QUaternary fault strain INdicators database: QUIN 1.0 - first release from the Apennines of central Italy

Abstract

This database relates to the paper “QUaternary fault strain INdicators database - QUIN 1.0 - first release from the Apennines of central Italy”. It provides very local-scale geometric and kinematic data on Fault Striation Pairs (FSP, the fault plane and the slickenline measured on it) surveyed along the Quaternary (last 2.5 My) extensional intra-Apennine belt of central Italy. The sampled area develops for an along-strike extent of ~550 km and in an average NW-SE direction. The first release of the “QUaternary fault strain INdicator” database (acronym QUIN) consists of a comprehensive compilation of both unpublished (1315) and published (2026) FSPs, for a total of 3339 records. Overall, considering the ~60,100 numerical data released in this database, the 79.8% are unpublished while the 20.2% are from the previous literature. The FSP data are distributed within ~455 Survey Sites (SS) geolocated along the trace of well-distinct hosting faults. The database is released in a .txt table and as shapefile (.shp) in WGS84 coordinate system. The FSP records are organized in 34 fields, referring to three themes: A) FSP identification and SS location (fields 1 to 12); B) FSP geometry with quality ranking and references (fields 13 to 22); C) FSP deformation axes (fields 23 to 34). The first two domains include for each FSP the geographic and structural position, the SS name, the hosting fault-system name and average dip-direction, the geometric parameters (strike, dip-direction and dip, and trend and plunge), the newly calculated rake and corresponding kinematic classifications, the references of the field data and two quality rankings on the input data resolutions and location. The third domain, entirely new from this work, includes for each FSP, the attitude ( trend and plunge) of the kinematic axes (P, B, T) measured at 45° and 30° from striation in the extensional movement plane (see the main paper for more details). This database represents the most complete local-scale collection of Quaternary geological fault/slip data and derived kinematic and strain parameters over a large regional seismogenic and potentially seismogenic territory. The QUIN database is meant as a relatively aseptic data input for forecoming stress inversion and geodynamic modelling, fundamental for new generations of seismotectonics and seismic hazard assessment research