1,721,027 research outputs found
SEISMIC ACTIVITY IN THE VICINITY OF THE ATOTSUGAWA FAULT, CENTRAL JAPAN
No full textSeismic activity near the Atotsugawa fault, one of the most prominent active faults in central Japan is studied from the data during 1977-1993 recorded by a local seismological observation network. Epicenter distribution, as a whole, clearly concentrates along the Atotsugawa fault, but in detail, seismicity is high in the southwestern half of the fault and at the northeastern end of the fault. There is a low seismicity area in the immediately northeastern part from the middle of the fault, where the Geographical Survey Institute found creep movement of the fault. Cutoff depth of seismicity is 14-16 km, which is rather deeper than those in the Hida Mountain range. This suggests that the cutoff depth is closely related to the thermal structure of the crust. Seismic activity seems to be stationary during the observation period, except for a middle-sized earthquake swarm occurred in December, 1986 with a 2-3 month precursory low seismicity period in the southwest of the middle part of the fault and an earthquake of M 4.4, which was the largest event during the observation period, at the southwestern end of the fault. Focal mechanisms of the major earthquakes along the fault show strike-slip type with a slight reverse fault component, which well coincides with the fault movements.Seismic activity near the Atotsugawa fault, one of the most prominent active faults in central Japan is studied from the data during 1977-1993 recorded by a local seismological observation network. Epicenter distribution, as a whole, clearly concentrates along the Atotsugawa fault, but in detail, seismicity is high in the southwestern half of the fault and at the northeastern end of the fault. There is a low seismicity area in the immediately northeastern part from the middle of the fault, where the Geographical Survey Institute found creep movement of the fault. Cutoff depth of seismicity is 14-16 km, which is rather deeper than those in the Hida Mountain range. This suggests that the cutoff depth is closely related to the thermal structure of the crust. Seismic activity seems to be stationary during the observation period, except for a middle-sized earthquake swarm occurred in December, 1986 with a 2-3 month precursory low seismicity period in the southwest of the middle part of the fault and an earthquake of M 4.4, which was the largest event during the observation period, at the southwestern end of the fault. Focal mechanisms of the major earthquakes along the fault show strike-slip type with a slight reverse fault component, which well coincides with the fault movements
SEISMIC ACTIVITY IN THE NORTHWESTERN CHUBU DISTRICT
No full textSeismic activity in the northwestern Chubu region has been investigated mainly frommicroearthquake observations near the Atotsugawa fault, one of first class active geologicalfaults in Japan, and its environment, together with epicentral distribution of major historicalearthquakes and moderate-size earthquakes determined by the JMA. Six majar past earthquakesin this region might be associated with fault movement of the Atotsugawa fault.Seismicity of microearthquakes near the fault has been routinely monitored since 1971. Theresults obtained to date show: 1) a clear lineation of microearthquakes along the Atotsugawafault, with an intermittent zone of low seismicity, 2) less clear lineation but considerablyhigh activity near a latent smaller fault along the Yamada river, 3) high activity withclustered epicenters just south of Mt. Norikura, and 4) extremely low seismicity over aregion southeast of the Atotsugawa fault.The above pattern of seismicity does not greatly vary with time except in the region 2).Focal depths of these microearthquakes along the Atotsugawa fault are mainly confined toshallower than 15-20 kin, which appears to suggest the lower boundary of the fault plane, orpossible change of crustal properties there.Composite distribution of first motion of P wave from a number of earthquakes appears toindicate that maximum compressional, tectonic stresses lie in a derection slightly deviatingfrom the E-W direction.Seismic activity in the northwestern Chubu region has been investigated mainly frommicroearthquake observations near the Atotsugawa fault, one of first class active geologicalfaults in Japan, and its environment, together with epicentral distribution of major historicalearthquakes and moderate-size earthquakes determined by the JMA. Six majar past earthquakesin this region might be associated with fault movement of the Atotsugawa fault.Seismicity of microearthquakes near the fault has been routinely monitored since 1971. Theresults obtained to date show: 1) a clear lineation of microearthquakes along the Atotsugawafault, with an intermittent zone of low seismicity, 2) less clear lineation but considerablyhigh activity near a latent smaller fault along the Yamada river, 3) high activity withclustered epicenters just south of Mt. Norikura, and 4) extremely low seismicity over aregion southeast of the Atotsugawa fault.The above pattern of seismicity does not greatly vary with time except in the region 2).Focal depths of these microearthquakes along the Atotsugawa fault are mainly confined toshallower than 15-20 kin, which appears to suggest the lower boundary of the fault plane, orpossible change of crustal properties there.Composite distribution of first motion of P wave from a number of earthquakes appears toindicate that maximum compressional, tectonic stresses lie in a derection slightly deviatingfrom the E-W direction
