Relation between earthquake swarm activity and tides in the Noto region, Japan

Earth, Planets and Space

Table 1 Declustering results

Region	# of events		t_th (h)	Test period (swarm period)
	Original	After declustering		Test period (swarm period)
	Original	After declustering		(yyyy/mm/dd)
N	3528	7 (19)	48	2021/6/1–2022/12/31
E	1521	32 (45)	48	2021/8/1–2022/12/31
W	630	26 (28)	120	2021/2/1–2022/12/31
Ss	203	95 (156)	12	2021/9/1–2022/12/31
Sd	320	60 (66)	24	2020/11/1–2022/2/28

Number of events for which the null hypothesis that ‘declustered seismic activity is a stationary Poisson process’ could not be rejected at the significance level of 5% after the declustering method was applied to events during the swarm period (i.e., declustering was successful). The numbers in parentheses, which show the number of earthquakes remaining after the declustering method was applied to the entire period (1 January 2018 to 31 December 2022), were used in this analysis