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Implementation of a numerical methodology for the stochastic characterization of the Valdivia 1960 9.5 MW tsunami source.
No full textThesis submitted for the degree of Master of Sciences in Geophysics.Probabilistic Tsunami Hazard Assessment (PTHA) brings a variety of mathematical and numerical
tools for evaluating long-term exposure to tsunami related hazards in coastal communities, within
which the logic tree method stands out for its usefulness and versatility in generating random slip
models and dealing with epistemic and aleatory uncertainties, key items for the stochastic study of
future tsunami scenarios. This method, by combining parameters that define a source model (such
as magnitude, and rupture limits), allows for the creation of a vast number of random source models
that can be used for assessing future and long-term hazard. They can also be used in conjunction
with data and observations obtained from past tsunamis and earthquakes to open new possibilities
for studying past tsunami, and their seismic source models.
This study proposes a numerical methodology for the generation of random tsunami source
models, based on the aforementioned logic tree method, for studying past tsunamis and historical
tsunamis. In this case this methodology will be tested with compiled data from the great Valdivia
1960 9.5 Mw earthquake and tsunami. This methodology works by filtering the random source
models produced by using the logic tree methodology in a staggered fashion. Firstly, they are filtered
with empirical relations between magnitudes and rupture dimensions or rupture aspect ratios.
The remaining models are then used to compute vertical seafloor deformation using the Okada
(1985) solution. These deformation fields are then compared with geodetic data and observations
associated with the event of interest, in this case the Valdivia 1960 earthquake, eliminating all
models that do not satisfy these observations. In contrast, all models that do pass this filter, are
used as inputs to model tsunami using a staggered scheme, first modelling with low resolution
topobathymetry grids, in order to assess if tsunami waves are registered in locations that are
known to have been inundated and eliminate the models that do not show this behavior. For
those that fulfil the low-resolution modeling, high resolution grids are used to model tsunami and
appraise the estimated run up of inundations and compare them with reliable historical accounts and
sedimentological observations. The models that pass all filters mentioned above, will be subjected
to statistical analysis, such as conditional probability analysis of slip amounts according to its
location or the analysis of the cumulative density functions of the slip, to compare them with
existent, published, models of the Valdivia 1960 earthquake.
In order to appraise the convergence of the random models generated using a logic tree approach
that pass every filter to the existent source models, the Valdivia 1960 9.5 Mw event will be used
as a benchmark to test this methodology, due to the number of published studies, data available,
reliable historical accounts and source models computed with different techniques and from different
data sets, such as geodetic, seismic or tsunami recordings. It is of the utmost importance to further
specify that this methodology was designed, and is intended to be used, to study historical tsunami,
and will only be tested with modern tsunamis because of the availability of data and studies, such
is the case of the Valdivia 1960 earthquake.
The hypothesis proposed in this study is that the estimation of the most likely tsunami source
(slip distribution and rupture geometry and limits) of the Valdivia 1960, procured through the
analysis of random displacement models obtained using a logic tree structure will be a solution that
satisfy the available geodetic, deformation and tsunami data, observations and historical accounts.
This work is subdivided into two parts, an initial resolution test with synthetic deformation,
wave arrival and inundation data to test the capabilities and the response of the method to different
types of data availability, such as differences in data density (a large number of data points versus
sparse points), distribution (uniform distribution along the territory versus clusters of data or
just one cluster) or differences in availability of deformation or tsunami data. Once this test is
performed, the methodology will be applied to the case of the Valdivia earthquake.Facultad de Ciencias Físicas y MatemáticasConcepció
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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