Three-dimensional location and waveform analysis of microseismicity in multi-anvil experiments

Details Three-dimensional location and waveform analysis of microseismicity in multi-anvil experiments Three-dimensional location and waveform analysis of microseismicity in multi-anvil experiments

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007geoji.171.1282d&link_type=abstract

Geophysical Journal International, Volume 171, Issue 5597, pp. 1282-1294.

Astronomy and Astrophysics

Astronomy

3

Deep Focus Earthquake, Deformation, Hypocentre, Laboratory Measurement, Microseismicity, Waveform Analysis

Scientific paper

We present an acoustic emission (AE) monitoring technique to study high-pressure (P > 1 GPa) microseismicity in multi-anvil rock deformation experiments. The application of this technique is aimed at studying fault mechanisms of deep-focus earthquakes that occur during subduction at depths up to 650 km. AE monitoring in multi-anvil experiments is challenging because source locations need to be resolved to a submillimetre scale due to the small size of the experimental assembly. AEs were collected using an 8-receiver array, located on the back truncations of the tungsten carbide anvils. Each receiver consists of a 150-1000 kHz bandwidth PZT transducer assembly. Data were recorded and processed using a high-speed AMSY-5 acquisition system from Vallen-Systems, allowing waveform collection at a 10 MHz sampling rate for each event signal. 3-D hypocentre locations in the assembly are calculated using standard seismological algorithms. The technique was used to monitor fault development in 3 mm long × 1.5 mm diameter olivine cores during axisymmetric compression and extension. The faults were generated during cold compression to ~2 GPa confining pressure. Subsequent AEs at 2-6 GPa and 900 °C were found to locate near these pre-existing faults and exhibit high pressure stick-slip behaviour.

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