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A new seafloor cable-type observation network in the western half of the anticipated Nankai Trough earthquake source area: N-net

Urheber*innen

Aoi,  Shin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Takeda,  Tetsuya
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kunugi,  Takashi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Shinohara,  Masanao
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Miyoshi,  Takayuki
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Uehira,  Kenji
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Mochizuki,  Masashi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Takahashi,  Narumi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Zitation

Aoi, S., Takeda, T., Kunugi, T., Shinohara, M., Miyoshi, T., Uehira, K., Mochizuki, M., Takahashi, N. (2023): A new seafloor cable-type observation network in the western half of the anticipated Nankai Trough earthquake source area: N-net, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1127


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018118
Zusammenfassung
The area off the Pacific Ocean in eastern Japan has already been densely monitored by S-net, and in western Japan by DONET and the JMA's Tokai and Tonankai cables. However, the area from off Kochi to the Hyuga-nada, which is the western half of the anticipated Nankai Trough earthquake source area, is a blank area of observation. To eliminate the blank, NIED is now constructing Nankai Trough Seafloor Observation Network for Earthquakes and Tsunamis (N-net). N-net consists of two subsystems, one inshore and one offshore, connecting two landing stations. Each subsystem has 18 observatories connected by a fiber-optic cable approximately 700 to 800 km long, for a total of 36 observatories. N-net is designed as a hybrid system based on the inline system, but with the plug-in node system that allows for future addition of observation equipment. Each observatory is equipped with two pressure gauges for tsunami observation and two accelerometers and short-period velocity meters for earthquake observation to ensure redundancy. For installation on the N-net, NIED has developed a pressure gauge that is less susceptible to pressure measurement due to seismic shaking and attitude fluctuation, a pressure-resistant enclosure that transmits pressure accurately, and an implementation of IP packets on SDH payloads. The observed data will be transmitted to JMA in real time and used for early warning of earthquakes and tsunamis. Offshore system will be laid till 2024, and the construction will be expected to be finished till the spring of 2025.