Seismic Studies on the Ontong Java Plateau, 1970.

摘要

Marine seismic studies were conducted over the Ontong Java Plateau in the south-western Pacific Ocean during 1970 using two ships. Seismic refraction surveys revealed that crustal thickness of the plateau ranges from 35 to 42 km. A high-velocity basal crustal layer was detected in the northern part of the plateau but not in the southern part. Seismic reflection profiling showed the sediments to be about 1.5 km thick. In the sedimentary column were numerous intrusions with very little magnetic expression. These intrusions are probably not of igneous origin. There is a large discrepancy between observed gravity values and theoretical values calculated from the crustal structure. (Author)