Search Results 1-20 of 251

  • STUDY ON STRENGTH AND OUT-OF-PLANE BUCKLING OF STEEL HEXAGONALLY LATTICED PLATES SUBJECTED TO CYCLIC SHEAR DEFORMATION  [in Japanese]

    YAMASHITA Tetsuo , OYOBE Hiroyuki , MIYAZAWA Ryosuke

    … In the region at high seismicity as Japan, structural walls are used as earthquake resistant shear walls and subjected to severe cyclic shear deformation during strong earthquakes. … Crack was also observed in the H2 and H4 tests. … All these breaks and cracks occurred on the vertical members.<br> The hysteresis curves were not slip but spindle shape even in the H3 test where severe buckling was observed. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (753), 1647-1654, 2018-11

    J-STAGE  AIJ 

  • Resistivity characterisation of Hakone volcano, Central Japan, by three-dimensional magnetotelluric inversion

    Yoshimura Ryokei , Ogawa Yasuo , Yukutake Yohei , Kanda Wataru , Komori Shogo , Hase Hideaki , Goto Tada-nori , Honda Ryou , Harada Masatake , Yamazaki Tomoya , Kamo Masato , Kawasaki Shingo , Higa Tetsuya , Suzuki Takeshi , Yasuda Yojiro , Tani Masanori , Usui Yoshiya

    … Intense earthquake swarm activity and geodetic signals corresponding to the 2015 eruption were also observed within the Hakone caldera. … The main features of the best-fit three-dimensional model are a bell-shaped conductor, the bottom of which shows good agreement with the upper limit of seismicity, beneath the central cones and the Owakudani geothermal area, and several buried bowl-shaped conductive zones beneath the Gora and Kojiri areas. …

    Earth, Planets and Space (70), 2018-04-26

    IR 

  • Seismic activity associated with the 2014 Shiraoi earthquake (MJMA 5.6) in middle east Iburi region, Hokkaido  [in Japanese]

    一柳 昌義 , シェスタコフ ニコライ , 奥山 哲 , 大園 真子 , 笠原 稔 , 高橋 浩晃

    … Maximum seismic intensity of 5- was observed at Shiraoi town. … Aftershocks occurred in surrounding part of a low seismicity patch. … These facts suggested that mainshock rupture propagated from deep to shallow, and a low seismicity patch was mainshock slip area. …

    北海道大学地球物理学研究報告 (81), 17-26, 2018-03-19

    IR  DOI 

  • Detection of Small Earthquakes Using the Matched Filter Method Immediately After the Tohoku-Oki Earthquake:—Application to the Off-Kamaishi Repeating Earthquakes Cluster—  [in Japanese]

    OKUDA Takashi , UCHIDA Naoki , ASANO Youichi

    … The seismicity in the Kamaishi area becomes active in the later part of their M∼5 earthquake cycles. … For the post Tohoku-oki smaller events down to M2, almost all earthquakes occurred in the latter part of the two Off-Kamaishi mainshock earthquake cycles, which is a similar pattern observed before the Tohoku-oki earthquake. …

    Zisin (Journal of the Seismological Society of Japan. 2nd ser.) 71(0), 87-101, 2018

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  • Detection of Small Earthquakes Using the Matched Filter Method Immediately After the Tohoku-Oki Earthquake:—Application to the Off-Kamaishi Repeating Earthquakes Cluster—  [in Japanese]

    OKUDA Takashi , UCHIDA Naoki , ASANO Youichi

    … The seismicity in the Kamaishi area becomes active in the later part of their M∼5 earthquake cycles. … For the post Tohoku-oki smaller events down to M2, almost all earthquakes occurred in the latter part of the two Off-Kamaishi mainshock earthquake cycles, which is a similar pattern observed before the Tohoku-oki earthquake. …

    Zisin (Journal of the Seismological Society of Japan. 2nd ser.) 71(0), 87-101, 2018

    J-STAGE 

  • A long source area of the 1906 Colombia-Ecuador earthquake estimated from observed tsunami waveforms

    Yamanaka Yusuke , Tanioka Yuichiro , Shiina Takahiro

    … The tsunami propagated across the Pacific Ocean, and its waveforms were observed at tide gauge stations in countries including Panama, Japan, and the USA. … A digital dataset of observed tsunami waveforms at the Naos Island (Panama) and Honolulu (USA) tide gauge stations, where the tsunami was clearly observed, was first produced by consulting documents. …

