Age of submarine debris avalanches and tephrostratigraphy offshore Ischia Island, Tyrrhenian Sea, Italy

Alteriis, Giovanni de; Insinga, Donatella; Morabito, Simona; Morra, Vincenzo; Chiocci, Francesco Latino; Terrasi, F.; Lubritto, Carmine; Benedetto, Claudia Di; Pazzanese, M.

doi:10.1016/j.margeo.2010.08.004

Cited by 61 publications

(37 citation statements)

References 43 publications

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“…The occurrence of parallel lamination at the base of the deposit suggest possible syn-eruptive reworking as already described for this marker tephra in the Naples Bay (Sacchi et al, 2005;Milia et al, 2008). The minor trachytic population of cryptotephra PB2 may also indicate reworking and partial amalgamation with coeval products of Ischia island activity such as the Cretaio event (~60 A.D.; Orsi et al, 1992), found elsewhere off the Campania margin (de Alteriis et al, 2010).…”

Section: Correlation Of Tephra Layers With Source Eventssupporting

confidence: 60%

The Neapolitan Yellow Tuff caldera offshore the Campi Flegrei: Stratal architecture and kinematic reconstruction during the last 15ky

et al. 2014

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In this study we integrate high-resolution swath bathymetry, single channel reflection seismic data and gravity core data, to provide new insights into the shallow structure and latest Quaternary to Holocene evolution of the submerged sector of the Neapolitan Yellow Tuff (NYT) caldera (Campi Flegrei) in the Pozzuoli Bay. The new data allow for a reconstruction of the offshore geometry of the NYT caldera collapse-ring fault system, along with the style and timing of deformation of the inner caldera resurgence. Our interpretation shows that the NYT eruption (~15 ka BP) was associated with a caldera collapse bounded by an inward-dipping ring fault system. The ring fault system consists in a 1-2 km wide fault zone that encircles an inner caldera region~5 km in diameter and is often marked by the occurrence of pore fluids ascending through the fault zone, up to the seafloor, particularly in the western sector of the bay. A shallow magmatic intrusion along the ring fault zone was also detected offshore Bagnoli in the eastern part of the Pozzuoli Bay. Following the NYT eruption, the inner caldera region underwent significant deformation and resurgence with a maximum cumulative uplift of the offshore structure in the order of 180 m. The net uplift rate of the caldera resurgent dome was~9-12 mm/year during the period 15.0-6.6 ka BP. The style of deformation of the resurgent structure can be described in terms of a broad doming, accompanied by subordinate brittle deformation, mostly concentrated in a small apical graben at the summit of the resurgent dome. Chronostratigraphic calibration of seismic profiles obtained by three tephra layers cored in the Pozzuoli Bay indicates 5 to 25 m of post-Roman differential subsidence and tilting towards ESE of the inner caldera resurgence, as recorded by the drowning of the infralittoral prograding wedge below the present-day storm wave base.

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Section: Correlation Of Tephra Layers With Source Eventssupporting

confidence: 60%

The Neapolitan Yellow Tuff caldera offshore the Campi Flegrei: Stratal architecture and kinematic reconstruction during the last 15ky

et al. 2014

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“…9), has been interpreted as the Highstand System Tract of the Late Quaternary depositional sequence. Its attribution, carried out based on seismo-stratigraphic data, showing the occurrence of parallel and continuous seismic reflectors is supported by the stratigraphic framework for the last 23-ky marine record of the Ischia offshore based on AMC 14 C dating and tephrostratigraphic analysis of gravity cores (de Alteriis et al 2010). Two collapse events have been recovered in the marine record, i.e.…”

Section: Geoseismic Interpretation Of the Seismic Profile Sister4_2mentioning

confidence: 59%

“…Three ash layers recognized in the post DA/DF1 marine sequence have been correlated to Ischian eruptions occurred between Middle Ages and Roman times; two tephras recovered in the pre-DF1 succession have been correlated with the explosive activity occurred on Ischia and Procida islands from 23 to 17.5 ky B.P. (de Alteriis et al 2010). This chronostratigraphic reconstruction improved the knowledge of eruptive and collapse events affecting the Ischia offshore during Late Pleistocene-Holocene and their dispersal at sea.…”

Section: Geoseismic Interpretation Of the Seismic Profile Sister4_2mentioning

confidence: 95%

New insights on morpho-structures and seismic stratigraphy along the Campania continental margin (Southern Italy) based on deep multichannel seismic profiles

Aiello

Marsella

Cicchella

et al. 2011

Rend. Fis. Acc. Lincei

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“…A power law is calculated for the SM F s similarly to the SSSs case by considering known submarine mass failures in the Tyrrhenian Sea ( [13,[74][75][76]). The corresponding b-value (= 1.3114) is computed in order to weight the mass failure classes.…”

Section: P Sm Fmentioning

confidence: 99%

A Methodology for a Comprehensive Probabilistic Tsunami Hazard Assessment: Multiple Sources and Short-Term Interactions

Grezio

Tonini

Sandri

et al. 2015

JMSE

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Abstract:We propose a methodological approach for a comprehensive and total probabilistic tsunami hazard assessment (T otP T HA), in which many different possible source types concur to the definition of the total tsunami hazard at given target sites. In a multi-hazard and multi-risk perspective, the approach allows us to consider all possible tsunamigenic sources (seismic events, slides, volcanic eruptions, asteroids, etc.). In this respect, we also formally introduce and discuss the treatment of interaction/cascade effects in the T otP T HA analysis and we demonstrate how the triggering events may induce significant temporary variations in short-term analysis of the tsunami hazard. In two target sites (the city of N aples and the island of Ischia in Italy) we prove the feasibility of the T otP T HA methodology in the multi−source case considering near submarine seismic sources and submarine mass failures in the study area. The T otP T HA indicated that the tsunami hazard increases significantly by considering both the potential submarine mass failures and the submarine seismic events. Finally, the importance of the source interactions J. Mar. Sci. Eng. 2015, 3 24 is evaluated by applying a triggering seismic event that causes relevant changes in the short-term T otP T HA.

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Age of submarine debris avalanches and tephrostratigraphy offshore Ischia Island, Tyrrhenian Sea, Italy

Cited by 61 publications

References 43 publications

The Neapolitan Yellow Tuff caldera offshore the Campi Flegrei: Stratal architecture and kinematic reconstruction during the last 15ky

The Neapolitan Yellow Tuff caldera offshore the Campi Flegrei: Stratal architecture and kinematic reconstruction during the last 15ky

New insights on morpho-structures and seismic stratigraphy along the Campania continental margin (Southern Italy) based on deep multichannel seismic profiles

A Methodology for a Comprehensive Probabilistic Tsunami Hazard Assessment: Multiple Sources and Short-Term Interactions

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