A closer view of a gravity reading at a station located in the south part of K&#

A closer view of a gravity reading at a station located in the south part of Kīlauea caldera. When repeated over time, gravity measurements can detect changes in subsurface mass that might not be detectable by other monitoring methods. Scientists track this data because the changes could be related to magma movement within the volcano. USGS photo by M. Poland, 03/20/2019.