1,721,075 research outputs found
Comment on “The Curious Case of the 1346 Earthquake Recorded Only by Very Young Chroniclers” by Romano Camassi and Viviana Castelli
No full textThe article by Camassi and Castelli (2013) (hereinafter CC13) deals with the 1346, northern Italy earthquake, one of hundreds of medieval earthquakes that were investigated in Italy from 1983 to 2007. Regrettably, the article does not add any new data but only proposes a revision and a reinterpretation of published materials. CC13 first criticized the variability of magnitude estimates assigned to this earthquake in catalogs published in Italy over the past 20 years, then went so far as to question whether the 1346 earthquake actually occurred. Their analysis, however, is fraught with demonstrable mistakes in the analysis of medieval texts, such that their conclusions are objectionable both from the point of view of historical criticism and from that of historical seismology. Such conclusions may critically affect the assessment of seismic hazard in a heavily populated and industrialized portion of the Po Plain (northern Italy), right at a time when the threat posed by strong earthquakes in this region is being rediscovered by the citizens and by their administrators following the 20 and 29 May 2012, Emilia events (Mw 6.0 and 5.9). As the coauthors of the catalogs being questioned, we feel an obligation to re-establish what is the evidence supporting 1346 being a real major earthquake and why its magnitude is still uncertain
Comment on “High-Definition Mapping of the Gutenberg–Richter b-Value and Its Relevance: A Case Study in Italy” by M. Taroni, J. Zhuang, and W. Marzocchi
Full text linkTaroni et al. (2021) published a statistical framework to reliably estimate the b-value and its uncertainties, with the goal being the interpretation in a seismotectonic context and improving earthquake forecasting capabilities. In this comment, we show that the results presented for the Italian region and the conclusions drawn by the authors, are heavily biased due to quarry-blast events in the Italian earthquake catalog used in the analysis. Without removing this anthropogenic component in the data, a meaningful analysis of the earthquake- size distribution for natural seismicity is, in our opinion, not possible. This comment highlights the need for basic data quality analysis before sophisticated statistical tools are applied to a dataset
Recalibration of the Intensity Prediction Equation in Italy Using the Macroseismic Dataset DBMI15 Version 2.0
Full text linkWe re-compute the coefficients of the intensity prediction equation (IPE) in Italy using the data of the DBMI15 V2.0 intensity database and the instrumental and combined (instrumental plus macroseismic) magnitudes reported by the CPTI15 V2.0 catalog. We follow the same procedure described in a previous article, consisting of a first step in which the attenuation of intensity I with respect to the distance D from macroseismic hypocenter is referred to the expected intensity at the epicenter IE and a second step in which IE is related to the instrumental magnitude Mi, the combined magnitude Mc, the epicentral intensity I0 and the maximum intensity Imax, using error-in-variable (EIV) regression methods.
The main methodological difference with respect to the original article concerns the estimation of the uncertainty of IE to be used for EIV regressions, which is empirically derived from the standard deviation of regression between IE and Mi and also used for the regressions of IE with Mc, I0 and Imax.
In summary, the new IPE determined from DBMI15 V2.0 is
I=I_E-0.0081(D-h)-1.072[ln(D)-ln(h)]
where D=√(R^2+h^2 ), h=4.49 km and IE can be calculated from the intensity data distribution of the earthquake. If the intensity data distribution is not available, IE can be calculated from the following relationships
I_E=-2.578+1.867M_w
I_E=I_
Reply to “Comment on ‘Unbiased Estimation of Moment Magnitude from Body‐ and Surface‐Wave Magnitudes’ by R. Das, H. R. Wason, and M. L. Sharma and ‘Comparative Analysis of Regression Methods Used for Seismic Magnitudes Conversions’ by P. Gasperini, B. Lolli, and S. Castellaro” by J. Pujol
No full textWe suspect that most criticisms by Pujol (2017,
hereafter, P17) were originated by a misunderstanding of our
article (Gasperini et al., 2015) that the author himself frankly
admits (“Some of the arguments made in the paper were not
completely clear to the present author” p. 11) and maybe
even by a misunderstanding of the textbook of Fuller
(1987). In the following, we will discuss in general the main
P17 criticisms, whereas detailed answers to all of them are
reported in the Appendix.Published548–5514IT. Banche datiJCR Journa
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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