We have developed a monitoring system for seafloor deformation during Methane Hydrate production test. Seafloor deformation is monitored by measuring subsidence and inclination of the seafloor. Subsidence is measured with change of water pressure on the seafloor. An inclinometer we selected is applied liquid electrolyte. According to simulation of seafloor deformation around the production hole, the range of subsidence will be from 0.1 m to 0.3 cm. This system has been installed and monitored on the seafloor at East Nankai trough during the production test of Methane Hydrate. We will continue the measurement by September 2013.

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