1,721,174 research outputs found
A Natural Laboratory for Offshore Paleotsunami Studies: The Augusta Bay (Eastern Sicily, Italy)
No full textThe recent results obtained from a 6.7 long piston core (MS06), collected 2.3 km
offshore Augusta at a water depth of 72 m and made of an almost homogeneous dark gray mud dated back to the last 4500 yrs, stimulated our curiosity in searching for other similar signatures. In fact, quantitative micropaleontological analysis of benthic foraminifera assemblages highlighted 12 anomalous intervals, marked by peaks with high percentages of displaced epiphytic specimens and an increase in the sandy component. These
anomalies were generally accompanied by a significant amount of Posidonia remnants, a localized concentration of molluscs and organic-rich bands. Thus, the twelve anomalous peaks were interpreted as the primary effect of tsunami waves backwash).
Moreover, five out of the twelve anomalous layers were embedded in age intervals encompassing the dates of major tsunamis that hit eastern Sicily (1908, 1693, and 1169) and the broader Eastern Mediterranean (AD 365 Crete and Santorini at about BP 3600).
Seven additional cores were sampled from the northern part of the Augusta Bay, along a transect 60 to 110 m of water depth, to retrieve the details of the MS06 sequence uppermost part. Four out of the seven new cores were selected and studied. Preliminary dating suggests that the sampled sequence spans ca. 400-500 yrs. Moreover, physical properties, ITRAX Xray
fluorescence (XRF) and grain size analyses point out the presence of a peculiar interval made of Posidonia remnants, coarse sand and shell debris on the two cores closer to the shore. The two faroff
cores seem to be more homogenous but a few thin sandy lenses enriched of Posidonia remnant were also recognized. Further
detailed micropaleontological analysis and corroboration with instrumental data are still in progress and will help in discriminating single events potentially related to tsunami backwash.PublishedSan Francisco (USA)2T. Tettonica attivaope
A Natural Laboratory for Offshore Paleotsunami Studies: The Augusta Bay (Eastern Sicily, Italy)
No full textThe recent results obtained from a 6.7 long piston core (MS06), collected 2.3 km
offshore Augusta at a water depth of 72 m and made of an almost homogeneous dark gray mud dated back to the last 4500 yrs, stimulated our curiosity in searching for other similar signatures. In fact, quantitative micropaleontological analysis of benthic foraminifera assemblages highlighted 12 anomalous intervals, marked by peaks with high percentages of displaced epiphytic specimens and an increase in the sandy component. These
anomalies were generally accompanied by a significant amount of Posidonia remnants, a localized concentration of molluscs and organic-rich bands. Thus, the twelve anomalous peaks were interpreted as the primary effect of tsunami waves backwash).
Moreover, five out of the twelve anomalous layers were embedded in age intervals encompassing the dates of major tsunamis that hit eastern Sicily (1908, 1693, and 1169) and the broader Eastern Mediterranean (AD 365 Crete and Santorini at about BP 3600).
Seven additional cores were sampled from the northern part of the Augusta Bay, along a transect 60 to 110 m of water depth, to retrieve the details of the MS06 sequence uppermost part. Four out of the seven new cores were selected and studied. Preliminary dating suggests that the sampled sequence spans ca. 400-500 yrs. Moreover, physical properties, ITRAX Xray
fluorescence (XRF) and grain size analyses point out the presence of a peculiar interval made of Posidonia remnants, coarse sand and shell debris on the two cores closer to the shore. The two faroff
cores seem to be more homogenous but a few thin sandy lenses enriched of Posidonia remnant were also recognized. Further
detailed micropaleontological analysis and corroboration with instrumental data are still in progress and will help in discriminating single events potentially related to tsunami backwash.PublishedSan Francisco (USA)2T. Tettonica attivaope
Sedimentary and biostratigraphic features of the Plio-Pleistocene successions of the Peloritani Mts (Sciliy, southern Italy).
No full textBiostratigraphic and sedimentary features of the Plio-Pleistocene succession of Rometta (Peloritani Mts., NE Sicily).
No full text
Sedimentation and tectonics in a steep shallow-marine depositional system: stratigraphic arrangement of the Pliocene-Pleistocene Rometta Succession (NE Sicily, Italy)
No full textA 160 m thick Pliocene-Pleistocene sedimentary succession, cropping out in NE Sicily (Rometta Succession), was subdivided into three unconformity-bounded units, overlying deformed bedrock: (i) a Middle Pliocene sandymarly R1 unit; (ii) an Upper Pliocene-Lower Pleistocene biocalcarenitic R2 unit; (iii) a Middle Pleistocene mudstone R3 unit. The R2 unit is composed of at least three sub-units, bounded by truncation surfaces, and showing aggradational patterns of strata. Each of these sub-units records a sudden seaward-shifting of the facies tract. A stratigraphic gap of
~870 kyr at the R1/R2 boundary, marks an abrupt change from offshore transition to shoreface environments. A second gap of ~260 kyr at the R2/R3 boundary corresponds to a sudden deepening of the environments, from shoreface to fully offshore. The Rometta units represent three incomplete, tectonically-enhanced depositional sequences. The R1 unit is a HST of a lower sequence, marked at the top by a slightly angular unconformity. The R2 unit is a HST of a younger depositional sequence, aggrading above a ravinement surface. During these relative sea level still-stands, the local tectonic uplift combined with the high-frequency eustatic oscillations, produced three forward-stepping sets of minor sequences within the R2 HST, simulating the typical FSST stratigraphic arrangement. The top of the R2 is bounded by an erosive surface, representing the transgressive surface of the subsequent R3 depositional sequence. The R3 unit is a late TST+HST of a Pliocene-Pleistocene sequence, the LST of which probably occurs basinward. The foresetted R2 biocalcarenites are unimodal in their paleocurrents. This feature resulted from shore-directed wind stress, applied to the water surface and reflected by a steep paleocoast, generating basinward-directed bottom currents
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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