Journal
GEOPHYSICAL JOURNAL INTERNATIONAL
Volume 185, Issue 3, Pages 1384-1392Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-246X.2011.05015.x
Keywords
Time series analysis; Coda waves; Theoretical seismology; Wave scattering and diffraction; Rheology: crusts and lithosphere
Categories
Funding
- ANR [JCJC08]
- ERC
Ask authors/readers for more resources
P>Long duration noisy-looking waveforms such as those obtained in randomly multiple scattering and reverberant media are complex; they resist direct interpretation. Nevertheless, such waveforms are sensitive to small changes in the source of the waves or in the medium in which they propagate. Monitoring such waveforms, whether obtained directly or obtained indirectly by noise correlation, is emerging as a technique for detecting changes in media. Interpretation of changes is in principle problematic; it is not always clear whether a change is due to sources or to the medium. Of particular interest is the detection of small changes in propagation speeds. An expression is derived here for the apparent, but illusory, waveform dilation due to a change of source. The expression permits changes in waveforms due to changes in wave speed to be distinguished with high precision from changes due to other reasons. The theory is successfully compared with analysis of a laboratory ultrasonic data set and a seismic data set from Parkfield California.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available