The Porretta thermal springs (Northern Apennines): seismogenic structures and long-term geochemical monitoring

N. Ciancabilla, M. Ditta, F. Italiano, G. Martinelli


The thermal springs of Porretta are located on a seismically active area of the Northern Apennines. In 19th Century
a chemist identified anomalous behaviour of the thermal waters in concomitance with local seismic events. Recent
studies assessed the geochemical features of the circulating fluids (e.g., waters carry a dissolved CH4-dominated gas
phase with a radiogenic signature of the helium isotopic ratio) and observed anomalous hydrologic and geochemical
signals possibly related to crustal strain phenomena due to local seismic events. Long-term geochemical monitoring
was carried out from 2001 to 2006 with the aim of detecting the behaviour of the circulating fluids possibly
coinciding with seismic activity. The collected data reveal a sensitivity of the thermal waters to the activity of the
main fault crossing the village of Porretta and identify a «seismogenic» structure crossing the village.


Fluids;Tectonic lines;monitoring;geochemistry

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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X