    Earth planets and space (69), 163, 2017-12-06

    IR 

  • Seismogenesis of dual subduction beneath Kanto, central Japan controlled by fluid release

    Ji Yingfeng , Yoshioka Shoichi , Manea Vlad C. , Manea Marina

    … Because of the complex interaction between the two subducted plates, the origin of seismicity in such region is still not fully understood. … Using high-resolution three-dimensional thermo-mechanical models tailored for the specific dual subduction settings beneath Kanto, we show that, compared with single-plate subduction systems, subduction of double slabs produces a strong variation of mantle flow, thermal and fluid release pattern that strongly controls the regional seismicity distribution. …

    Scientific Reports (7), 16864, 2017-12-04

    IR 

  • Earthquake Clusters in the Japanese Islands:——Detection and Spatial-Temporal Characteristics——  [in Japanese]

    IGARASHI Toshihiro

    … However, earthquake clusters that occur in isolation from surrounding earthquakes are rarely observed. …

    Zisin (Journal of the Seismological Society of Japan. 2nd ser.) 70(0), 183-194, 2017

    J-STAGE 

  • Numerical analysis of seismic behaviour of soil under frozen surface conditions

    Siva Subramanian Srikrishnan , Ishikawa Tatsuya , Tokoro Tetsuya , Kusunoki Fumiya

    … An earthquake during the freezing period and thawing period may cause severe disasters i.e. slope failures induced by the combined effects of seismicity and snow melt water. … Different liquefaction behaviour is observed when considering surface frozen conditions under both loose and high relative densities of soil. …

    Japanese Geotechnical Society Special Publication 5(2), 135-140, 2017

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  • Diagnosis of Conduit State of Sakurajima Volcano Using Continuous Records on Gravity and Crustal Movements  [in Japanese]

    大久保 修平 , 山本 圭吾 , 井口 正人

    … In particular, significant seismicity (>800 volcano-tectonic earthquakes in 15 hours) and crustal deformations (>10 cm displacement) were observed on Aug. 15, 2015, followed by an unusually long quiescent period since October 2015. …

    東京大学地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo 92(2-4), 91-99, 2017

    IR 

  • Seismicity of recent years after 2001 in Shimane Prefecture and its implication to the local geomorphology and geology  [in Japanese]

    林 広樹

    … This study demonstrates the detailed correlation of recent seismicity (2001-2010) with geomorphological analyses, surface geology and gravity anomaly in Shimane Prefecture, southwestern Honshu, Japan. … With the conjugate sense of the seismic zone, relatively small zone of NNW-SSE trending are observed from Mt. Sambe to Miyoshi City, Hiroshima Prefecture (Sambe-Miyoshi Seismic Zone: SMSZ).The YISZ can be correlated with the geomorphological boundary between the Tsunozu and Kibi Low-relief Surfaces in the Iwami Highland. …

    島根大学地球資源環境学研究報告 = Geocience reports of Shimane University (35), 17-24, 2016-12

    IR 

  • Remote triggering of seismicity at Japanese volcanoes following the 2016 M7.3 Kumamoto earthquake

    Enescu Bogdan , Shimojo Kengo , Opris Anca , Yagi Yuji

    … Such relatively widespread remote seismicity activation, following a large inland earthquake, has not been reported before for Japan. … The relatively large-amplitude Love waves, enhanced by a source directivity effect during the Kumamoto earthquake, may have triggered seismicity on local active faults. … The dynamic stresses in the areas where remote activation has been observed range from several kPa to tens of kPa, the thresholds being lower than in previous dynamic triggering cases for Japan; …

    Earth, Planets and Space (68), 2016-10-20

    IR 

  • Remote triggering of seismicity at Japanese volcanoes following the 2016 M7.3 Kumamoto earthquake

    Enescu Bogdan , Shimojo Kengo , Opris Anca , Yagi Yuji , 八木 勇治

    … Such relatively widespread remote seismicity activation, following a large inland earthquake, has not been reported before for Japan. … The relatively large-amplitude Love waves, enhanced by a source directivity effect during the Kumamoto earthquake, may have triggered seismicity on local active faults. … The dynamic stresses in the areas where remote activation has been observed range from several kPa to tens of kPa, the thresholds being lower than in previous dynamic triggering cases for Japan; …

