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The 2018 rift zone eruption of K\={\i}lauea volcano was accompanied by aremarkable and episodic collapse of its summit. Between May-August the eruptionand collapse sequence included over 70,000 earthquakes (M$\geq$0) and 54 majorearthquakes (M$\geq$5). We analyzed the seismicity in the K\={\i}lauea summitregion and estimated seismic full moment tensors with their uncertainties forthe 54 M$\geq$5 events. These events occurred at almost daily intervals andwere accompanied by intense seismicity which was concentrated between 0-3 kmdepths beneath the Halema`uma`u pit crater. The hypocenters reveal partialelliptical patterns (map view) that migrated downward by $\sim$200 m. Themoment tensors reveal remarkably consistent mechanisms, with negative isotropicsource types and localized uncertainties, and vertical P-axis orientations.From the moment tensors we derived Poisson's ratios which are variable($\nu=0.1-0.3)$ for the first half of the collapse events and converged to$\nu\sim0.28$ from June 26 onward.

Negative isotropic seismic moment tensors, migrating and cyclic seismicity during the 2018 summit collapse at K\={\i}lauea caldera