Ambient noise interferometry on the Island of Hawai'i
The Island of Hawai'i, consisting of five volcanoes, is one of the best places to understand the structure and evolution of shield volcanoes. I'm very interested in using the ambient noise interferometry as tool to explore and monitor the underground strcures and temporal variations under the volcanic active Island of Hawai'i.
Although the ambient noise interferometry has been well used globally to understand the underground structure and the medium temporal variation, it is no easy task to carry it out on the Island of Hawai'i. The last standing volcanic tremor source at the Kīlauea summit has been putting noise in the ambient noise field and thus containminating the resulted emprical Green's Functions.
The cross-correlation result have better signal-noise-ratio after the eruption, where even multiple P wave signals can be observed. The new emerged P wave arrivals, reflected off two middle crustal interfaces, provide additional constraints for the velocity structures under the Island of Hawai'i.
