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A Passive Estimation Method of Scattering and Intrinsic Absorption Parameters From Envelopes of Seismic Ambient Noise Cross‐Correlation Functions
Author(s) -
Hirose Takashi,
Nakahara Hisashi,
Nishimura Takeshi
Publication year - 2019
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2018gl080553
Subject(s) - scattering , rayleigh scattering , ambient noise level , absorption (acoustics) , computational physics , physics , noise (video) , cross correlation , flattening , radiative transfer , raman scattering , optics , geology , acoustics , raman spectroscopy , sound (geography) , mathematics , mathematical analysis , astronomy , artificial intelligence , computer science , image (mathematics)
We present a passive method to estimate the scattering and intrinsic absorption parameters of Rayleigh waves. Envelopes of seismic ambient noise cross‐correlation functions are calculated using the temporal flattening technique, and these parameters are estimated by modeling their space‐time distributions using radiative transfer theory. The scattering mean free paths are estimated to be 1.6–2.4 km at 0.5–1 Hz, 1.6–2.0 km at 1–2 Hz, and 1.6–3.2 km at 2–4 Hz at the Sakurajima volcano, Japan. Intrinsic absorption parameters are 0.04–0.06 s −1 at 0.5–1 Hz, 0.08–0.09 s −1 at 1–2 Hz, and 0.16–0.18 s −1 at 2–4 Hz. We validate these values by conducting a comparative study using active shot records at Sakurajima. Our passive method provides an effective way to measure scattering and intrinsic absorption parameters in various regions.