Slip distributions on active normal faults measured from LiDAR and ﬁeld mapping of geomorphic offsets: an example from L'Aquila, Italy and implications for modelling seismic moment release

dc.contributor.author	Wilkinson, Maxwell	en
dc.contributor.author	Roberts, Gerald P.	el
dc.contributor.author	McCaffrey, Ken	en
dc.contributor.author	Cowie, Patience A.	en
dc.contributor.author	Faure Walker, Joanna P.	en
dc.contributor.author	Papanikolaou, Ioannis D.	en
dc.contributor.author	Watson, Zoë K.	en
dc.contributor.author	Wedmore, Luke	en
dc.contributor.author	Vittori, Eutizio	en
dc.contributor.author	Michetti, Alessandro Maria	en
dc.contributor.author	Phillips, Richard J.	el
dc.contributor.other	Παπανικολάου, Ιωάννης Δ.	el
dc.date.accessioned	2015-10-23T10:44:14Z
dc.date.available	2015-10-23T10:44:14Z
dc.date.issued	2015-10-23
dc.identifier.uri	http://62.217.125.90/xmlui/handle/123456789/6416
dc.rights	Αναφορά Δημιουργού 3.0 Ηνωμένες Πολιτείες	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/us/	*
dc.subject	Earthquakes	en
dc.subject	Slip distribution	en
dc.subject	Fault scarps	en
dc.subject	Last glacial maximum	en
dc.subject	LiDAR	en
dc.title	Slip distributions on active normal faults measured from LiDAR and ﬁeld mapping of geomorphic offsets: an example from L'Aquila, Italy and implications for modelling seismic moment release	en
heal.type	journalArticle
heal.generalDescription	Πρόκειται για άρθρο Ανοιχτής Πρόσβασης (Open Access)	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.geomorph.2014.04.026
heal.language	en
heal.access	free
heal.recordProvider	University of London/Department of Earth and Planetary Sciences	en
heal.recordProvider	Durham University/Department of Earth Sciences	en
heal.recordProvider	University of Bergen/Department of Earth Science	en
heal.recordProvider	University of London/Institute of Risk and Disaster Reduction	en
heal.recordProvider	Γεωπονικό Πανεπιστήμιο Αθηνών/Τμήμα Αξιοποίησης Φυσικών Πόρων και Γεωργικής Μηχανικής	el
heal.recordProvider	University of Leeds/School of Earth and Environment	en
heal.recordProvider	Dipartimento di Scienza e Alta Tecnologia	it
heal.recordProvider	Servizio Geologico d’Italia, ISPRA	it
heal.publicationDate	2015
heal.bibliographicCitation	Maxwell Wilkinson et al. Slip distributions on active normal faults measured from LiDAR and ﬁeld mapping of geomorphic offsets: an example from L'Aquila, Italy, and implications for modelling seismic moment release, "Geomorphology" vol. 237, pp. 130-141, Elsevier 2015	en
heal.abstract	Surface slip distributions for an active normal fault in central Italy have been measured using terrestrial laser scanning (TLS), in order to assess the impact of changes in fault orientation and kinematics when modelling subsurface slip distributions that control seismic moment release. The σoutheastern segment of the surface trace of the Campo Felice active normal fault near the city of L'Aquila was mapped and surveyed using techniques fromstructural geology and using TLS to deﬁne the vertical and horizontal offsets of geomorphic slopes since the last glacial maximum (15 ± 3 ka). The fault geometry and kinematics measured from 43 sites and throw/heave measurements from geomorphic offsets seen on 250 scarp proﬁles were analysed using a modiﬁcation of the Kostrov equations to calculate the magnitudes and directions of horizontal principal strain-rates. The map trace of the studied fault is linear, except where a prominent bend has formed to link across a former left-stepping relay-zone. The dip of the fault and slip direction are constant across the bend. Throw-rates since 15 ± 3 ka decrease linearly from the fault centre to the tip, except in the location of the prominent bend where higher throw rates are recorded. Vertical coseismic offsets for two palaeo earthquake ruptures seen as fresh strips of rock at the base of the bedrock scarp also increase within the prominent bend. The principal strain-rate, calculated by combining strike, dip, slip-direction and post 15 ± 3 ka throw rate, decreases linearly from the fault centre towards the tip; the strain-rate does not increase across the prominent fault bend. The above shows that changes in fault strike, whilst having no effect on the principal horizontal strain-rate, can produce local maxima in throw-rates during single earthquakes that persist over the timescale of multiple earthquakes (15 ± 3 ka). Detailed geomorphological and structural characterisation of active faults is therefore a critical requirement in order to properly deﬁne fault activity for the purpose of accurate seismic hazard assessment. We discuss the implications of modelling subsurface slip distributions for earthquake ruptures through inversion of GPS, InSAR and strong motion data using planar fault approximations, referring to recent examples on the nearby Paganica fault that ruptured in the Mw 6.3 2009 L'Aquila Earthquake.	en
heal.publisher	Elsevier	en
heal.journalName	Geomorphology	en
heal.journalType	peer-reviewed
heal.fullTextAvailability	true