NOAFAULTS KMZ layer Version 4.0

The NOAFAULTs database of active faults of Greece was first published in 2013 (versions 1.0 &amp; 1.1; http://dx.doi.org/10.12681/bgsg.11079). The version 2.1 was published in 2018 http://doi.org/10.5281/zenodo.3483136). Version 3.0 was published in 2020 http://doi.org/10.5281/zenodo.4304613 NOAFAULTs was created towards compiling a digital database of fault geometry and additional attributes (kinematics, slip rate, associated seismicity etc.) primarily to support seismicity monitoring at the National Observatory of Athens (NOA). It has been constructed from published fault maps in peer-reviewed journals since <strong>1972</strong> while the number of the scientific papers that have contributed with fault data in version 4.0 is <strong>127</strong>. The standard commercial software ARCGIS has been used to design and populate the database. The fault layer was produced by on-screen digitization of fault traces at the original map-scale and is available through our web portal application https://arcg.is/04Haer supported by ESRI. In this version, a number of <strong>2751</strong> active faults are included. 93% of the active faults are normal faults, 4% are strike-slip faults and only 3% represent the reverse faults. Also, reliable data on slip rates are available for <strong>106</strong> faults. Data on instrumental and historical seismicity are linked to <strong>171</strong> and <strong>130</strong> active faults, respectively. In addition, a) surface-rupturing geological data and b) data on the proximity of epicentres of strong seismic events to the traces of active faults allows the identification of <strong>101</strong> rupturing faults (<em>seismic faults</em>) that included in this version of the database. The NOAFAULTs database shows that nearly 52% of its active faults imply high seismic risk level in the broader area of Greece. These active faults can generate surface faulting or strong ground motions that can cause serious damage to buildings and infrastructures and therefore represent a significant hazard, particularly in the densely populated and industrialized areas of Greece.