1,721,002 research outputs found
A nonplanar slow rupture episode during the 2000 Miyakejima dike intrusion
Full text linkMagmatic intrusions release extensional strain in the Earth's crust upon availability of magma. Intrusions are typically accompanied by earthquake swarms and by surface faulting that is often larger than what is expected from the magnitude of the induced earthquakes. The 2000 Miyakejima dike intrusion triggered the largest volcanic earthquake swarm monitored so far, with five Ml>6 earthquakes. We analyze the seismicity and deformation induced by the Miyakejima dike with the aim of constraining the timescale and mechanisms of slow strain release during the episode. In six earthquake bursts lasting few hours and migrating at ∼1 km h−1 we find candidates for slow earthquakes. Each burst nucleated at the tips of previous bursts, suggesting stress interaction. The variability of fault plane solutions indicates that the bursts occurred on a complex system of fractures, consistent with weakly consolidated surface layers strained by spatially inhomogneous stresses that change in time, such as those induced by a dike. Based on dislocation models, we find that deformation is best explained by aseismic slip (in addition to the seismic burst), with a moment 1.3 to 2.3 times larger than the earthquakes' seismic moment, and opening of 0.20 ± 0.07 m on the dike. The aseismic slip occurred over a few hours, with moment, duration, and migration velocity consistent with that of previously observed slow slip events. We argue that the seismic bursts are likely driven by slow slip, sharing most properties with tectonic slow slip events and swarms, but occurring on a set of nonaligned faults
Stress changes, focal mechanisms, and earthquake scaling laws for the 2000 dike at Miyakejima (Japan)
Full text linkFaulting processes in volcanic areas result from a complex interaction of pressurized fluid‐filled cracks and conduits with the host rock and local and regional tectonic setting. Often, volcanic seismicity is difficult to decipher in terms of the physical processes involved, and there is a need for models relating the mechanics of volcanic sources to observations. Here we use focal mechanism data of the energetic swarm induced by the 2000 dike intrusion at Miyakejima (Izu Archipelago, Japan), to study the relation between the 3‐D dike‐induced stresses and the characteristics of the seismicity. We perform a clustering analysis on the focal mechanism (FM) solutions and relate them to the dike stress field and to the scaling relationships of the earthquakes. We find that the strike and rake angles of the FMs are strongly correlated and cluster on bands in a strike‐rake plot. We suggest that this is consistent with optimally oriented faults according to the expected pattern of Coulomb stress changes. We calculate the frequency‐size distribution of the clustered sets finding that focal mechanisms with a large strike‐slip component are consistent with the Gutenberg‐Richter relation with a b value of about 1. Conversely, events with large normal faulting components deviate from the Gutenberg‐Richter distribution with a marked roll‐off on its right‐hand tail, suggesting a lack of large‐magnitude events (Mw > 5.5). This may result from the interplay of the limited thickness and lower rock strength of the layer of rock above the dike, where normal faulting is expected, and lower stress levels linked to the faulting style and low confining pressure
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
Influences of Semaphorin 3A Expression on Clinicopathological Features, Human Papillomavirus Status, and Prognosis in Oropharyngeal Carcinoma
No full text博士論文 要旨Abstract/本文Full 以下に掲載：MICROOGARNISM 8 2020. MPDI. 共著者：Hai Thanh Pham , Satoru Kondo *, Kazuhira Endo, Naohiro Wakisaka, Yoshitaka Aoki, Yosuke Nakanishi, Kina Kase, Harue Mizokami, Makoto Kano, Takayoshi Ueno, Miyako Hatano, Makiko Moriyama-Kita, Hisashi Sugimoto, Tomokazu Yoshizak
Influences of Semaphorin 3A Expression on Clinicopathological Features, Human Papillomavirus Status, and Prognosis in Oropharyngeal Carcinoma
Full text link金沢大学博士（医学）博士論文 要旨Abstract/本文Full 以下に掲載：MICROOGARNISM 8 2020. MPDI. 共著者：Hai Thanh Pham , Satoru Kondo *, Kazuhira Endo, Naohiro Wakisaka, Yoshitaka Aoki, Yosuke Nakanishi, Kina Kase, Harue Mizokami, Makoto Kano, Takayoshi Ueno, Miyako Hatano, Makiko Moriyama-Kita, Hisashi Sugimoto, Tomokazu Yoshizakidoctoral thesi
GNSS observations of transient deformation in plate boundary zones
No full textGNSS geodetic techniques have revealed that crustal deformation in tectonic plate boundary zones does not occur at a steady rate in the time between earthquakes. Instead, crustal deformation is characterized by a diverse array of processes occurring throughout the earthquake cycle, spanning multiple spatiotemporal scales. These include episodic slow slip events on faults that can last weeks to years, which have spurred on a new field of inquiry into fault slip behavior and earthquake generation. GNSS geodetic observations following large earthquakes have illuminated a range of postseismic deformation processes operating at a range of depths, in response to stress changes imposed by large earthquakes. Widespread observations of transient deformation processes at plate boundaries have illuminated how plate motion is accommodated along plate boundaries, and have helped to reveal the rheology of the crust and mantle and the physical processes behind fault slip and earthquake occurrence
1-9 Ground deformation of Suwanose-jima volcano inferred from InSAR
No full text平成24年度京都大学防災研究所一般研究集会(24K-05)「SAR研究の新時代に向けて」, 京都大学防災研究所連携研究棟大セミナー室, 2012/9/12-1
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
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