Raw seismic data from Kīlauea summit stations—December 20, 2021

Ninety seconds of raw seismic data from four seismic stations around Kīlauea summit. Dates and times, at the bottom of the graph, are in Coordinated Universal Time (UTC). The stations captured two types of seismic signals we typically observe in volcanic settings: (left) a typical tectonic earthquake signal, which results from rocks breaking free and sliding against each other; and (right) a magma-related earthquake signal, which typically results from reverberation of magma. The difference in the frequency of the vibration is starkly noticeable as the magma-related signals (right) have wider-spaced peaks and troughs when compared to the tectonic earthquake signals (left).