Zobrazeno 1 - 10
of 147
pro vyhledávání: '"Hisashi Utada"'
Publikováno v:
Earth, Planets and Space, Vol 76, Iss 1, Pp 1-20 (2024)
Abstract We consider a general case of a magnetotelluric (MT) study to reveal three-dimensional (3D) distribution of the electrical conductivity within the Earth based on measurements of electromagnetic (EM) fields by a two-dimensional (2D) array. Su
Externí odkaz:
https://doaj.org/article/edcbb20ab0ee4fffaec2a79d6401667e
Autor:
Hyunsun Kang, YoungHee Kim, Shu‐Huei Hung, Pei‐Ying Patty Lin, Takehi Isse, Hitoshi Kawakatsu, Sang‐Mook Lee, Hisashi Utada, Nozomu Takeuchi, Hajime Shiobara, Hiroko Sugioka, Seung‐Sep Kim
Publikováno v:
Geochemistry, Geophysics, Geosystems, Vol 24, Iss 9, Pp n/a-n/a (2023)
Abstract The oldest oceanic basin (160–180 Ma) in the western Pacific is the birthplace of the Pacific Plate and is thus essential for understanding the formation and evolution of the oceanic plate. However, the upper mantle structure beneath the r
Externí odkaz:
https://doaj.org/article/132a6736f6434ec2827bc0428ba38d38
Publikováno v:
Earth, Planets and Space, Vol 70, Iss 1, Pp 1-10 (2018)
Abstract During the last magmatic eruption period of Aso volcano (November 2014 to May 2015), a controlled-source electromagnetic volcano monitoring experiment (ACTIVE) was conducted. Here, we interpret the temporal variations in the electromagnetic
Externí odkaz:
https://doaj.org/article/8272a4677a5b4321881e2511e047f05e
Publikováno v:
Earth, Planets and Space, Vol 69, Iss 1, Pp 1-18 (2017)
Abstract Regularization is used to solve the ill-posed problem of magnetotelluric inversion usually by adding a stabilizing functional to the objective functional that allows us to obtain a stable solution. Among a number of possible stabilizing func
Externí odkaz:
https://doaj.org/article/696c7b8ff3cd4a7c9afff034b2e0fab6
Autor:
Kiyoshi Baba, Noriko Tada, Tetsuo Matsuno, Pengfei Liang, Ruibai Li, Luolei Zhang, Hisayoshi Shimizu, Natsue Abe, Naoto Hirano, Masahiro Ichiki, Hisashi Utada
Publikováno v:
Earth, Planets and Space, Vol 69, Iss 1, Pp 1-23 (2017)
Abstract Seafloor magnetotelluric (MT) experiments were recently conducted in two areas of the northwestern Pacific to investigate the nature of the old oceanic upper mantle. The areas are far from any tectonic activity, and “normal” mantle struc
Externí odkaz:
https://doaj.org/article/a96711f4f4794fbc8a5e3caa9d5706ca
Autor:
Haruka Nagai, Nozomu Takeuchi, Hitoshi Kawakatsu, Hajime Shiobara, Takehi Isse, Hiroko Sugioka, Aki Ito, Hisashi Utada
Publikováno v:
Geophysical Journal International. 233:1974-1986
SUMMARYInversion for seismological structures of the oceanic lithosphere–asthenosphere system is important to understand the mechanisms of plate tectonics. Previous models of the oceanic upper mantle have been primarily obtained via global tomograp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::caad93c23efae1beb1c8985e6817769e
https://doi.org/10.1093/gji/ggad049
https://doi.org/10.1093/gji/ggad049
Autor:
Ji-hoon Park, Sung-joon Chang, Michael Witek, Sang-Mook Lee, YoungHee Kim, Hisashi Utada, Hajime Shiobara, Takehi Isse, Nozomu Takeuchi, Hiroko Sugioka
In the Western Pacific, there are unique geologic/tectonic features such as oldest oceanic crust in the Pacific, seamount chains derived from the Caroline hotspot, the Ontong-Java plateau which is the largest large igneous province, and complex plate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aa147c7a079802a9e00bb0752db6e37b
https://doi.org/10.5194/egusphere-egu23-11314
https://doi.org/10.5194/egusphere-egu23-11314
Autor:
Tae-shin Kim, Ji-hoon Park, Ji-won Ko, Se-young Oh, Michael Witek, Sung-Joon Chang, Sang-Mook Lee, YoungHee Kim, Hisashi Utada, Hitoshi Kawakatsu, Hajime Shiobara, Takehi Isse, Nozomu Takeuchi, Hiroko Sugioka
Publikováno v:
Bulletin of the Seismological Society of America.
We characterize the sources of background noise recorded by an ocean-bottom seismometer array deployed on the oldest oceanic lithosphere of the western Pacific plate. This igneous oceanic crust is blanketed up to 1000 m cover of sediments, making it
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4ee78fe0ee5bdefbd85f037ab20e7579
https://doi.org/10.1785/0120220215
https://doi.org/10.1785/0120220215
Autor:
Yuki Kawano, Takehi Isse, Hitoshi Kawakatsu, Hajime Shiobara, Nozomu Takeuchi, Hiroko Sugioka, YoungHee Kim, Hisashi Utada, Sang-Mook Lee
Publikováno v:
Bulletin of the Seismological Society of America.
We modified existing methods of noise reduction to data recorded by Japanese broadband ocean-bottom seismometers (BBOBSs) deployed on the western Pacific seafloor conducted as the Oldest-1 Array observation. We removed the tilt and compliance noise t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::36e2c1e6b66bcbbcbe1da4c85440ac8d
https://doi.org/10.1785/0120220256
https://doi.org/10.1785/0120220256
Publikováno v:
Geophysical Journal International. 222:1502-1525
SUMMARY Electrical anisotropy in the oceanic upper mantle can only be imaged by seafloor magnetotelluric (MT) data, and arguably provides important clues regarding the mantle structure and dynamics by observational determinations. Here, we attempt to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7634febc7ffc4fbeced3e26690b247f8
https://doi.org/10.1093/gji/ggaa221
https://doi.org/10.1093/gji/ggaa221