Kīlauea activity late August 23 to 26

Top panel shows tiltmeter data from the Sandhill (SDH) instrument, located within Kīlauea’s south caldera region. The line indicates that the instrument tilted towards an azimuth of 300° (northwest) as the ground in the area inflated.  Occasional spikes are due to sloshing of instrument’s bubble level during earthquakes. Bottom panel is an hourly histogram of earthquakes in Kīlauea’s summit region.  Both show the increase in activity late Monday, August 23, and subsequent slowdown the following Wednesday. USGS plots.