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[Observatory 1A-3 of DONET1 has been replaced with a new one]

2015/12/22

The observatory 1A-3 of DONET1 was installed in 2010. However, it has been replaced with a new one in Dec. 3-Dec. 12, 2015 because there was a control problem on a part of the seismometer package. We challenged to use a ship and an ROV that are not owned by JAMSTEC for the replacement operation and have succeeded in recovering the original one and deploying a new one safely. After the replacement, it was verified in the landing station that the seismometer package deployed is working correctly.

Fig.1 Chartered ship "KAIYU"

Fig.2 ROV "QUASAR 9" of NIPPON SALVAGE CO.

Fig.3 Recovery operation

Fig.4 Installation of a new seismometer package

Fig.5 The new observatory 1A-3 buried by sands