Spatiotemporal Variations of Focal Mechanism and In Situ Vp/Vs Ratio During the 2018 Kīlauea Eruption

Guoqing Lin, Peter M. Shearer

Research output: Contribution to journalArticlepeer-review


We examine the spatiotemporal variations in seismic parameters corresponding to the 2018 Kīlauea eruption. We find that the summit area had mainly strike-slip focal solutions prior to the eruption, whereas normal-faulting was the predominant feature during the eruption, partially due to the collapse events. In contrast, the majority of the earthquakes in the central south flank had normal-faulting solutions before December 2017, in agreement with the normal-faulting of the Hilina Fault System, while there are more reverse solutions during the eruption. We also observe temporal variations in the estimated in situ (Formula presented.) ratios corresponding to the eruption, with increases in the summit and decreases in the East Rift Zone. The sustained low (Formula presented.) ratios below 4 km depth under the summit caldera may suggest persistent ascent of volatiles from the mantle. The low (Formula presented.) values in the East Rift Zone are probably associated with increased degassing.

Original languageEnglish (US)
Article numbere2021GL094636
JournalGeophysical Research Letters
Issue number18
StatePublished - Sep 28 2021

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)


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