, and based on the DBMI15 manual (https://emidius.mi.ingv.it/CPTI15-DBMI15/description_DBMI15_en.htm) ;
• erInt: uncertainty of Int;
• Int_type: type of macroseismic scale used to estimate Int (MCS: Mercalli‐Cancani‐Sieberg scale (Sieberg, 1930); EMS-98: European Macroseismic Scale (Grünthal, 1998));
• st_to_MDP_dist: station-to-macroseismic data point distance (km);
• ev_to_MDP_dist: epicenter-to- macroseismic data point distance (km);
• Max_PGA and Max_PGV: maximum among the two horizontal components of peak ground acceleration (cm/s2) and peak ground velocity (cm/s);
• Max_TO_300, Max_T1_000 and Max_T3_000: maximum among the two horizontal components of peak response spectral acceleration amplitudes at 0.3, 1.0, and 3.0 s (cm/s2).