Earth and Planetary Science
EPS Near-Surface Geochemistry and Geobiology

Berkeley Earth Scientist Finds Separation of Scattering and Intrinsic Attenuation at Asama Volcanoa, Japan

Tuesday, March 14, 2017

Janire Prudencio is first author of “Separation of scattering and intrinsic attenuation at Asama volcano (Japan): Evidence of high volcanic structural contrasts.” The article came out on 18 January 2017 in the Journal of Volcanology and Geothermal Research.

In this study Prudencio and her co-authors show 2D intrinsic- and scattering-Q images of Asama volcano obtained by analyzing 2320 waveforms from active data. Observed energy envelopes were fitted to the diffusion model and separate intrinsic- and scattering-Q images were produced using a back-projection method based on a Gaussian-type weighting function. Synthetic tests indicate robustness and reliability of the results. Areas of high scattering attenuation coincide with the volcanic edifice and the summit at which recent eruptions took place. The intrinsic dissipation pattern shows a strong contrast between the east and west side of the volcanic structure with the low values observed in the west interpreted as solidified magma bodies. The researchers’ results demonstrate a strong relationship between structural heterogeneities and attenuation processes in volcanic areas and confirm the effectiveness of the present technique, which can be used as an imaging tool complementary to conventional techniques.

Janire Prudencio is a postdoctoral researcher working with Professor Michael Manga in the Berkeley Earth and Planetary Science Department.

For the full-length article please click here.