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Epicentral time and surface structure determined for the Tango earthquake, Japan, March 7, 1927

GEOPHYSICAL LABORATORY SAINT LOUIS UNIVERSITY

Abstract

It is concluded that: The major energy of the Tango earthquake, causing the elastic waves which registered on seismographs all the world over, was released at 9^h 27^m 44^s, G.M.T., March 7, 1927, from a single focus about 12 kilometers below the epicenter, which lay some 7 kilometers southwest of the Gomura fault and about 12.5 kilometers northwest of the Yamada fault, that is to say at 35° 36'.4 N., 134° 58'.2 E., in a surface stratum only some 16 kilometers thick, in which the velocity of the longitudinal wave has the unusually high average value of 6.3 kilometers per second, the velocity for the same wave below the discontinuity being 7.75 kilometers per second and about the inner edge of the mantle at its contact with the core 12.4 kilometers per second. The P- and S-curves of the previous paper are to be subjected to a constant correction of — 11 seconds in the light of the foregoing results, which indicate an epicentral time of 9^h 27^m 46^s instead of the tentatively assumed 9^h 27^m 35^s. Arguments are advanced for believing the corrected P-curve for the Tango earthquake to be reasonably well established except for a range of several degrees on each side of an epicentral distance of 20°.

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