Evidence for fluid-assisted shear failure in a ductile shear zone: tectonic tremor in the geologic record?
Recent direct observations of tectonic tremor below the seismogenic zone of large fault zones have emphasized the significance of coeval ductile and brittle processes at high temperatures. Tectonic tremor is defined as long-duration, low-amplitude, and low-frequency seismic signals produced at depths of 18-40 km. Because the source of tremor is currently unknown, the physical conditions and processes that cause tremor are unknown. This study presents observations of an exhumed shear zone system contained within the Saddlebag Lake pendant of the eastern Sierra Nevada, California. The high-strain ...
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