1,720,972 research outputs found
Evidence For Paleoliquefaction In Pleistocene glaciolacustrine deposits in the Albese con Cassano area (Southern Alps, Northern Italy), and possible paleoseismic implications.
Full text linkThe 5th March, 1987 Ecuador earthquake: a review to the macroseismic intensity applying the INQUA Scale.
No full textSynsedimentary deformation of Pleistocene glaciolacustrine deposits in the Albese con Cassano Area (Southern Alps, Northern Italy), and possible implications for paleoseismicity.
No full textWe describe and interpret the well exposed soft-sediment deformations preserved in a Mid-Pleistocene proglacial sequence
outcropping at Albese con Cassano, near Como (Southern Alps, N Italy). The observed deformations affect six distinct
stratigraphic intervals within the same depositional sequence. The stratigraphy of this sequence, the geomorphic setting, and the
careful geological mapping of the area clearly show that these deformations are not the result of glaciotectonics or cryoturbation,
but are due to six separate events of synsedimentary liquefaction. In particular, the 3 basal deformed units include sand and gravel
volcanoes that formed at the bottom of a proglacial lake. We examined several hypothesis of possible causative mechanism for
the formation of these features. Taking into account all the information available on the local geology and sedimentary
environment, it is possible to assess that the liquefaction features at Albese con Cassano had a coseismic origin.
To our knowledge, this would be the first report of similar evidence of paleoseismicity in the Lombardia Southern Alps. Also,
there is no record of historical liquefaction triggered by seismic events in an area of ca. 70 km of radius near Albese con Cassano,
including the town of Como, the large metropolitan area of Milano and most of W Lombardia, that is one of the largest industrial
districts in Europe. Therefore, the interpretation of the observed deformations can have critical impact for understanding the current
seismicity level in the region, and mitigating the associated risk. In this paper we show that this interpretation is not a simple process.
Liquefaction features must be treated with caution in order to derive suitable information for seismic hazard characterization, even if
their coseismic origin has been definitely proved. It is necessary to understand the amount of seismic shaking (for instance, in terms
of local macroseismic intensity) that can have produced that specific feature at that specific site, the location of the causative seismic
event (epicenter and focal depth), and eventually its size (in terms of epicentral intensity and/or earthquake magnitude).
In the case of Albese con Cassano, the implications in terms of seismic hazard of the observed possible earthquake
paleoliquefactions can only be assessed through the definition of several scenarios, taking into account: a) different thresholds of
shaking for triggering the described synsedimentary structures, and b) different seismotectonic frameworks related to the Mid-
Pleistocene to Holocene evolution of the S Alps, including seismicity induced by isostatic glacial rebound. We conclude that it is
worth checking these scenarios in the field with further paleoseismological research on other possible evidence of past
earthquakes
Estratigrafia y deformationes synsedimentarias en sedimentos glaciolacustres del Pleistoceno medio, area de Alebese con Cassano (Alpes Meridionales, Norte de Italia) y posible evidencia de paleosismicidad
No full textActive tectonics of the Insubria region (Central Southern Alps, Italy): the case of the Faloppia Valley at the Lombardia – Ticino border.
No full text
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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