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One of long-standing problems with underwater seismic studies is the inaccurate timing because the internal clock of Ocean Bottom Seismograph(OBS)is unable to synchronize with GPS.Here we present corrections of large clock error and temporal drift in a passive-source OBS array experiment in South China Sea by cross-correlating hydrophone records of each OBS pair.We show that the hydrophone on the OBS is more effective to retrieve the Scholte waves,the leaky energy along the fluid-solid interface at seafloor,than the seismometers due to the fact that hydrophones are situated above the seafloor,thus less affected by the solid-mode Rayleigh wave and have higher signal to noise ratio.We employ a two-step approach to tackle those large errors:first we use predicted time of P phase from many earthquakes to roughly correct the time,and use the cross-correlating hydrophone recordings to fine-tune the drift.We find,during the seven month deployments from April2012to November2012,there were large clock errors as well as pronounced temporal clock k drifts.