A brief introduction to DONET in Japan

Significant progress has been made in the seismological observation in China recently, with a good start for the construction of ocean-floor observatories. The successes in the ocean-floor observing systems worldwide can serve China as good examples. Dense Ocean floor Network system for Earthquakes and Tsunamis （DONET） of Japan was built in 2011. This system focuses on observing the seafloor ground motion and hydraulic pressure signals efficiently, aiming at monitoring the earthquake and tsunami events in the Nankai Trough region. This paper provides a brief review into the hardware layout, construction procedures, and related scientific researches of the DONET, which can serve as good experiences for the Chinese counterparts. Lastly, we introduce details of the National Seafloor Observatory Network Project in China.