IGPP is pleased to invite you to join its Fall 2021 Seminar Series presentation featuring Australian National University's Voon Hui Lai. Dr. Shirzaei's talk, "Inflation and Asymmetric Collapse at Kīlauea Summit during the 2018 Eruption from Seismic and Infrasound Analyses" will be available via Zoom on Tuesday, November 16, 2021, starting at 12:00pm. Zoom: https://ucsd.zoom.us/j/97463891573?pwd=amRrMytaMGRBbjRYQWRaYXlvdDJhZz09. Password: hawaii
Date: Tuesday, November 16, 2021
Time: 12:00 pm, Pacific Time
Note: This meeting will be recorded. Please make sure that you are comfortable with this before registering.
Abstract: Characterizing the large M4.7+ seismic events during the 2018 Kīlauea eruption is crucial to understanding the complex subsurface deformation beneath the Kīlauea summit and its relation to the overall eruption sequence. However, resolving the source location and mechanism is challenging due to several reasons, including (1) long period far-field seismic waves are insensitive to non double-couple components at shallow source depths and (2) clipping of near-field seismic recordings. In this talk, I will demonstrate how a diverse geophysical data sets and techniques including particle motion analysis, local and teleseismic seismic moment tensor analysis, infrasound travel time study, and infrasound simulations can provide constraints on source depth, source location, volumetric contribution, and faulting geometry. The analyses reveal that the summit events are characterized by both inflation of the shallow Halema'uma'u reservoir and asymmetric slip on inward-dipping normal faults along the northwest corner of the caldera.