Block motion changes in Japan triggered by the 2011 great Tohoku earthquake
作者： Brendan J. Meade , John P. Loveless
DOI: 10.1002/2017GC006983
关键词: Seismology 、 Mantle (geology) 、 Earthquake cycle 、 Plate tectonics 、 Static stress 、 Geology 、 Crust 、 Thermodynamic equilibrium
摘要: Plate motions are governed by equilibrium between basal and edge forces. Great earthquakes may induce differential static stress changes across tectonic plates, enabling a new state. Here we consider the torque balance for idealized circular plates find simple scalar relationship in relative plate speed as function of its size, upper mantle viscosity, coseismic changes. Applied to Japan, 2011 MW = 9.0 Tohoku earthquake generated stresses 102 – 105 Pa that could have induced motion small (radius ∼ 100 km) crustal blocks within Honshu. Analysis time-dependent GPS velocities, with corrections cycle effects, reveals speeds changed up 3 mm/yr 3.75-year epochs bracketing this earthquake, consistent an viscosity 5 × 1018 Pa·s, suggesting great modulate proximal at frequencies high 10−8 Hz.
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