Tonga earthquakes in 1975

134 earthquakes of magnitude 4.5 or more were located in Tonga in 1975. The largest: M7.8 146 km ESE of Hihifo, Tonga, Dec 26, 1975.

From the USGS catalog. Times are local to each quake.

1974 1976

Map

Where every quake of 1975 was located in Tonga. Select one for its page.

Open the live map with earthquakes

Every quake of 1975

Magnitude 4.5 and up, newest first.

The largest

The 25 largest of 1975 in Tonga.

Month by month

Counted by UTC date, which is how the catalog files them.

Month	Quakes	Largest	Where
January 1975	6	5.8	103 km NW of Neiafu, Tonga
February 1975	6	5.1	142 km SW of Hihifo, Tonga
March 1975	12	5.4	76 km SSE of Pangai, Tonga
April 1975	10	5.6	187 km S of ‘Ohonua, Tonga
May 1975	15	6.0	108 km ENE of ‘Ohonua, Tonga
June 1975	11	5.4	90 km SSE of Pangai, Tonga
July 1975	6	5.7	85 km E of ‘Ohonua, Tonga
August 1975	7	5.6	189 km NW of Neiafu, Tonga
September 1975	7	6.5	88 km SSE of Pangai, Tonga
October 1975	19	7.8	south of Tonga
November 1975	11	5.7	189 km SE of Hihifo, Tonga
December 1975	24	7.8	146 km ESE of Hihifo, Tonga

What this means

The catalog is only as complete as the instruments of the time. Worldwide coverage of magnitude 5 and up dates from the 1960s, and of 4.5 from the 1990s; earlier years hold the large quakes and the ones near a station, so a low count in an early year means fewer instruments, not a quiet earth.

By year

Every year the USGS catalog covers.

2020s2020 2021 2022 2023 2024 2025 2026
2010s2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
2000s2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
1990s1990 1991 1992 1993 1994 1995 1996 1997 1998 1999
1980s1980 1981 1982 1983 1984 1985 1986 1987 1988 1989
1970s1970 1971 1972 1973 197419751976 1977 1978 1979
1960s1960 1961 1962 1963 1964 1965 1966 1967 1968 1969
1950s1950 1951 1952 1953 1954 1955 1956 1957 1958 1959
1940s1940 1941 1942 1943 1944 1945 1946 1947 1948 1949
1930s1930 1931 1932 1933 1934 1935 1936 1937 1938 1939
1920s1920 1921 1922 1923 1924 1925 1926 1927 1928 1929
1910s1910 1911 1912 1913 1914 1915 1916 1917 1918 1919
1900s1900 1901 1902 1903 1904 1905 1906 1907 1908 1909

Nearby

Tonga now Worldwide in 1975

Sources

Earthquakes, magnitudes, depths, shaking estimates and felt reports from the U.S. Geological Survey Earthquake Hazards Program, read from its live feeds and its catalog back to 1900. Tsunami messages from NOAA’s tsunami warning centers.