Table 3 Number of tephra recovered by OD per year.
From: VOLCORE, a global database of visible tephra layers sampled by ocean drilling
Year | Total tephra | Year | Total tephra |
|---|---|---|---|
1968 | 45 | 1994 | 344 |
1969 | 206 | 1995 | 1110 |
1970 | 88 | 1996 | 2631 |
1971 | 353 | 1997 | 106 |
1972 | 282 | 1998 | 599 |
1973 | 307 | 1999 | 787 |
1974 | 151 | 2000 | 651 |
1975 | 29 | 2001 | 203 |
1976 | 50 | 2002 | 595 |
1977 | 509 | 2003 | 51 |
1978 | 1089 | 2004 | 2 |
1979 | 280 | 2005 | 18 |
1980 | 48 | 2006 | 0 |
1981 | 252 | 2007 | 148 |
1982 | 359 | 2008 | 160 |
1983 | 667 | 2009 | 1362 |
1984 | 0 | 2010 | 31 |
1985 | 172 | 2011 | 881 |
1986 | 226 | 2012 | 921 |
1987 | 1135 | 2013 | 1734 |
1988 | 416 | 2014 | 9212 |
1989 | 1661 | 2015 | 96 |
1990 | 700 | 2016 | 1800 |
1991 | 201 | 2017 | 405 |
1992 | 1112 | 2018 | 421 |
1993 | 90 |
