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Contact: Paul Preuss
paul_preuss@lbl.gov
510-486-6249
DOE/Lawrence Berkeley National Laboratory
Caption: Time delay of seismic waves was normally correlated with changes in stress due to barometric pressure (above). Two seismic events, one of magnitude 3 and another of magnitude 1, caused excursions from this relationship. The excursions were detected before the events occurred (arrows), possibly because of preseismic changes in the crack structure of the rock.
Credit: Niu et al
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Related news release: A stress meter for fault zones
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