Increasing magma pressure most likely culprit in triggering the 2018 Kīlaue

Plot of ground motion as recorded by a GPS station at Kīlauea's summit (red) and the Pu‘u ‘Ō‘ō vent (blue) for the 8 months leading up to the 2018 eruption. Note the sharp increase indicating pressurization beginning in March. Image shows an aerial view of Halema‘uma‘u crater and the actively overflowing lava lake on April 23, 2018. USGS Photo.