Seismicity at Mauna Loa remains elevated in several parts of the volcano, however activity has been lower than in previous months. Earthquake rates on the upper Southwest Rift Zone (Sulfur Cone) and Moku’aweoweo Crater remain elevated, with nearly 100 located earthquakes occurring in June. Though there were no swarms on the west flank of Mauna Loa, earthquake rates remained above background with approximately 17 earthquakes occurring in June. All earthquakes in the past month have been small relative to earthquake sequences observed before eruptions in 1975 and 1984.
The Mauna Loa GPS network recorded a resumption of inflation during early to mid June, after an approximately month-long lull. It is too early to establish the exact rate and pattern of inflation, but so far, the predominant average motions during June are similar to average motions since this current episode of inflation started in the summer of 2014. Preliminary modeling of the long-term pattern suggests at least two inflating reservoirs–a spherical reservoir near the southeast wall of the summit caldera, and a tabular body that lies beneath the caldera and upper Southwest Rift Zone.
No significant changes in SO2 and CO2 were recorded by the continuous fumaroles monitor during June, 2015. The fumarole temperature sensor continued to record a decline that began on 08 May. Since that time, the temperature as decreased from 82 to about 79 degrees by the end of June.
July 20, 2015. Mauna Loa , Hawai :
19 ° 28’30 « N 155 ° 36’29 » W,
Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN
Source : HVO.
Photos : HVO