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
SEISMIC ACTIVITY IN THE HIDA MOUNTAIN RANGE: THE 1993 EARTHQUAKE SWARM NEAR MT. YARIGATAKE
No full textSeismic activity in the Hida Mountain range has been high since the swarm activity in January, 1990. A middle-sized earthquake of magnitude 5.0 occurred in July, 1993 near Mt. Yarigatake and the event has been the largest one in the Hida mountain range since the Kamitakara Observatory started monitoring of seismicity in 1976. In this paper migration, precise distribution of hypocenters and focal mechanisms of major events near Mt. Yarigatake are studied together with the seismicity in the entire region of the Hida Mountain range. Eight major swarm activities occurred during 11 month, and hypocenters of the swarms migrated in the north-south direction. Focal depths are relocated by two methods to derive their precise distribution. Resultant depths are less than 8 km and decrease from north towards Yakedake Volcano, beneath which focal depths are as shallow as less than 3 km. For more large scale, earthquake swarms migrate from north to south and south to north along the Hida Range. Mechanisms were determined from P-wave first motions. Events in the northern part of the Hida Range have strike-slip or normal fault with NNE-SSW tension axes, on the contrary those in the southern half of it have strike-slip or reverse fault type with ESE-WNW presure axes. This complicated stress field suggests that the thermal activity in the mountains superposed on the global stress field due to plate movements.Seismic activity in the Hida Mountain range has been high since the swarm activity in January, 1990. A middle-sized earthquake of magnitude 5.0 occurred in July, 1993 near Mt. Yarigatake and the event has been the largest one in the Hida mountain range since the Kamitakara Observatory started monitoring of seismicity in 1976. In this paper migration, precise distribution of hypocenters and focal mechanisms of major events near Mt. Yarigatake are studied together with the seismicity in the entire region of the Hida Mountain range. Eight major swarm activities occurred during 11 month, and hypocenters of the swarms migrated in the north-south direction. Focal depths are relocated by two methods to derive their precise distribution. Resultant depths are less than 8 km and decrease from north towards Yakedake Volcano, beneath which focal depths are as shallow as less than 3 km. For more large scale, earthquake swarms migrate from north to south and south to north along the Hida Range. Mechanisms were determined from P-wave first motions. Events in the northern part of the Hida Range have strike-slip or normal fault with NNE-SSW tension axes, on the contrary those in the southern half of it have strike-slip or reverse fault type with ESE-WNW presure axes. This complicated stress field suggests that the thermal activity in the mountains superposed on the global stress field due to plate movements
Deep Seismic Activity around Yake-dake Volcano, Central Japan.
No full text北アルプス脊梁部に位置する焼岳火山周辺では，1998年8月に発生した活発な浅部の群発地震活動の後，深部地震活動が観測されている。1999年6月には，深部低周波地震の群発活動が発生した。その後，孤立型の深部低周波地震が散発していたが，2002年1月頃から，高周波成分に富む，微動的な波形を呈する深部地震が観測されるようになっている。これらの深部地震活動は，焼岳火山の深部マグマ活動が活発化した指標の可能性もあり，今後の地震活動を注視する必要があると考えられる。Deep seismic activities possibly triggered by an intense shallow swarm activity have been observedaround Yake-dake volcano, central Japan. On August 1998, an intense shallow swarm activity tookplace along the major axis of the Hida mountain range near the Yake-dake volcano. On June 1999, aswarm activity of deep low-frequency earthquakes was observed beneath the Yake-dake volcano at thedepths of 25 km - 35 km. DLF earthquakes have been observed after the swarm of DLF events with theslight changes of the waveforms. Since January 2002, tremor-like earthquakes, that contains the higherfrequency components, have been observed. They were located at the intermediate depth between shallowand DLF earthquakes. These deep seismic activities are probably related to the magma activity of theYake-dake volcano.北アルプス脊梁部に位置する焼岳火山周辺では，1998年8月に発生した活発な浅部の群発地震活動の後，深部地震活動が観測されている。1999年6月には，深部低周波地震の群発活動が発生した。その後，孤立型の深部低周波地震が散発していたが，2002年1月頃から，高周波成分に富む，微動的な波形を呈する深部地震が観測されるようになっている。これらの深部地震活動は，焼岳火山の深部マグマ活動が活発化した指標の可能性もあり，今後の地震活動を注視する必要があると考えられる。Deep seismic activities possibly triggered by an intense shallow swarm activity have been observedaround Yake-dake volcano, central Japan. On August 1998, an intense shallow swarm activity tookplace along the major axis of the Hida mountain range near the Yake-dake volcano. On June 1999, aswarm activity of deep low-frequency earthquakes was observed beneath the Yake-dake volcano at thedepths of 25 km - 35 km. DLF earthquakes have been observed after the swarm of DLF events with theslight changes of the waveforms. Since January 2002, tremor-like earthquakes, that contains the higherfrequency components, have been observed. They were located at the intermediate depth between shallowand DLF earthquakes. These deep seismic activities are probably related to the magma activity of theYake-dake volcano
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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