鳥取市近辺の地震の臨時観測について(1)

Abstract

On researching seismicity near Tottori city, a temporary station at Shimosunami-cho and atripartite seismometer net with a span about 1 Km along the Yoshioka fault, produced by the Tot~tori earthquake of 1943, were set up.The pattern of the distribution of microearthquakes hypocenters is almost same as the after-shocks area of the Tottori earthquake of 1943. And no hypocenter is found in the sea.Along the Yoshioka and Shikano faults, there are few microcarthquakes but at both ends andbelow the bottom of the faults, pretty many earthquakes.The crustal structure agrees with assumed one. But locally there is some difference, especiallytop surface layer with lower velocity, that derived from the results of tripartite observation.