1969年4月以及1971年3—5月间在巽他大陆架北部到大纳土纳岛东及南方做了总计1160公里的连续地震剖面。看出一些盆地、脊状构造和一些断层,以及说明在亚洲大陆和加里曼丹之间有一个隆起存在的迹象。认出一个可能是中生代的低频率高速地层,以及可能和纳土纳砂岩同时代的一系列倾斜地层。残留的更新世的河道形式也很明显。 In April 1969 and March-May 1971, a total of 1,160 km of continuous seismic profiles were made in the northern part of the Stena Shelf to the east and south of Greater Natuna. Some of the basins, ridged structures and some faults are seen, along with indications of a bump in the continent and Kalimantan. Identify a low-frequency, high-velocity Mesozoic formation that may be of the Mesozoic age, as well as a series of slanted formations that may be contemporaneous with Natuna Sandstone. The remaining Pleistocene river forms are also evident.