Geophysical Indicators of Gas Hydrate in the Northern Continental Margin, South China Sea
(a) Part of seismic line B that is parallel to seismic line A, which can show the continuous reflections of the sediments. Enhanced reflections are identified at the similar locations to seismic line A; (b) Coherence profile for the seismic line B showing the faults and subtle stratigraphic change. (c) Reflection strength profile for the line, showing loss of amplitude above the BSR and the enhanced reflection. (d) Instantaneous frequency profile shows high frequency above the interpreted BSR caused by the presence of gas hydrate and low frequency zone below the interpreted BSR caused by the presence of free gas.