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Richter 6.0 or greater
events. There was a
Richter 7.0 on 3/14/1994
in the cluster along the
Equator at about 23
degrees west.
The event in Gabon was
a Richter 6.2 on
9/23/1974. There was
also a 6.5 on 7/10/1862;
a 6.8 on 6/22/1939
(offshore); and 6.2 on
9/12/1945. Epicenters,
depths and Richters on
older events tend to be
less reliable.
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Gabon has one other worry - Mount Cameroon to the north is one of the
largest African volcanoes and has the most frequent eruptions of any
West African volcano: the Atlantic Ocean has been reached by lava
flows. While lahars and pyroclastic flows can be locally lethal, the real
danger is ash clouds - as Europe discovered recently and as New
Zealand and Australia are leaning courtesy Puyahue in Chile. We note
in passing that the role of volcanic and seismic activity in the deadly
Lakes Nyas and Monoun overturns in the 1980s is not understood yet.
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