September 17, 2024 — Annual Kīlauea GPS campaign underway
Detailed Description
A benchmark on Kīlauea being surveyed by GPS campaign instruments. The metal disk on the ground beneath the tripod is the benchmark, which is cemented to the lava flow surface. During annual GPS surveys, measurements are made on the benchmarks to allow for comparisons to previous surveys. USGS photo by A. Ellis.
Sources/Usage
Public Domain.