Mathematics – Logic
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.121..195p&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 121, no. 1-2, p. 195-211
Mathematics
Logic
8
Crack Propagation, Geological Faults, Magnetic Anomalies, Mid-Ocean Ridges, Ocean Bottom, Sea Floor Spreading, Magma, Mathematical Models, Morphology, Pacific Ocean, Sonar, Stress Intensity Factors
Scientific paper
In September of 1987 nwe completed a SeaMARC II (SMII) survey of the propagating spreading center located at 87 deg 30 min W on the Galapagos Spreading Center (GSC). The spreading rate in the area is intermediate with a full rate of approximately 70 mm/yr and the spreading axis is marked by an axial high. Analysis of bathymetry, sidescan sonar and surface magnetic data indicates 90 - 100 mm/yr eastward propagation of the 26 km offset. The morphology of the feature is that of an overlapping spreading center pair (OSC). It fits a kinematic model of overlapping ridges with cyclic failure of the dying rift. There are marked differences in the morphology and kinematics of the propagator compared to the propagator at 95 deg 30 min W where the spreading rate and offset are comparable. The 87 deg 30 min W propagator is marked by an axial high and greater than 40 km of overlap in contrast to the axial rift valley and small amount of overlap associated with the 95 deg 30 min W propagator. Near-field stresses associated with variable axial topography contribute to decrease crack propagation forces at the 95 deg 30 min W propagator and increase those at the 87 deg 30 min W propagator. Differences in crack propagation forces and morphology may be due to a fundamental difference in the amount of available magma. This difference is evident in dominance of volcanism near 87 deg 30 min W as opposed to the dominance of tectonism near 95 deg 30 min W.
MacDonald Ken C.
Perram Laura Jean
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