Physics – Geophysics
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3321302s&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 21, CiteID L21302
Physics
Geophysics
51
Exploration Geophysics: Seismic Methods (3025, 7294), Hydrology: Groundwater Hydrology, Seismology: Theory, Seismology: Volcano Seismology (8419), Volcanology: Volcano Monitoring (7280)
Scientific paper
We propose passive image interferometry as a technique for seismology that allows to continuously monitor small temporal changes of seismic velocities in the subsurface. The technique is independent of sources in the classical sense and requires just one or two permanent seismic stations. We retrieve the Green's functions that we use for interferometry from ambient seismic noise. Applying passive image interferometry to data from Merapi volcano we show that velocity variations can be measured with an accuracy of 0.1% with a temporal resolution of a single day. At Mt. Merapi the velocity variations show a strong seasonal influence and we present a depth dependent hydrological model that describes our observations solely based on precipitation.
Sens-Schönfelder Christoph
Wegler Ulrich
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