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Ocean Floor Observatory Technology Development Group

Ocean Floor Observatory Technology Development Group

写真 Ocean Floor Observatory Technology Development Group
Deputy Group Leader
Eiichiro ARAKI

  • Research and development on construction and operation of an ocean floor observatory network
  • Development of real-time monitoring system using an ocean floor observatory network and long-term borehole observation
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Ocean Floor Observatory Technology Development Group

It is important to construct an observatory network on the seafloor that is capable of long-term, stable, real time and high-accurate stationary observation for improving trench-type earthquake and tsunami forecasting models and making use of them for disaster prevention and mitigation. To realize this, we are currently developing a dense oceanfloor network system for earthquakes and tsunamis (DONET). DONET is an observatory network that connects a number of observation systems consisting of seismometers and pressure gauges (tsunami gauges) by submarine cables and transmits the data to the landing station in real time. Our mission is to promote the DONET by technology development to install backbone cables and build observation networks using science nodes; research and development of underwater robot technologies; and development of methods for high-precision observation and the validation and evaluation of sensors. The installation of DONET1 has already been completed in 2011 and the construction of a larger-scale DONET2 has started on the seafloor off the coast of Tokushima Prefecture. In addition, we are performing research and development aiming for wide utilization of real-time observation platform technologies, for example, connection of the long-term borehole observatory installed by the scientifi c deep sea drilling vessel Chikyu to DONET.


figure1
DONET1 and DONET2. DONET1 that includes 20 observatories has been deployed on the epicentral area of the Tonankai earthquake and is currently performing data acquisition and real-time transmission, and DONET2 that includes 31 observatories is now under construction on the epicentral area of the Nankai earthquake. The backbone cable installation has been completed and the construction of observatories is currently under way.
figure2
Deep ocean fl oor real-time observation platform. The science nodes are connected to the backbone cable that utilized the submarine communications cable technologies in order to deploy a number of observatories using extension cables.