Detection of a recent large Hyuga-nada long-term slow slip event and estimation of its spatiotemporal slip distributions

Progress in Earth and Planetary Science

Table 1 L-SSEs and large earthquakes detected in the Hyuga-nada region in previous studies

Author	Analytical period	L-SSE occurrence period and number of L-SSE occurrences	Duration (year)	Maximum slip rate (cm/yr)	Mw	Earthquake occurrence date	Maximum amount of slip of an earthquake
This study	From January 1, 2017 to June 30, 2022	From 2018.5 to 2021.7 (the units are 0.1 years (= 36.5 days))	3.2	4.9	7.1
Yarai and Ozawa (2013)	From January 1, 1997 to July 20, 2010	From January 1, 2005 to January 1, 2006	1.0	5–6	6.7 to 6.8
		From January 1, 2007 to January 1, 2008	1.0	7–8
		From January 1, 2009 to January 1, 2010	1.0	4–5
Ozawa (2017)	From January 1, 2013 to April 10, 2016	From October 1, 2013 to May 1, 2014; two L-SSEs	0.58	8	6.4, 6.5
Ozawa (2017)	From January 1, 2013 to April 10, 2016	From July 1, 2015 to April 10, 2016; two L-SSEs	0.78	10	6.0, 6.4
Takagi et al. (2019)	From January 1, 1996 to December 31, 2017	From September 30, 1996 to November 8, 2014; 12 L-SSEs	0.40–1.67	15.5^a	6.4–7.0
Yagi et al. (2001)						October 19, 1996	6 cm
Yagi et al. (2001)						December 2, 1996	13 cm

^aThe maximum slip rate was determined by dividing the uniform slip amount of each L-SSE on its rectangular fault by its duration, and the largest value among the 12 L-SSEs is listed here