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

Content Provider	IEEE Xplore Digital Library
Author	Shinohara, M. Yamada, T. Ishihara, T. Araya, A. Kanazawa, T. Fujimoto, H. Uehira, K. Tsukioka, S. Omika, S. Iizasa, K.
Copyright Year	2015
Description	Author affiliation: Japan Agency for Marine-Earth Sci. & Technol., Yokosuka, Japan (Tsukioka, S.; Omika, S.) \|\| Nat. Res. Inst. for Earth Sci. & Disaster Prevention, Tsukuba, Japan (Kanazawa, T.; Fujimoto, H.; Uehira, K.) \|\| Grad. Sch. of Frontier Sci., Univ. of Tokyo, Kashiwa, Japan (Iizasa, K.) \|\| Earthquake Res. Inst., Univ. of Tokyo, Tokyo, Japan (Shinohara, M.; Yamada, T.; Ishihara, T.; Araya, A.)
Abstract	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 Eötvös 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.
Starting Page	1
Ending Page	7
File Size	2947921
Page Count	7
File Format	PDF
e-ISBN	9781479987368
DOI	10.1109/OCEANS-Genova.2015.7271487
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-05-18
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gravity measurement Gravity Underwater vehicles Sea measurements Instruments Acceleration Noise underwater measurement gravity gravimeter gradiometer AUV
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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