[S-IT24] Probing the Earth's interior with geophysical observation on seafloor

Tue. May 22, 2018 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Daisuke Suetsugu(Department of Deep Earth Structure and Dynamics Research, Japan Agency for Marine-Earth Science and Technology), Guilhem BARRUOL(CNRS, Institut de Physique du Globe de Paris, France), Hitoshi Kawakatsu(東京大学地震研究所, 共同), Douglas Wiens(Washington University in St Louis)

Most important sites for plate tectonics and mantle dynamics studies (e.g., subduction zones, spreading ridges, and hot spots) are located in oceanic regions. The coverage of seismic stations is concentrated in land areas, which cover only one-third of Earth's surface. Since 1990s, technology for seafloor geophysical instruments to explore deep earth structure have been advanced, such as broadband ocean bottom seismographs (BBOBSs), ocean bottom electro-magnetometers (OBEMs), and pressure gauge, because observation network in oceanic regions is essential for major breakthroughs in Earth sciences. Technical advance in the instruments including cabled realtime seafloor networks have made the seafloor observation more common and reliable, which promotes a number of seafloor observations, both temporary and permanent networks, in the last decade. We call for papers on recent scientific results from such observation projects, including those on crust and mantle structure beneath subduction zones, hot spots, Large Igneous Provinces, and spreading ridges. Technical advances for observation in oceanic regions, including seafloor instruments and drifting float, proposals and plans for innovative observations are also welcome.

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[SIT24-P01] The OJP array: seismological and electromagnetic observation on seafloor and islands in the Ontong Java Plateau

*Daisuke Suetsugu¹, Hajime Shiobara², Hiroko Sugioka⁴, Noriko Tada¹, Aki Ito¹, Takehi Isse², Kiyoshi Baba², Hiroshi Ichihara³, Toyonobu Ota⁵, Yasushi Ishihara¹, Satoru Tanaka¹, Masayuki Obayashi¹, Takashi Tonegawa¹, Junko Yoshimitsu¹, Takumi Kobayashi⁴, Hisashi Utada² (1.Department of Deep Earth Structure and Dynamics Research, Japan Agency for Marine-Earth Science and Technology, 2.Earthquake Research Institute, the University of Tokyo, 3.Earthquake and Volcano Research Center Graduate School of Environmental Studies, Nagoya University, 4.Graduate School of Science, Kobe University, 5.Tierra Tecnica, Ltd.)

[SIT24-P02] The initial report of the electromagnetic observation on the seafloor in the Ontong Java Plateau

*Noriko Tada¹, Kiyoshi Baba², Hiroshi Ichihara³, Toyonobu Ota⁴, Takumi Kobayashi⁵, Hisashi Utada², Daisuke Suetsugu¹ (1.Department of Deep Earth Structure and Dynamics Research, Japan Agency for Marine-Earth Science and Technology, 2.Earthquake Research Institute, The University of Tokyo, 3.Graduate School of Environmental Studies, Nagoya University, 4.TIERRA TECNICA Ltd., 5.Graduate School of Science, Kobe University)

[SIT24-P03] Shear wave splitting observed in the Ontong Java Plateau and adjacent regions

*Satoru Tanaka¹, Daisuke Suetsugu¹, Hajime Shiobara², Hiroko Sugioka³, Aki Ito¹, Takehi Isse², Yasushi Ishihara⁴, Masayuki Obayashi¹, Takashi Tonegawa⁴, Junko Yoshimitsu¹, Takumi Kobayashi³ (1.Department of Deep Earth Structure and Dynamics Research, Japan Agency for Marine-Earth Science and Technology, 2.Earthquake Research Institute, University of Tokyo, 3.Department of Planetology, Kobe University, 4.R&D Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology)

[SIT24-P04] Sedimentary structure and tectonic setting of the Lyra basin central-western Pacific Ocean

*Shoka Shimizu¹, Masao Nakanishi¹, Seiichi Miura², Daisuke Suetsugu² (1.Chiba University, 2.Japan Agency for Marine-Earth Science and Technology)

[SIT24-P05] sPL waves observed by the OJP array in the Ontong Java Plateau

*Minoru Kobayashi, Motoo Ukawa¹, Yoshio Fukao², Daisuke Suetsugu², Hajime Shiobara³, Hiroko Sugioka⁴, Aki Ito², Takehi Isse³, Yasushi Ishihara², Satoru Tanaka², Masayuki Obayashi², Takashi Tonegawa², Junko Yoshimitsu², Takumi Kobayashi⁴ (1.Nihon University, 2.Japan Agency for Marine-Earth Science and Technology, 3.Earthquake Research Institute, the University of Tokyo, 4.Kobe University)

[SIT24-P06] OBS Orientation from Ship Noise Polarization

Alister Trabattoni¹, *Guilhem BARRUOL¹, Richard Dreo², Abdel Boudraa², Fabrice R. Fontaine³ (1.Institut de Physique du Globe de Paris, Sorbonne Paris Cité, UMR CNRS 7154, Paris France, 2.IRENav, EA 3634, BCRM Brest, CC 600, 29240 Brest Cedex 9, France, 3.Laboratoire GéoSciences Réunion, Université de La Réunion, IPGP, Saint Denis, France)

[SIT24-P07] Toward complete tomography of the Earth’s interior with floating robotic acoustic sensors in the oceans: the EarthScope-Oceans

*Masayuki Obayashi¹, Hiroko Sugioka², Hajime Shiobara³ (1.D-EARTH, Japan Agency for Marine-Earth Science and Technology, 2.Department of Planetology, Kobe University, 3.Eartquake Research Institute, University of Tokyo)

[SIT24-P08] Seafloor electromagnetic investigations of the upper mantle of the Mariana back-arc spreading and subduction system

*Tetsuo Matsuno^1,2, Nobukazu Seama^2,1 (1.Kobe Ocean Bottom Exploration Center, Kobe University, 2.Department of Planetology, Graduate School of Science, Kobe University)

[SIT24-P09] 3D gravity modeling of crustal structures beneath the Southwest Indian Ridge

*Doo-Hyun Kang¹, Seung-Sep Kim² (1.Dept. of Astronomy, Space Science and Geology, Chungnam National University , 2.Dept. of Geology and Earth Environmental Sciences, Chungnam National University)

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