This study is based on data from five field surveys (1992--1996) of seismic monitoring on Deception Island (South Shetland Islands, Antarctica). In the 1994--95 and 1995--96 surveys earthquakes were recorded by a seismic array. In previous surveys data were collected by a high-dynamic range, short-period station. The analysis of the events shows evidence of intermediate-focus seismicity [50> related to the underplating zone of the South Shetland plate. Because of poor station coverage we had to use unconventional techniques to locate the events, such as zero lag cross-correlation method that provide information about apparent velocity and back-azimuth, ray-tracing procedure and particle motion patterns. These criteria allowed us to identify 15 earthquakes that could be considered as intermediate-focus events, for which some focal parameters were estimated. We conclude that the subduction zone between the Drake plate and South Shetland microplate has a moderate level of intermediate-depth micro-seismicity.¿ 1997 American Geophysical Union