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Late Quaternary fault movements in the Mt. Baldo-Lessini Mts sector of the Southalpine area (northern Italy)

Published online by Cambridge University Press:  01 April 2016

Fabrizio Galadini ,
Paolo Galli ,
Augusto Cittadini  and
Biagio Giaccio
Fabrizio Galadini*
Affiliation:
CNR, Istituto di Ricerca sulla Tettonica Recente, Area di Ricerca di Roma-Tor Vergata, via del Fosso del Cavaliere, 1-00133, Roma, Italy
Paolo Galli
Affiliation:
Servizio Sismico Nazionale, via Curtatone 3, 1-00185, Roma, Italy (e-mail: [email protected])
Augusto Cittadini
Affiliation:
CNR, Istituto di Ricerca sulla Tettonica Recente, Area di Ricerca di Roma-Tor Vergata, via del Fosso del Cavaliere, 1-00133, Roma, Italy
Biagio Giaccio
Affiliation:
CNR, Istituto di Ricerca sulla Tettonica Recente, Area di Ricerca di Roma-Tor Vergata, via del Fosso del Cavaliere, 1-00133, Roma, Italy
*
corresponding author e-mail: [email protected]

Abstract

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Paleoseismological investigations have been performed at Mt. Baldo and in the Lessini Mts. in order to collect quantitative data on the activity of minor faults showing geomorphic evidence of recent activation. The 4.5-km-long, NNE-SSW trending Naole fault was responsible for the formation of a narrow depression at the top of Mt. Baldo, bordered by a continuous bedrock (carbonate) fault scarp to the west. The extensional activity along this minor fault is probably due to gravitational deformations (lateral spreading) in response to the warping of the Mt. Baldo anticline. A 1.5-km-long graben is instead related to the 2.5-km-long, NNW-SSE trending Orsara fault (Lessini Mts.) which was responsible for the formation of bedrock (carbonate) fault scarps. This minor fault is part of a complex structural framework made of few-km-long faults which show evidence of Quaternary activity. Two trenches have been excavated across the Naole fault which showed the occurrence of displacement events subsequent to 17435-16385 BP (cal. age) and probably prior to 5455-5385/5330-5295 BP (cal. age). Two other trenches have been excavated across the Orsara fault whose analysis indicated that the most recent displacement event occurred between 20630-19795 BP and 765-675 BP (cal. age). The upper chronological limits of the displacements give some indications about the minimum elapsed time since the last fault activation (about 5,300 years for the Naole fault and 5-8 centuries for the Orsara fault). Both 1) the maximum expected magnitude of the earthquakes which may originate along the Mt. Baldo thrust and 2) the identification of a main fault responsible for the displacements along the complex net of minor faults affecting the Lessini Mts. are still open questions. As for point 1 although historical earthquakes with magnitude 4.5-5 may be associated with the Mt. Baldo thrust, the investigations carried out in this area did not clarify whether larger magnitude earthquakes may be expected. As for point 2, the cause of the displacements along the Orsara (Lessini Mts.) fault may be related to the activity of a major blind fault (which, however, has never been identified), responsible for the uplift of the Lessini Mts. More generally, the obtained results demonstrate the limits of traditional paleoseismological analyses in Alpine areas whose erosional/depositional activity has been strongly conditioned by the Late Pleistocene glacial history. The lack of units younger than loess and colluvial sediments related to the Last Glacial Maximum makes it impossible to define narrower chronological constraints for the displacements and to estimate the number and size of the displacement events. Moreover, the rebound following the retreat of the thick glacial cover affecting the Alpine area may have induced stresses responsible for higher deformation rates after the Last Glacial Maximum. Higher surficial deformation rates could imply shorter recurrence intervals for faulting episodes and/or larger magnitude earthquakes. Therefore, paleoseismologically inferred data in Alpine areas may not correctly define the fault behaviour related to the present tectonic regime.

Keywords

active tectonicspaleoseismologyactive faultnorthern Italy
Type
Research Article
Information
Netherlands Journal of Geosciences , Volume 80 , Issue 3-4 , December 2001 , pp. 187 - 208
Copyright
Copyright © Stichting Netherlands Journal of Geosciences 2001

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