An elongate system of crustal fractures associated with an area that has
undergone extension (ground has spread apart). On the great shield
volcanoes in Hawai'i, a rift zone consists of many different features
associated with the rise and eruption of magma from narrow dikes, including eruptive fissures, cinder and spatter cones, spatter ramparts, pit
craters, lava flows, ground cracks,
and normal faults.
|Aerial view of the northeast rift zone of Mauna Loa
Volcano, Hawai'i. Dark lava flows spread away from the rift zone.
Credit: J. P. Lockwood / U.S. Geological Survey
AND PLANETARY SCIENCE
Source: U.S. Geological Survey