Global distribution of volcanic centers and mountains on Io: Control by asthenospheric heating and implications for mountain formation

摘要: Abstract Jupiter's moon Io possesses numerous tectonic mountains in addition to its ubiquitous volcanoes and volcanic features. Remarkably, a distinct global anticorrelation exists between the spatial distribution of centers on Io. This relationship indicates an explicit connection volcanism mountain formation, even though are origin (predominantly upthrusted crustal blocks). Spherical harmonic analysis shows have statistically significant power at degree 2; this result is especially striking for center distribution, directly implicates models asthenospheric tidal heating. The latter predict enhanced heat flux along equator degree-two pattern that matches observations. Mountain formation appears be form dominantly vertical tectonism unique modern Solar System: continual burial by widespread drives crust inward, which leads strong compression, discrete locations, mountains. Correlation coefficients distributions indicate meaningful low spectral degrees (l = 1, 2, 4, 6); longitudinal (sectorial) l = 2 components when considered their own. We compare with published link volcano formation. While consistent part convection models, such (in principle), anticorrelations also (if not more) compatible due to, or influenced by, thermal expansion Io's crust, deep compression thrust faulting regions lower than average heat-piping. Positive correlations high may reflect structural links good fraction blocks adjacent paterae, whereas implies most features (which far more overall) independently