5:15 PM - 6:30 PM
[SCG21-P11] Relationship between coupling and tremor rate in the region adjacent to the Bungo Channel SSE area
Keywords:Slow earthquake, deep low-frequency tremor, interplate coupling
Ochi (EPSL, 2015) analyzed daily GNSS coordinates from 1997.0 to 2011.0 and inferred temporal evolution of the interplate coupling and long-term SSE. According to the results, the interplate coupling in the region on the east of the 2010 Bungo Channel SSE area strengthened in synchronization with the SSE. On the other hand, AIST makes the tremor catalog in this area after July 2008 using envelope correlation method (Maeda and Obara, JGR, 2009). According to the tremor catalog, the tremor active rate in this region increased after 2011 when the long-term SSE terminated. The increased active rate continues around mid-2014 and decreased to the level that was almost the same as before 2011. Because the long-term SSE occurred again after mid-2014 (GSI, Report of CCEP, 2015), decrease of the tremor active rate seems to coincide with the long-term SSE in the adjacent area. We will discuss the relationship between coupling rate after 2011 and the tremor active rate in this region.