On the basis of bathymetric an seismic data collected recently off the coast of Makran in the Gulf of Oman, it has been suggested that the folding of the sediments at the northern edge of the abyssal plain is taking place at the present time. The folding is thought to be the consequence of ongoing subduction of the Arabian plate beneath the Eurasian Lithosphere along the Makran coast. Th model assigns a far more significant role to the Makran coast in shaping the tectonics of the region than has thus far been assumed. In order to examine whether, despite the lack of teleseismically observable seismicity, the suggested deformation is associated with any microearthquake activity or not, a network of high gain-seismographs, including three OBS's was installed near the western end of the Makran coast in May 1977 and operated for about two weeks. During the observation period no noticeable microearthquake activity associated with the suggested boundary was observed. Nearly 40 of the earthquakes located by the network data are aftershocks of the destructive earthquake which occurred on March 21, 1977, north of Bandar-Abbas, more than 400 km from the OBS's. From the observed travel times of the three 180 kilogram explosions set off for regional calibration, a 20 km thick two layered oceanic crust was obtained.