Annual Mauna Loa GPS Survey—2021

GPS survey benchmark being occupied on Mauna Loa's north flank

Detailed Description

Another GPS survey benchmark being occupied on Mauna Loa's north flank, with clear views of Mauna Kea in the background. The metal disk on the ground beneath the tripod is the benchmark, which is cemented to the lava flow surface. Each year, the high-precision GPS unit is centered on the benchmark, and the height of the GPS unit on the tripod is accounted for when calculating how much that spot has moved vertically and horizontally over the past year. USGS photo by S. Conway.

Details

Image Dimensions: 4032 x 3024

Date Taken:

Location Taken: US