[S-SS12] Seismicity

[SSS12-P11] Research on seismicity in Japan utilizing ultra-microeathquake data in the JMA unified earthquake catalog

*Kenshiro Tsumura¹ (1.Association for Developement of Earthquake Prediction)

Keywords:seismicity, ultra-microearthquake, time-circle diagram

The JMA unified earthquake catalog contained more than 1 milion ultra-microearthquake hypocenter data for the past 20years. But the data has not been used mainly due to spatial and temporal incompleteness.
In this study, usefulness of the data for the research on seismicity in Japan has been proved , if we utilize them
adequately. The time-circle diagram (TC-map) method can be used for analysis of such large amout of hypocenter data.