Mouna Loa Update for 9/1/07

Current Mouna Loa status from HVO:

Mauna Loa Biweekly Update issued Sep 1, 2007 08:40 HST Volcanic-Alert Level ADVISORY – Aviation Color Code YELLOW
Report prepared by the Hawaiian Volcano Observatory:

Mauna Loa is not erupting. There have been no significant changes.

Our network of continuous GPS receivers showed a remarkably uniform rate of inflation over the past 6 months, recording 1 cm of extension across the caldera and nearly 2 cm of extension across the flanks in that time.

Tiltmeters have recorded no significant changes. One of the tiltmeters on the southwest rift zone was repaired in the past week.

An annual survey of gravity values around the summit area was also completed this past week.

Mauna Loa remains seismically quiet with few earthquakes occurring beneath the summit or the Ka`oiki seismic zone on the east flank. Since the beginning of January, 2005, HVO analysts have rarely located more than 10 earthquakes per week beneath Mauna Loa summit.

A magnitude-4.1 earthquake occurred on August 16, 2007 at 3:02 am HST and was located 5.4 km (3.4 miles) east of Kulani Cone, in the lower east rift zone, at a depth of 25 km (16 miles). Several aftershocks were located in the same area.

Temperatures and gas concentrations on the summit crater floor remain at background levels.

Mauna Loa

Current Biweekly status:

Mauna Loa Biweekly Update issued Jul 10, 2007 14:05 HST Volcanic-Alert Level ADVISORY – Aviation Color Code YELLOW
Report by Hawaiian Volcano Observatory for 10 July, 2007:

Mauna Loa is not erupting. There have been no significant changes.

GPS data suggest that, starting in early September 2005, inflation of the volcano has slowed. Over the past 6 months, our GPS network has recorded nearly 1 cm of extension across the caldera and 2 cm of extension across the flanks. Slow extension continues.

Tiltmeters have recorded no significant changes.

Mauna Loa remains seismically quiet with few earthquakes occurring beneath the summit or the Ka`oiki seismic zone on the east flank. Since the beginning of January, 2005, HVO analysts have rarely located more than 10 earthquakes per week beneath Mauna Loa summit.

Temperatures and gas concentrations on the summit crater floor remain at background levels. The webcam has shown nothing unusual; typical warm spots on the crater floor produce steam in the early morning and late afternoon.

HVO