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Receiver Function Imaging of Erebus Volcano via Joint Bayesian Inversion With Spatial Weighting

Description: 

Erebus volcano, located on Ross Island, Antarctica, is one of few examples of an open convecting lava lake. It features Strombolian style eruptions among various forms of ambient seismicity and has a complex magmatic structure with sparsely resolved continuity between the crust and mantle related to a hypothesized hot spot upwelling. Previous active source tomography and coda interferometry studies have noted strong shallow scattering structures associated with low velocities, but the Moho depth has only been regionally constrained to an estimated 18 - 20 km depth. To better resolve this and corroborate other large-scale crustal structures, we use twenty-seven seismic stations distributed on the Erebus edifice from the Tomo-Erebus, MEVO, and GSN seismic networks with a total of two hundred and eleven earthquakes between 2007 - 2010 to compute P-wave receiver functions (PRFs) with individual and multi-station Bayesian Markov chain Monte Carlo (MCMC) inversions. By using multi-station inversions, we assume the deeper structures are similar across stations but have greater variance closer to the surface to account for edifice heterogeneity. After inverting, we note a strong shallow discontinuity between 4 - 7 km, corroborated by ongoing icequake coda images, and a Moho depth between 17 - 22 km. Dispersion information is planned as part of an eventual joint inversion for the entire dataset.

Session: Crustal Imaging of High Seismic Hazard Regions [Poster]

Type: Poster

Date: 4/20/2023

Presentation Time: 08:00 AM (local time)

Presenting Author: Rachelle Reisinger

Student Presenter: Yes

Invited Presentation: 

Authors