- Current Update, last updated Mar 9, 2014 07:54 HST:
No significant deformation was recorded; seismicity rates were slightly elevated through February, 2014.
Seismicity: Mauna Loa has had higher than normal seismicity in the past few months. Five shallow earthquakes were located below summit area with many more too small to formally review or locate. In addition, there were 13 events to the west of Mauna Loa (<13 km deep), 17 shallow events on the upper southwest rift, 3 shallow events on the lower southwest rift, 3 shallow events on the NE rift zone.
Deformation: No changes in deformation rates or patterns were detected by the continuously recording GPS and tilt networks on Mauna Loa. Deformation continued to be dominated by southeasterly motion of the south flank. There was a discreet episode of about 1 cm of uplift at the two GPS stations nearest to the caldera between February 18 and 19. There does not appear to be any horizontal offset at that time. It's possible that the vertical signal may have been related to heavy snowfall that occurred around that time, though we have not observed such a clear offset from snowfall before.
Gas: No significant changes in SO2, CO2 were recorded by the Mokuaweoweo gas and temperature monitors during February. Fumarole temperature varied between 70 and 73 degrees C during the first half of the month until an equipment failure took the sensors offline; we are working to restore these data.
- 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