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Receiver Function Inversion at Erebus Volcano, Antarctica, With Multi-Station Weighting

Description: 

Erebus volcano, located on Ross Island, Antarctica, has an open convecting lava lake with Strombolian style eruptions. The volcano features a complex magmatic structure that is related to a hypothesized hot spot upwelling despite a lack of conclusive local crustal studies. Previous active source tomography and coda interferometry studies have noted strong shallow scattering structures associated with low velocities in the upper edifice, 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 over two hundred earthquakes between 2007 - 2010 to compute P-wave receiver functions (PRFs). These are supplemented by icequake and ambient noise derived surface wave dispersion curves, resulting in a joint Bayesian Markov chain Monte Carlo (MCMC) inversion for spatially weighted sub-arrays of the network. 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 1 - 5 km, corroborated by ongoing scattering images, and a general Moho depth between 18 - 22 km.

Session: Earth’s Structure from the Crust to the Core [Poster Session]

Type: Poster

Date: 5/2/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Rachelle

Student Presenter: Yes

Invited Presentation: 

Authors