Variability in ETAS parameters depending on estimation algorithms

The ETAS model (Ogata, 1988) allows us to estimate background seismicity \mu without aftershock effects from an earthquake sequence. As an interesting example, Llenos et al. (2009) showed that slow tectonic deformation truly increased the background seismicity \mu but did not correlate with the other ETAS parameters about aftershock productivity. Several studies such as Ide et al. (2013) expanded in application Kataoka and Mitsui (2015, JpGU) tested this concept for some regions around Japan, and obtained implications for magma intrusion beneath Mt. Fuji after the 2011 Tohoku Earthquake, slow slip events at subduction zones, and attenuation of slow slips after large earthquakes.