We provide a database of the coseismic surface ruptures produced by the 21 August 2017 Md 4.0 earthquake that struck the Casamicciola Terme village in the north of Ischia volcanic island (Italy). Despite its small size, the earthquake caused two fatalities and heavy damages in a restricted area of a few square kilometers. The shallow hypocentral depth of the earthquake caused a significant coseismic surface faulting, testified by a main alignment of ruptures mapped for a 2 km end-to-end length along the Casamicciola E-W trending normal fault system, bounding the northern slope of Mt. Epomeo.Casamicciola Terme has been recurrently destroyed in the last centuries by similar volcano-tectonic earthquakes (1762, 1767, 1796, 1828, 1881, and 1883). After the catastrophic 1883 Casamicciola event (2343 casualties), this is the first heavy damaging earthquake at Ischia that provides, for the first time, the opportunity of integrating historical seismicity, macroseismic observations, instrumental information, and detailed mapping of coseismic geological effects.We performed a detailed field surveys in the epicentral region of the 21 August earthquake to describe the ruptures geometry and kinematics of the seismogenetic fault responsible of the earthquake with the aim of contributing to the seismic hazard evaluation and land use planning in the Ischia island, one of the most crowded touristic destinations worldwide.Summarizing our study of ground effects for the 21 August 2017 earthquake is important for improving knowledge on surface earthquake in the volcanic area and contributing to complete the gap of empirical scaling relating to the surface-faulting mechanism due to small-size or moderate earthquakes in volcano-tectonic framework. The collected field observations result in a dataset of 88 georeferenced records describing coseismic ruptures/fractures by features as ID number, time of sample collection, location (latitude, longitude, elevation), type of rupture, type of affected substratum, attitude (dip angle, dip direction, strike), surface offset (opening, throw, strike slip, net slip), kinematics, slip vector attitude, width of the deformation zone. ALESSIO Giuliana [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] https://orcid.org/0000-0002-0760-4785#297 ALESSIO Giuliana [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] PANGAEA - Data Publisher for Earth & Environmental Science N/A 2020-01-01T00:00:00 https://orcid.org/0000-0003-3205-3070#309 GAUDIOSI Germana [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] GAUDIOSI Germana [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] NAVE Rosella [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] NAVE Rosella [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] https://orcid.org/0000-0002-4091-9404#258 BELVISO Pasquale [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] BELVISO Pasquale [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] https://hdl.handle.net/2122/29889#300 NAPPI Rosa [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] NAPPI Rosa [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] https://orcid.org/0000-0002-1552-4398#347 10.1594/PANGAEA.911773 Istituto Nazionale di Geofisica e Vulcanologia ingv CIVICO Riccardo [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] https://orcid.org/0000-0002-5015-2155#961 CIVICO Riccardo [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] EMERGEO Working Group [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] # EMERGEO Working Group [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] PORFIDO Sabina [Consiglio Nazionale delle Ricerche (CNR), Italy] PORFIDO Sabina [Consiglio Nazionale delle Ricerche (CNR), Italy] https://orcid.org/0000-0002-8383-2034#1858 PELUSO Rosario [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] PELUSO Rosario [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] https://orcid.org/0000-0001-6276-5832#277 SINISCALCHI Valeria [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] https://orcid.org/0000-0003-1564-7627#338 SINISCALCHI Valeria [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] 2024-01-18T00:00:00 terremoti Science and technology Ciencia y tecnología Wissenschaft und Technologie Scienza e tecnologia Science et technologie ingv_962 INGV INGV PANGAEA - Data Publisher for Earth & Environmental Science ingv http://www.ingv.it/it/ https://orcid.org/0000-0003-1495-8175#1113 PIZZIMENTI Luca [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] PIZZIMENTI Luca [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] Coseismic evidence of surface faulting at the Ischia Volcanic Island after the 21 August 2017 Md 4.0 Casamicciola Earthquake vulcani MAROTTA Enrica [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] MAROTTA Enrica [Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy] https://orcid.org/0000-0001-7211-2173#276 {"type": "MultiPolygon","coordinates": [[[ [13.8851,40.748], [13.9063,40.748], [13.9063,40.7391], [13.8851,40.7391], [13.8851,40.748] ]]]} MULTIPOLYGON (((13.8851 40.7480, 13.9063 40.7480, 13.9063 40.7391, 13.8851 40.7391, 13.8851 40.7480)))