The scientific importance of long-term ocean-floor seismic observatories has been widely and internationally recognized by earth science communities. In addition to their usefulness in investigating global-scale geophysical processes, long-term ocean-floor observations are also required to better constrain regional tectonics. However, the implementation of ocean-floor seismic stations is a difficult task, and efforts have been made for more than two decades to resolve the technological and logistical issues associated with such deployments (Romanowicz et al. 2009; Suyehiro et al. 2006). Different programs in the United States and Canada (e.g., NEPTUNE Project, http://www.neptune.washington.edu), Japan (e.g....

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