Seismometrical Study of the Imaichi Earthquake on Dec. 26, 1949. : The second paper

概要

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The epicentre of second shock was located by the arrival times of P*, and compared with the epicentre obtained from P. They showed a fairly good concordance. The most probable values of coordinate of the epicentre are ψ=36°43'.7N and λ=139°39'.4E. The propagation velocity of P* obtained from the arrival times of the first shock and of the second shock turned out to be of nearly equal value, i.e. 6.0 km/s. h, the part of focal depth in the granitic layer of the first shock will be about 17km, so far as the arrival time of P at Utsunomiya is concerned. The thickness of the superficial layer ranges from 1.4km to 5km. Thus the focal depth of the first shock is estimated as 18km～22km. Accordingly, the focal depth of the second shock may probably be within the range from 14km to 18km.
1951-08-30