    Earth, planets and space 68(1), 165, 2016-10

    IR 

  • Effect of Atmospheric-related Noise Reduction Using Numerical Weather Model for InSAR Analysis:― Application to the 2015 Sakurajima Dike Intrusion Event ―  [in Japanese]

    Kobayashi Tomokazu

    … Two clear phase changes are observed in the Minami-dake summit area and the Nabeyama area in the In-SAR image acquired just after the event. … With the data applying the noise reduction, a nearly vertical dike opening is inferred as the optimal source model, which is consistent with the source geometry deduced from GNSS data or seismicity. …

    Journal of the Geodetic Society of Japan 62(2), 79-88, 2016

    J-STAGE 

  • The 2016 Kumamoto earthquake sequence

    KATO Aitaro , NAKAMURA Kouji , HIYAMA Yohei

    … The intense seismicity released the accumulated elastic energy by right-lateral strike slip, mainly along two known, active faults. … The faulting style is reasonably consistent with regional deformation observed on geologic timescales and with the stress field estimated from seismic observations. … Following the mainshock rupture, postseismic deformation has been observed, as well as expansion of the seismicity front toward the southwest and northwest.</p> …

    Proceedings of the Japan Academy, Series B 92(8), 358-371, 2016

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  • Spatial Variation of Ground Motion of Niigata-ken Chuetsu Area during the 2011 off the Pacific Coast of Tohoku Earthquake:- Analysis of the Data from Dense Observation Array -  [in Japanese]

    UETAKE Tomiichi , HIKIMA Kazuhito , SEKINE Shutaro , SAWADA Yoshihiro

    新潟県中越地域に展開された観測点間隔5 km~10 kmの高密度地震観測網により観測された東北地方太平洋沖地震の記録の分析を行った。加速度波形は、太平洋側の宮城県・福島県とは異なり特徴的なパルスを持つ波群はなく、丘陵部で10~20 cm/s<sup>2</sup>、平野部で30~40 cm/s<sup>2</sup>である。加速度フーリエスペクトルは …

    Journal of Japan Association for Earthquake Engineering 16(4), 4_66-4_79, 2016

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  • Increment of seismicity of the building area depending on soil conditions

    Rasulov Khayat , Rasulov Rustam

    … This report is devoted to one of topical questions of a seismic building - to specification of seismicity of a territory depending on concrete soil conditions of the building area. … It in great degrees concerns a choice of the reference soil corresponding to seismicity of territory on a card of seismic zoning. …

    Japanese Geotechnical Society Special Publication 2(19), 729-732, 2016

    J-STAGE 

  • Hydrogeological responses to incoming materials at the erosional subduction margin, offshore Osa Peninsula, Costa Rica

    Kameda Jun , Harris Robert N. , Shimizu Mayuko , Ujiie Kohtaro , Tsutsumi Akito , Ikehara Minoru , Uno Masaoki , Yamaguchi Asuka , Hamada Yohei , Namiki Yuka , Kimura Gaku

    … This region is landward of the observed updip extent of seismicity. … We posit that in this region the presence of subducting bathymetric relief capped by velocity weakening nannofossil chalk is more important in influencing the updip extent of seismicity than the thermal regime. …

    Geochemistry geophysics geosystems 16(8), 2725-2742, 2015-09

    IR 

  • Precursory tilt changes of small phreatic eruptions of Meakan-dake volcano, Hokkaido, Japan, in November 2008

    Aoyama Hiroshi , Oshima Hiromitsu

    … In this study, we observed seismic activities before and during the 2008 phreatic eruption at Meakan-dake volcano, eastern Hokkaido, Japan, by using broadband seismometers and surface mount-type tiltmeters. … The precursory increase in seismicity began in late September about 2 months before the first eruption on November 18. … After several rises and falls in seismicity in October and in early November, a small volcanic tremor was observed early on November 16. …

    Earth planets and space (67), 119, 2015-07-29

    IR 

  • Disaster Research of Kuchinoerabujima Eruptions in 2014-2015  [in Japanese]

    為栗 健 , 井口 正人 , 中道 治久 , 山本 圭吾

    … Precursory phenomena of the 2015 eruption, such as inflation of ground deformation and increase of SO2 flux from November in 2014, appearance of volcanic glow at the Shindake crater from March in 2015 and higher seismicity of volcanic earthquakes including a felt earthquake from the middle of May in 2015 are observed. …

    京都大学防災研究所年報 (59), 85-90, 2015

    IR 

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