Výsledky vyhledávání - "Yoshifumi Kawada"

Akademický článek

Hydrogeological structure of a seafloor hydrothermal system deduced from a pair of positive and negative self-potential anomalies observed at the Oomuro-dashi hydrothermal field in the Izu-Ogasawara Arc, south of Japan

Autor: Yoshifumi Kawada, Takafumi Kasaya

Publikováno v: Earth, Planets and Space, Vol 76, Iss 1, Pp 1-23 (2024)

Abstract This paper presents and interprets two new self-potential data measured over a hydrothermally active field associated with a Quaternary rhyolitic volcano, Oomuro-dashi, in the northern Izu-Ogasawara Arc, south of Japan. The measured data sho

Externí odkaz: https://doaj.org/article/ab1d29b1be0244919fda8bedaf340675

Zobrazit plný text záznamu

Akademický článek

Electrochemical survey of electroactive microbial populations in deep-sea hydrothermal fields

Autor: Masahiro Yamamoto, Yoshifumi Kawada, Yoshihiro Takaki, Kosuke Shimoniida, Mariko Shitara, Akiko Tanizaki, Hiroyuki Kashima, Miho Hirai, Yutaro Takaya, Tatsuo Nozaki, Takafumi Kasaya, Ken Takai

Publikováno v: Progress in Earth and Planetary Science, Vol 11, Iss 1, Pp 1-15 (2024)

Abstract Electric discharge in deep-sea hydrothermal fields leads us to expect the existence of electroactive microbial ecosystems in the environments. Electrochemical properties such as electric field distribution on the seafloor and electrical cond

Externí odkaz: https://doaj.org/article/b20292c63a154e72b62b54f70537f930

Zobrazit plný text záznamu

Akademický článek

Marine DC resistivity and self-potential survey in the hydrothermal deposit areas using multiple AUVs and ASV

Autor: Takafumi Kasaya, Hisanori Iwamoto, Yoshifumi Kawada, Tadahiro Hyakudome

Publikováno v: Terrestrial, Atmospheric and Oceanic Sciences, Vol 31, Iss 5, Pp 579-588 (2020)

Detecting resistivity and self-potential (SP) anomalies is useful for the exploration of hydrothermal deposits. Using autonomous underwater vehicles (AUVs) can increase survey effectiveness because it allows stable posture control without a towing wi

Externí odkaz: https://doaj.org/article/6fc7f79be475494b83166bde627c11d0

Zobrazit plný text záznamu

Akademický článek

Deep-Sea DC Resistivity and Self-Potential Monitoring System for Environmental Evaluation With Hydrothermal Deposit Mining

Autor: Takafumi Kasaya, Hisanori Iwamoto, Yoshifumi Kawada

Publikováno v: Frontiers in Earth Science, Vol 9 (2021)

Environmental impact assessment has become an important issue for deep-sea resource mining. The International Seabed Authority has recently developed recommendations for guidelines on environmental assessment of resource mining effects. Several resea

Externí odkaz: https://doaj.org/article/a2e61309804942338f1fc19ac065600d

Zobrazit plný text záznamu

Akademický článek

Self-potential mapping using an autonomous underwater vehicle for the Sunrise deposit, Izu-Ogasawara arc, southern Japan

Autor: Yoshifumi Kawada, Takafumi Kasaya

Publikováno v: Earth, Planets and Space, Vol 70, Iss 1, Pp 1-15 (2018)

Abstract We performed a simultaneous survey of self-potential and plume turbidity using an autonomous underwater vehicle (AUV) above the Sunrise deposit in the Myojin Knoll caldera of the Izu-Ogasawara arc. A 10-m-long electrode rod, on which five el

Externí odkaz: https://doaj.org/article/e8d6b60225124156b1258e1c3ccc28ba

Zobrazit plný text záznamu