Volcano Watch: The missing slow slip events on Kilauea’s south flank

Over the past two decades, both scientists and members of the public have anticipated the occurrence of slow slip events (SSEs) on Kilauea’s south flank. These events are recorded by the Hawaiian Volcano Observatory’s (HVO) continuous GPS network, which show as much as 2 cm (0.75 inches) of increased seaward motion of the flank over 2-3 days—equivalent to about a M6 earthquake.

Volcano Watch: Comparing crises — Mauna Loa 1984 vs. Mauna Loa 2022

Despite the development of new volcano monitoring techniques, decades between the eruptions meant there were many uncertainties leading to the recent eruption. Did the unrest observed during the fall of 2022 mean an eruption would certainly occur? How soon would modern monitoring signals show signs of an imminent eruption?

Legacy of lava

Hawaiian Volcano Observatory research geologist Frank Trusdell is considered an authority on Mauna Loa.