Journal
GEOLOGY
Volume 41, Issue 11, Pages 1175-1178Publisher
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G34641.1
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Funding
- European Research Council Starting Grant Project (USEMS) [205175]
- European Research Council (ERC) [205175] Funding Source: European Research Council (ERC)
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Earthquakes occur along faults in response to plate tectonic movements, but paradoxically, are not widely recognized in the geological record, severely limiting our knowledge of earthquake physics and hampering accurate assessments of seismic hazard. Light-reflective (so-called mirror like) fault surfaces are widely observed geological features, especially in carbonate-bearing rocks of the shallow crust. Here we report on the occurrence of mirrorlike fault surfaces cutting dolostone gouges in the Italian Alps. Using friction experiments, we demonstrate that the mirror-like surfaces develop only at seismic slip rates (similar to 1 m/s) and for applied normal stresses and sliding displacements consistent with those estimated on the natural faults. Under these experimental conditions, the frictional power density dissipated in the samples is comparable to that estimated for natural earthquakes (1-10 MW/m(2)). Our results indicate that mirror-like surfaces in dolostone gouges are a signature of seismic faulting, and can be used to estimate power dissipation during ancient earthquake ruptures.
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