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  1. 防災科研関係論文

Development of an underwater gravity measurement system using autonomous underwater vehicle for exploration of seafloor deposits

https://nied-repo.bosai.go.jp/records/2956
https://nied-repo.bosai.go.jp/records/2956
074ef0a9-6210-4fdd-a1e2-43613332d80a
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Development of an underwater gravity measurement system using autonomous underwater vehicle for exploration of seafloor deposits
著者 Masanao Shinohara

× Masanao Shinohara

en Masanao Shinohara

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Tomoaki Yamada

× Tomoaki Yamada

en Tomoaki Yamada

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Takemi Ishihara

× Takemi Ishihara

en Takemi Ishihara

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Akito Araya

× Akito Araya

en Akito Araya

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Toshihiko Kanazawa

× Toshihiko Kanazawa

en Toshihiko Kanazawa

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Hiromi Fujimoto

× Hiromi Fujimoto

en Hiromi Fujimoto

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Kenji Uehira

× Kenji Uehira

en Kenji Uehira

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Satoshi Tsukioka

× Satoshi Tsukioka

en Satoshi Tsukioka

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Shinobu Omika

× Shinobu Omika

en Shinobu Omika

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Kokichi Iizasa

× Kokichi Iizasa

en Kokichi Iizasa

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抄録
内容記述タイプ Other
内容記述 It is known that there are mineral deposits below seafloor. Gravity survey is one of powerful methods for exploration of underground deposits. A new system is needed to survey a wide area quickly with a higher resolution. Recent technology of an autonomous underwater vehicle (AUV) enables us to measure gravity in underwater environment. We have developed an underwater gravity measurement system for exploration below a seafloor using an AUV. Our system consists of an underwater gravimeter and an underwater gravity gradiometer. The resolution of approximately 0.1 mgal for gravity and 10 Eotvos for gradient is required for the seafloor exploration. For the gravimeter system, we adopted an improved sea/air gravimeter and the sensor is mounted on a gimbal mechanism to keep vertical. A pressure capsule for the gravimeter has a diameter of 50 cm. The gradiometer has two gravimeters aligned vertical at a distance of 44 cm. We developed a gravimeter itself for the gradiometer. Both gravimeters are contained in a vacuum capsule and a gimbal system is also used to keep them vertical. For practical observation in the sea, we choose a large AUV Urashima. All the power is supplied from the Urashima and acoustic communication system on the Urashima enable real-time monitoring during observation. The first observation was carried out in September 2012 in Sagami-Bay, Japan. The Urashima was navigated at a constant speed and constant depth on the same profile. We succeeded in obtaining gravity data and it is found that our system has an accuracy or repeatability of 0.1 mgal for the gravity measurement. In August 2014, we carried out the second gravity survey using our underwater gravity measurement system in Izena caldera, the middle Okinawa Trough, where seafloor deposits were found. We obtained the data from both gravimeter and gradiometer with good quality for all the profiles.
言語 en
書誌情報 en : MTS/IEEE OCEANS 2015 - Genova: Discovering Sustainable Ocean Energy for a New World

発行日 2015-09-17
DOI
関連識別子 10.1109/OCEANS-Genova.2015.7271487
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