EGU25-15322, updated on 15 Mar 2025
https://doi.org/10.5194/egusphere-egu25-15322
EGU General Assembly 2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Ambient noise interferometry as a tool for volcanic system monitoring: insights from the 2024 Kīlauea East Rift Zone eruption 
Alicia Rohnacher and Federica Lanza
Alicia Rohnacher and Federica Lanza
  • Swiss Seismological Service, ETH Zürich, Switzerland

Ambient noise interferometry has emerged as a powerful technique for tracking changes in volcanic systems by providing continuous data on seismic velocity variations (dv/v). Due to its sensitivity to structural variations (e.g., crack opening or closing), magma intrusions, and external factors like precipitation, this method offers valuable insights into dynamic volcanic processes. Here, we use ambient noise interferometry to study the September 2024 East Rift Zone (ERZ) eruption of Kīlauea volcano. This eruption and the preceding intrusions were captured by a dense nodal seismic network of 116 stations distributed over an area of 30×60 km in the ERZ. With this new dataset we investigate magma-tectonic interactions by monitoring seismic velocity variations (dv/v) across space and time. These variations, driven by both internal factors (magmatic and tectonic activity) and external forces (e.g. precipitation), were contextualized using complementary geophysical observations, including data from tiltmeters, GPS stations, and precipitation sensors maintained by the Hawaiian Volcano Observatory. Initial results revealed a velocity decrease of up to 1% during the July 2024 intrusion event, correlating with increased seismicity and deformation observed at the summit and in the Middle East Rift Zone. This study highlights how the integration of various geophysical observations can improve the understanding of volcanic precursors and magma dynamics and demonstrates the potential of dense seismic networks for volcano monitoring. 

How to cite: Rohnacher, A. and Lanza, F.: Ambient noise interferometry as a tool for volcanic system monitoring: insights from the 2024 Kīlauea East Rift Zone eruption , EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-15322, https://doi.org/10.5194/egusphere-egu25-15322, 2025.

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