HAWAIIAN VOLCANO OBSERVATORY BIWEEKLY UPDATE
Monday, February 1, 2010 3:04 PM HST (Tuesday, February 2, 2010 01:04 UTC)

Report prepared by the Hawaiian Volcano Observatory:

MAUNA LOA VOLCANO (CAVW #1302-02=)
1928'30" N 15536'29" W, Summit Elevation 13681 ft (4170 m)
Current Aviation Color Code: YELLOW
Current Volcano Alert Level: ADVISORY

Mauna Loa is not erupting. There has been no significant change in line length across the summit or the flanks of Mauna Loa as measured by GPS receivers on opposite sides of the volcano.

Tiltmeters have recorded no significant changes other than abrupt offsets that are related to instrumental issues, severe weather, or significant earthquakes.

Sensors within a fissure in Moku`aweoweo crater floor reported gas concentrations within normal values; fumarole temperatures continued to slowly decrease.

Since the beginning of January, 2005, HVO analysts have rarely located more than 10 earthquakes per week beneath Mauna Loa summit and 1-5 earthquakes beneath the Kealakekua area of west Mauna Loa. The Kao`iki seismic zone between Mauna Loa and Kilauea volcano summits remained active with an average of about 10-40 earthquakes per week and included a magnitude-3.0 quake which occurred at 2:37 pm on January 25; these numbers may reflect increased seismic activity nearer Kilauea summit rather than increased Ka`oiki activity.

The Hawaiian Volcano Observatory is one of five volcano observatories within the U.S. Geological Survey and is responsible for monitoring volcanoes and earthquakes in Hawai`i.