In this paper, the regional geologic setting and seismic hazard of Brunei Darussalam are outlined; the earthquake monitoring system and to ability to record, process and analyze seismic events in surrounding areas are described; and some results of epicenter determinations by the monitoring system are given (Appendices I and Ⅱ). In this paper, the regional geologic setting and seismic hazard of Brunei Darussalam are outlined; the earthquake monitoring system and to ability to record, process and analyze seismic events in surrounding areas are described; and some results of epicenter determinations by the monitoring system are given (Appendices I and II).