Deep Long‐Period Earthquakes at Akutan Volcano From 2005 to 2017 Better Track Magma Influxes Compared to Volcano‐Tectonic Earthquakes

Both volcano-tectonic (VTs) and deep long-period earthquakes (DLPs) have been documented at Akutan Volcano, Alaska may reflect different active processes helpful for eruption forecasting. In this study, we perform high-resolution earthquake detection, classification, relocation using seismic data from 2005 to 2017 investigate their relationship with underlying magmatic processes. We find that the 2,787 VTs 787 DLPs are concentrated above below inferred magma reservoir respectively. They both clustered as swarms occur preferentially during inflation episodes no spatial migrations. However, moment release rates of DLP show a stronger correlation low-frequency content is likely source instead path effect. Therefore, infer directly related unsteady movement through complex pathway. comparison, repeating events observed in VTs. Thus, conclude they represent fault rupture triggered by magma/fluid or larger earthquakes.