Observations of premonitory acoustic emission and slip nucleation during a stick slip experiment in smooth faulted Westerly granite

Details Observations of premonitory acoustic emission and slip nucleation during a stick slip experiment in smooth faulted Westerly granite Observations of premonitory acoustic emission and slip nucleation during a stick slip experiment in smooth faulted Westerly granite

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3210304t&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 10, CiteID L10304

Physics

11

Physical Properties Of Rocks: Fracture And Flow, Seismology: Earthquake Dynamics (1242), Seismology: Earthquake Source Observations (1240), Physical Properties Of Rocks: Acoustic Properties

Scientific paper

To investigate laboratory earthquakes, stick-slip events were induced on a saw-cut Westerly granite sample by triaxial loading at 150 MPa confining pressure. Acoustic emissions (AE) were monitored using an innovative continuous waveform recorder. The first motion of each stick slip was recorded as a large-amplitude AE signal. These events source locate onto the saw-cut fault plane, implying that they represent the nucleation sites of the dynamic failure stick-slip events. The precise location of nucleation varied between events and was probably controlled by heterogeneity of stress or surface conditions on the fault. The initial nucleation diameter of each dynamic instability was inferred to be less than 3 mm. A small number of AE were recorded prior to each macro slip event. For the second and third slip events, premonitory AE source mechanisms mimic the large scale fault plane geometry.

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