This ocean-facing scarp and lava bench was formed when the
leading edge of the delta subsided about 1 m into the sea.
Note the prominent crack in the lower left on the delta side
of the scarp -- such cracks often but not always develop
just before the delta either subsides or collapses into
the sea. The spatter and tephra deposits on the bench
(lower right) are from small explosions at the edge of
the bench.
|