3:45 PM - 4:00 PM
[SVC47-08] Failed eruption observed by seismic arrays during the Sakujirama volcano activity on Aug. 15, 2015.
Keywords:Sakurajima, magma intrusion, VT earthquakes
Temporal change of cross-correlation factors of these seismic waveforms indicate that there are three different periods, i.e., A: 6:00 - 10:30, B: 10:30 - 12:00, and C: 12:00 - 24:00. There are no familiy waves between these three periods. In A period, many family earthquakes were observed but not in B period. During C period, some pairs separated as long as hours have high cross-correlation factors. It is implicated that, in the A period, some similar fault slip occurred successively in the inital phase of dike intrusion, in the B period, VT events may suggest random fractures, and there occured some similar slips all around the intruded dike in the C period.