Passive image interferometry and seasonal variations of seismic velocities at Merapi Volcano, Indonesia

Geophysical Research Letters - Tập 33 Số 21 - 2006
Christoph Sens‐Schönfelder1, Ulrich Wegler1
1Department of Geophysics and Geology University of Leipzig Leipzig Germany

Tóm tắt

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.

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Tài liệu tham khảo

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Geophysical Research Letters

Tập 33 Số 21

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