Development of Seafloor Geodetic Observation System Based on AUV Technology

2007 ◽  
Author(s):  
Masashi Mochizuki ◽  
Akira Asada ◽  
Tamaki Ura ◽  
Teruki Tanaka ◽  
Hong Zheng ◽  
...  
Keyword(s):  
Observation System ◽  
Geodetic Observation ◽  
Seafloor Geodetic Observation

Development of seafloor geodetic observation system based on AUV and submarine cable technologies

2010 ◽  
Author(s):  
Masashi Mochizuki ◽  
Akira Asada ◽  
Tamaki Ura ◽  
Zengo Yoshida ◽  
Kenichi Asakawa ◽  
...  
Keyword(s):  
Observation System ◽  
Submarine Cable ◽  
Geodetic Observation ◽  
Seafloor Geodetic Observation

scholarly journals Crustal Deformation Detection Capability Associated With a Fault Slip on the Interplate Boundary in the Gnss-a Seafloor Geodetic Observation Array (SGO-A), Provided By Japan Coast Guard

2021 ◽  
Author(s):  
Yusuke Yokota ◽  
Tadashi Ishikawa ◽  
Sun-ichi Watanabe ◽  
Yuto Nakamura
Keyword(s):  
Standard Deviation ◽  
Crustal Deformation ◽  
Deformation Rate ◽  
Coast Guard ◽  
Detection Sensitivity ◽  
Japan Trench ◽  
Detection Capability ◽  
Geodetic Observation ◽  
Seafloor Geodetic Observation ◽  
Slip Event

Abstract The GNSS-A technique is an observation method that can detect seafloor crustal deformations with centimeter level accuracy. The GNSS-A seafloor geodetic observation array operated by the Japan Coast Guard, called SGO-A, has been constructed near the Japan Islands along the Nankai Trough and the Japan Trench. This observation array has detected several earthquakes’ displacements and episodic slow crustal deformation. To compare the detection results of SGO-A with other observation networks and expand the SGO-A distribution, it is necessary to correctly understand its detection capability. In this paper, the capabilities of current GNSS-A (frequency: f = 4–6 times/year, position accuracy: σ (standard deviation) = 1.5 cm) to detect a crustal deformation rate only, an event only, and crustal deformation rate and event together were arranged by numerical simulations. Results suggested the following features: when it is known that there is no event, the 95% confidence level (CL) for the estimation of crustal deformation rate with 4-year observation is about 0.5–0.8 cm/year; when the deformation rate is known, a signal of about 3.0 cm can be detected by observations of about 4 times before and after the event. When the deformation rate and the event are detected together, to keep the false positive low (about 0.05), the false negative becomes high (about 0.2–0.7 for detecting a signal of 4.5–6.0 cm). The determined rate and event variations are approximately 1.8 cm/year (95%CL) and 1.5 cm (standard deviation), respectively. We also examined the detection capability for higher frequency and accuracy, to examine how the detection capability improves by technological advancements in the future. Additionally, we calculated the spatial range of event detectability using the determined values of detection sensitivity. Each seafloor site can detect a slip event larger than 0.1 m scale within about 50 km radius. A subseafloor slip event smaller than about 1 m at the distance of 100 km or more from the land can often be detected only on the seafloor observation array.

scholarly journals Heterogeneous interplate coupling along the Nankai Trough, Japan, detected by GPS-acoustic seafloor geodetic observation

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Yusuke Yokota ◽  
Tadashi Ishikawa ◽  
Mariko Sato ◽  
Shun-ichi Watanabe ◽  
Hiroaki Saito ◽  
...  
Keyword(s):  
Nankai Trough ◽  
Geodetic Observation ◽  
Seafloor Geodetic Observation ◽  
Interplate Coupling

scholarly journals Restoration of interplate locking after the 2005 Off-Miyagi Prefecture earthquake, detected by GPS/acoustic seafloor geodetic observation

2011 ◽  
Vol 38 (1) ◽  
pp. n/a-n/a ◽  
Author(s):  
Mariko Sato ◽  
Hiroaki Saito ◽  
Tadashi Ishikawa ◽  
Yoshihiro Matsumoto ◽  
Masayuki Fujita ◽  
...  
Keyword(s):  
Geodetic Observation ◽  
Seafloor Geodetic Observation ◽  
Miyagi Prefecture

scholarly journals Undersea co-seismic crustal movements associated with the 2005 Off Miyagi Prefecture Earthquake detected by GPS/acoustic seafloor geodetic observation

2006 ◽  
Vol 58 (12) ◽  
pp. 1573-1576 ◽  
Author(s):  
Yoshihiro Matsumoto ◽  
Masayuki Fujita ◽  
Tadashi Ishikawa ◽  
Masashi Mochizuki ◽  
Tetsuichiro Yabuki ◽  
...  
Keyword(s):  
Geodetic Observation ◽  
Crustal Movements ◽  
Seafloor Geodetic Observation ◽  
Miyagi Prefecture

scholarly journals Geokinematics in GGOS - Different Relations and Dependences

2011 ◽  
Vol 46 (1) ◽  
pp. 9-17
Author(s):  
Wojciech Pachelski ◽  
Małgorzata Paśnicka ◽  
Karolina Szafranek ◽  
Agnieszka Zwirowicz-Rutkowska
Keyword(s):  
Observation System ◽  
Full Description ◽  
Modelling Language ◽  
Information Modelling ◽  
Geodetic Observation ◽  
Preliminary Results ◽  
Unified Modelling Language ◽  
Graphical Notations ◽  
The One ◽  
Geometry And Kinematics

Geokinematics in GGOS - Different Relations and Dependences The paper presents the preliminary results of the analysis of fundamental dependencies between different geodetic concepts related to the one of the GGOS (Global Geodetic Observation System) pillars called Geometry and Kinematics. These relationships are described using UML (Unified Modelling Language) - one of the graphical notations that can be used for information modelling. Concepts are represented as classes with their names, attributes, and different kinds of links between them. The main purpose of this paper is to introduce the full description of connections between all GGOS components.

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