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

Risultato della ricerca: Other

Abstract

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

Fingerprint Entra nei temi di ricerca di 'Measuring magnitude and rate of vertical movements in the offshoreCapo Vaticano (W Calabria) using lowstand coastal prisms and wavebuiltterraces'. Insieme formano una fingerprint unica.

Cita questo