Fig. 5.8 Pillow lava from the East Pacific Rise axis at 12°50
0 N taken at 2628 m depth showing
surface corrugations and lateral small protrusions of ‘‘yam’’ like glassy flows. (Copyright
IFREMER, Geocyarise Cruise 1984, Cyana dive Cy84–24.)
Fig. 5.9 Accumulation of lava tubes during eruption forms small volcanic structures that
resemble a ‘‘haystack’’. Photograph was taken during by the submersible Cyana on an off-axial
volcano at 2534 m depth called the Southeastern seamount, located at 6 km from the axial graben
of the EPR at 12°43
0 N). Lava has flowed down from a summit orifice (‘‘trap-door’’) located on
top of the cone to form a haystack about 3 m tall. Haystacks are also found on top of a volcanic
fissured or rift zone. (Copyright IFREMER, Geocyatherm cruise 1982, Cyana dive Cy82-14)
Lava Morphology
119
0 N taken at 2628 m depth showing
surface corrugations and lateral small protrusions of ‘‘yam’’ like glassy flows. (Copyright
IFREMER, Geocyarise Cruise 1984, Cyana dive Cy84–24.)
Fig. 5.9 Accumulation of lava tubes during eruption forms small volcanic structures that
resemble a ‘‘haystack’’. Photograph was taken during by the submersible Cyana on an off-axial
volcano at 2534 m depth called the Southeastern seamount, located at 6 km from the axial graben
of the EPR at 12°43
0 N). Lava has flowed down from a summit orifice (‘‘trap-door’’) located on
top of the cone to form a haystack about 3 m tall. Haystacks are also found on top of a volcanic
fissured or rift zone. (Copyright IFREMER, Geocyatherm cruise 1982, Cyana dive Cy82-14)
Lava Morphology
119