Table 4.

Vb Clustering (C) and Hiatus (H) Periods 1959–2016, With Beginning and End Dates, Duration, Mean Interarrival Times T, Number of Arrivals, and the Ratio (fR) of Arrival Rates and the Mean Rate of 9.77 year⁻¹

C/H	Beginning	End	Duration (months)	T (days)	Number of arrivals	fR (%)
C1	1960 08 11	1961 02 20	6.33	14.9	14	271
C2	1962 11 08	1963 05 04	5.80	11.8	16	338
C3	1964 10 13	1965 08 24	10.33	16.6	20	237
C4	1968 11 17	1971 01 03	25.48	23.5	34	164
C5	1976 09 13	1977 05 07	7.74	13.1	19	301
C6	1978 11 26	1979 06 23	6.85	17.4	13	233
C7	1981 04 16	1981 11 28	7.41	15.1	16	265
C8	1990 11 22	1991 06 17	6.79	18.8	12	217
C9	2000 07 09	2001 09 17	14.26	19.8	23	198
C10	2010 07 22	2010 11 29	4.26	14.4	10	288
C11	2012 04 11	2013 06 25	14.43	23.2	20	170
H1	1961 02 20	1961 10 18	7.87	60.0	4	62
H2	1966 11 24	1968 03 02	15.21	154.7	3	24
H3	1971 01 03	1974 02 03	36.95	75.1	15	50
H4	1975 06 09	1976 09 13	15.15	92.4	5	40
H5	1977 05 07	1978 01 28	8.72	133.0	2	28
H6	1981 11 28	1983 12 19	24.62	93.9	8	40
H7	1988 03 21	1996 11 17	103.71	52.7	60	71
H8	2001 09 17	2002 05 26	8.23	83.7	3	45
H9	2006 08 13	2007 05 05	8.69	88.3	3	42
H10	2010 11 29	2012 04 11	16.36	99.8	5	37
H11	2014 11 19	2015 08 01	8.36	127.5	2	29

Note. Dates are in the format year month day.