← Back to Sessions

The Influence of Multiple Scattered Waves on the Spectral Stability of Volcanic Tremors

Description: 

The conventional understanding of the stability observed in the spectral content of volcanic tremors attributes it primarily to the consistency of the source mechanism generating these signals. In our study, we perform a more detailed examination of the origin of seismo-volcanic signals through numerical simulations utilizing spectral elements methods. Our findings reveal that the stable features observed in the signal spectrum can be produced by interference of multiply scattered waves on strong structural heterogeneity within the volcano plumbing system, arising from a complex distribution of magmatic sills and dikes. To simulate the plumbing system's heterogeneity, we used a model of its growth by multiple injections of magma into surrounding crustal rocks (Melnik 2022). By computing the propagation of waves in this medium over extended durations, we show that the highly heterogeneous structure results in a strong multiple scattering of seismic waves whose interference creates a distinctive signature in the signal spectra. This phenomenon holds true even when considering a source spectrum that exhibits randomness. Our results provide valuable insights into the heterogeneous structure of volcano plumbing systems that is expressed in the observed complexity and stability of the spectra of the seismo-volcanic signals. This study broadens our comprehension of volcanic processes and emphasizes the significance of multiple scattering of seismic waves within volcanic media.

Session: Seismoacoustic, Geodetic and Other Geophysical Investigations of Active Volcanoes - I

Type: Oral

Date: 5/3/2024

Presentation Time: 09:00 AM (local time)

Presenting Author: Mirko

Student Presenter: Yes

Invited Presentation: 

Authors