- Current Update, last updated Dec 3, 2013 09:10 HST:
No significant deformation was recorded; seismicity rates were slightly elevated through November.
Seismicity: Mauna Loa has had higher than normal seismicity in the past few months. Six shallow earthquakes were located below summit area with many more too small to formally review. The anomalous swarm to the west of Mauna Loa summit continued at low levels with ~8 events. In addition, there were 18 shallow events within the upper southwest rift, 1 shallow event within the lower southwest rift zone, and 1 shallow event within the northeast rift zone.
Deformation: There were no changes in deformation rates or patterns on Mauna Loa. There was no significant uplift and deformation continued to be dominated by southeasterly motion of the southeast flank.
Gas: No significant changes in SO2 or CO2 emissions were recorded by the Moku`aweoweo gas and temperature monitors during November. Fumarole temperature varied between 70-73 degrees C, except for a 1.5-day period beginning on 13 November when a precipitation-driven excursion took fumarole temperatures briefly down into the low 60s.
- Volcanic History Overview: Massive Mauna Loa shield volcano rises almost 9 km above the sea floor to form the world's largest active volcano. Flank eruptions are predominately from the lengthy NE and SW rift zones, and the summit is cut by the Mokuaweoweo caldera, which sits within an older and larger 6 x 8 km caldera. Two of the youngest large debris avalanches documented in Hawaii traveled nearly 100 km from Mauna Loa; the second of the Alika avalanches was emplaced about 105,000 years ago (Moore et al. 1989). Almost 90% of the surface of the basaltic shield volcano is covered by lavas less than 4000 years old (Lockwood and Lipman, 1987). During a 750-year eruptive period beginning about 1500 years ago, a series of voluminous overflows from a summit lava lake covered about one fourth of the volcano's surface. The ensuing 750-year period, from shortly after the formation of Mokuaweoweo caldera until the present, saw an additional quarter of the volcano covered with lava flows predominately from summit and NW rift zone vents.
- Location: Hawaii and Pacific Ocean, HI
Elevation: 4170 m
Recent Eruption: 1984
- Hazard Assessments: Mullineaux, Donal Ray; Peterson, Donald W., 1974, Volcanic hazards on the Island of Hawaii, Open-File Report 74-239.
- Link to monitoring data: Recent Earthquakes in Hawaii Page
Volcanic Alert Level: NORMAL Aviation Color Code: GREEN