Database of Italian present-day stress indicators, IPSI 1.4

Abstract

The Italian Present-day Stress Indicators (IPSI) database is a freely available Italian georeferenced repository of information regarding the crustal stress field. It consists of horizontal stress orientations that have been analysed, compiled in a standardised format and quality-ranked for reliability and comparability on a global scale. The database contains a collection of information regarding contemporary stress within the shallow crust from the following main stress-indicator categories: borehole breakouts; earthquake focal mechanisms; seismic sequences and active fault-slip data. The present database (IPSI 1.4) released in January 2020 is accessible through a web interface which facilitates findability, accessibility, interoperability and reusability of the dataset. Moreover, it contains 928 records updated up until December 2019 with an increase of 10% with respect to the first one, and improved metadata information. The uniform spread of stress data over a given territory is relevant for earth crustal modelling or as starting point in many applied studies. It is therefore necessary to continue collecting new data and update present-day stress maps to obtain more reliable evaluations.

A comprehensive database of active and potentially-active continental faults in Chile at 1:25,000 scale

“…Many geothermal fields occur in tectonically-active regions and maps of active faults have been used both for exploration and selection of drilling sites 15,16 as well as for reservoir modelling during exploitation 17,18 . Active fault databases have been also used in studies of volcanotectonic interactions and structural control on volcanism in rifts 19 and arcs 20 , in the interpretation of present-day stress indicators 21,22 as well as to infer sources of pre-instrumental earthquakes 23 and the response of groundwater to near and farfield earthquakes 24 . Analyses of the rupture mechanism, propagation and kinematics of many recent earthquakes and earthquake sequences have relied on databases of active faults derived from geomorphic and geologic data to interpret subsurface observations and develop conceptual models 3,6,25,26 .…”

Earthquake Rupture Forecasts for the MPS19 Seismic Hazard Model of Italy

“…The complex interaction among the three plates is still ongoing, with the Nubia and Eurasian plates that are converging at a rate of about 10 mm/yr along a NNW-SSE direction [DeMets et al, 1990;Serpelloni et al, 2005;Billi et al, 2011;Palano, 2015;Scarfì et al, 2018]. The current seismotectonics of Italy reflects the complex geodynamic regional setting, as documented by presentday stress indicators [e.g., Carafa and Barba, 2013;Mariucci and Montone, 2020] and focal mechanisms [e.g., Pondrelli et al, 2020;Roselli et al, 2018]. As shown in Figure 1, shallow extensional focal mechanisms and normal faulting prevail along the axial portion of the Apennines from northern Italy to the northernmost part of Sicily.…”

An Integrated Multiscale Method for the Characterisation of Active Faults in Offshore Areas. The Case of Sant’Eufemia Gulf (Offshore Calabria, Italy)

“…Active deformation data (GPS, Devoti et al, 2017;focal mechanisms, Totaro et al, 2016, Pondrelli et al, 2020; active stress indicators, IPSI database, Mariucci and Montone, 2020) show that the central sector of the Calabrian Arc is characterised by an NW-SE oriented extensional tectonic regime, responsible for large magnitude earthquakes (e.g., Galli and Peronace, 2015). Towards the east, the Ionian offshore area undergoes a transcurrent regime due to the oblique plate convergence (Totaro et al, 2016), and is affected by active compressional structures related to the Calabrian subduction complex (e.g., Polonia et al, 2011;Gutscher et al, 2017).…”