A seismic refraction experiment in the central Banda Sea
MetadataShow full item record
KeywordSeismic refraction method
A seismic refraction experiment in the central Banda Sea is interpreted by using both slope intercept and delay time function methods. The crustal structure is shown to be oceanic, with velocities (4.97, 6.47, 7.18, and 7.97 km/s) typical of oceanic layers 2, 3A, and 3B and the mantle. Individual layer thicknesses va ry systematica lly along the line, though the range of thicknesses observed for layers 2 ( 1.5-2.0 km) and 3A (2.0-3.5 km) falls well within the range observed for normal oceanic crust. Layer 3B is unusually thick (2.5-4.6 km), the result being slightl y greater than normal depths-to Moho of9-IO km below the sea floor. Shear head waves from layers 3A and 3B are identified on two receivers. In both cases, shear wave conversion occurred at the sediment/layer 2 interface. The observed shear wave velocities and intercepts indicate a Poisson's ratio of 0.25-0.28 in layer 3 and ~0.33 in layer 2. These and earlier results from the southern Banda basin indicate that the entire Banda Sea is underlain by oceanic type crust.
Also published as: Journal of Geophysical Research 83 (1978): 2247-2257
Suggested CitationTechnical Report: Purdy, G. Michael, Detrick, Robert S., "A seismic refraction experiment in the central Banda Sea", 1979-02, DOI:10.1575/1912/10396, https://hdl.handle.net/1912/10396
Showing items related by title, author, creator and subject.
Leverette, Steven John (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1977-07)In studying the earth with reflection seismics, one of the major unknowns is the velocity structure of the medium. Techniques used to determine the velocity structure commonly involve multi-channel arrays which measure ...
Funck, Thomas; Hopper, John R.; Larsen, Hans Christian; Louden, Keith E.; Tucholke, Brian E.; Holbrook, W. Steven (American Geophysical Union, 2003-11-19)We conducted a seismic refraction experiment across Flemish Cap and into the deep basin east of Newfoundland, Canada, and developed a velocity model for the crust and mantle from forward and inverse modeling of data from ...
Crustal structure across the Grand Banks–Newfoundland Basin Continental Margin – I. Results from a seismic refraction profile Lau, K. W. Helen; Louden, Keith E.; Funck, Thomas; Tucholke, Brian E.; Holbrook, W. Steven; Hopper, John R.; Larsen, Hans Christian (2006-03-03)A P-wave velocity model along a 565-km-long profile across the Grand Banks/Newfoundland basin rifted margin is presented. Continental crust ~36-kmthick beneath the Grand Banks is divided into upper (5.8-6.25 km/s), middle ...