Measuring magnitude and rate of vertical movements in the offshoreCapo Vaticano (W Calabria) using lowstand coastal prisms and wavebuiltterraces

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The magnitude and rate of vertical movements have beenmeasured in the offshore Capo Vaticano (western Calabria) forthe Late Pleistocene - Holocene on the basis of the depth ofsubmerged coastal prism and associated wave-built terraceformed during the sea-level lowstand of the Last GlacialMaximum (LGM). Uplifted and submerged terraces haveproved to be valuable recorders of vertical motion in manylocations around the world (e.g. DICKINSON, 2001; WEBSTER etalii, 2004) as the depth of their tops appear to be controlled bythe sea-level. In the eastern Tyrrhenian margins, depending onthe hydraulic energy conditions (i.e. waves and wind-inducedcurrents), the average water depth of terraced surface oflowstand coastal prisms was probably 15-20 m (CHIOCCI &ORLANDO, 1996).A series of LGM lowstand coastal prisms and associatedwave-built terraces were identified on a new set of very highresolutionreflection seismic profiles acquired along thecontinental shelf and upper slope of the western Calabriacontinental margin. Data processing included time-depthconversion and the interpretation of the resulting seismic lineswas performed using a GIS-based software package.Seismic interpretation highlight that along the offshoreCapo Vaticano the slope-breaks associated with wave-builtterraced formed during the LGM deepens from ~130 m (clusterA) to ~170 m (cluster B) below sea level (bsl) as one movesfrom southwest to the northeast, over a distance of ~21 km(Fig. 1). Farther to the north, along the western flank of theCalabrian Arc, an average depth for the slope-breaks of ~165 mis measured. Removal of the non tectonic component of vertical changesusing an ice-volume equivalent eustatic sea-level compilation(LAMBECK et alii, 2011) indicates ~15 (± 5) m of uplift and~25 (± 5) m of subsidence during the post-LGM for thesouthern and northern sectors offshore Capo Vaticano,respectively. The resulting average uplift and subsidence rates(both regional and local components) for the last 20 (± 2) k.y.are 0.75 (±0.325) mm/y and 1.25 (±0.375) mm/y, respectively. The integration of the new data with those available in theliterature (e.g. TORTORICI et alii, 2003; CUCCI & TERTULLIANI,2010; FERRANTI et alii, 2011) may provide information onfault kinematics and constraints on slip rates of tectonicstructures that are relevant for earthquake hazard analysis ofwestern Calabrian margin.REFERENCESCHIOCCI, F. L. & ORLANDO L. (1996) - Lowstand terraces onTyrrhenian Sea steep continental scope. Marine Geology,134, 127-143.CUCCI, L. & TERTULLIANI A. (2010) - The Capo Vaticano(Calabria) coastal terraces and the 1905 M7 earthquake:the geomorphological signature of regional uplift andcoseismic slip in southern Italy. Terra Nova, 22, 378–389.doi: 10.1111/j.1365-3121.2010.00961.xDICKINSON, W.R. (2001)- Paleoshoreline record of relativeHolocene sea levels on Pacific islands. Earth-ScienceReviews, 55, p. 191–234. doi: 10.1016/S0012-8252(01)00063-0.FERRANTI L., SCICCHITANO G., SPAMPINATO C. R., ANTONIOLIF., MONACO C. (2011) - Holocene coastal uplift at CapoVaticano, Calabria: implications for differentialdeformation rates. Riassunti VIII Forum FIST Geoitalia2011, 19-23 Settembre 2011, Torino. Epitome, 4, 153.LAMBECK, K., F. ANTONIOLI, M. ANZIDEI, L. FERRANTI, G.LEONI, G. SCICCHITANO & S. SILENZI (2011) - Sea levelchange along the Italian coast during the Holocene andprojections for the future. Quaternary International, 232,250-257.WEBSTER, J.M., WALLACE, L., SILVER, E., APPLEGATE, B.,POTTS, D., BRAGA, J.C., RIKER-COLEMAN, K. & GALLUP, C.(2004) - Drowned carbonate platforms in the Huon Gulf,
Lingua originaleEnglish
Numero di pagine0
Stato di pubblicazionePublished - 2012

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