Seabed crustal movement observation device
An observation device and a technology for crustal changes, which are used in measurement devices, mapping and navigation, and inclination measurement, etc., can solve the problems of reduced observation accuracy of crustal changes, and long time required for compaction and convergence of sediments.
Pending Publication Date: 2021-04-20
HITACHI ZOSEN CORP
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Problems solved by technology
However, when the spindle part is installed on deposits such as silt, clay, sand, etc. (the seabed is soft), the volume of the deposits will change due to the outflow of interstitial water directly under the spindle part, that is, deposits will occur. compaction (compaction of seabed formations) and takes a long time to converge
In this case, the position of the spindle part as an observation point changes over a long period of time due to compaction and settlement, resulting in a decrease in the accuracy of observation of crustal fluctuations
Method used
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[0025] figure 1 It is a figure which shows the structure of the submarine crustal fluctuation observation apparatus 1 which concerns on one Embodiment of this invention. The submarine crustal fluctuation observation device 1 is a device in which a spindle unit 2 described later is installed on deposits such as silt, clay, sand, etc. on the seabed, and observes the displacement of the observation spindle unit 2 that moves integrally with the seabed formation.
[0026] The submarine crustal fluctuation observation device 1 includes a spindle unit 2 , a mooring unit 3 , a support body 4 , and a position measurement unit 5 . The spindle unit 2 is an anchor (sinker) installed on the seabed, and has a substantially plate shape or a substantially block shape. The weight of the spindle unit 2 is, for example, several tens of tons. The spindle unit 2 will be described later. The mooring unit 3 includes a connection unit 31 and a floating body 32 . For example, the connecting portio...
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The invention relates to a seabed crustal movement observation device. The seabed crustal movement observation device is provided with a spindle part (2) arranged on the seabed. The spindle part (2) is provided with a spindle part main body (21) which is roughly plate-shaped or roughly block-shaped; a discharge hole (22) penetrating through the spindle part main body (21) in the vertical direction; and an entry suppression unit (23) that is provided inside the discharge hole (22) or in the lower opening (222) and that suppresses entry of particles of seafloor deposits into the discharge hole (22). Therefore, when the spindle part (2) is arranged on deposits such as sludge, clay, sand and the like on the seabed, the interior of the discharge hole (22) can be prevented from being buried by particles of the deposits, and interstitial water of the deposits can be appropriately discharged from the discharge hole (22). As a result, the time required for convergence can be shortened when the accumulation is compacted by the spindle part (2).
Description
technical field [0001] The invention relates to a seabed crustal fluctuation observation device. Background technique [0002] Currently, GPS is generally used on land to observe crustal changes. In recent years, techniques for observing crustal fluctuations accompanying submarine volcanic activity have been sought in order to determine the stop criteria of nuclear power plants and the like. For example, the marine observation system MEDUSA (Multiparametric Elastic-beacon Devices and Underwater Sensors Acquisitionsystem; Multiparametric Elastic Beacon Devices and Underwater Sensors Acquisitionsystem) is used at the Italian National Institute of Geophysical Volcanology (INGV) to monitor seismic activity and seabed The activity of the formation (“MEDUSA”, [online], 2019, Italian National Institute of Geophysics and Volcanology (INGV), [retrieved October 3, 2019], reference Internet <URL: http: / / portale2. ov.ingv.it / medusa / >). In MEDUSA, one end of the steel cable is c...
Claims
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Login to View More IPC IPC(8): G01S19/14G01S19/42G01C9/00
Inventor 冈本丰正木洋二田中博己
Owner HITACHI ZOSEN CORP