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Review of Scientific Instruments / Volume 77 / Issue 1 / GRAVITY; GEOPHYSICS; ASTRONOMY AND ASTROPHYSICS

Rev. Sci. Instrum. 77, 014501 (2006); http://dx.doi.org/10.1063/1.2148994 (7 pages)

System for detecting acoustic emissions in multianvil experiments: Application to deep seismicity in the Earth

Haemyeong Jung1, Yingwei Fei2, Paul G. Silver3, and Harry W. Green4

1Institute of Geophysics and Planetary Physics, University of California, Riverside, California 92521; Geophysical Laboratory, Carnegie Institute of Washington, Washington, DC 20015 and Department of Terrestrial Magnetism, Carnegie Institute of Washington, Washington, DC 20015
2Geophysical Laboratory, Carnegie Institute of Washington, Washington, DC 20015
3Department of Terrestrial Magnetism, Carnegie Institute of Washington, Washington, DC 20015
4Institute of Geophysics and Planetary Physics, University of California, Riverside, California 92521 and Department of Earth Sciences, University of California, Riverside, California 92521

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(Received 15 June 2005; accepted 3 November 2005; published online 12 January 2006)

One of the major goals in the experimental study of deep earthquakes is to identify slip instabilities at high pressure and high temperature (HPHT) that might be responsible for the occurrence of earthquakes. Detecting acoustic emissions from a specimen during faulting provides unique constraints on the instability process. There are few experimental studies reporting acoustic emissions under HPHT conditions, due to technical challenges. And those studies have used only one or at most two acoustic sensors during the experiments. Such techniques preclude the accurate location of the acoustic emission source region and thus the ability to distinguish real signal from noise that may be coming from outside the sample. We have developed a system for detecting acoustic emissions at HPHT. Here we present a four-channel acoustic emission detecting system working in the HPHT octahedral multianvil apparatus. Each channel has high resolution (12 bits) and a sampling rate of 30 MHz. In experiments at the pressures up to 6 GPa and temperatures up to 770 °C, we have observed acoustic emissions under various conditions. Analyzing these signals, we are able to show that this system permits us to distinguish between signal and noise, locate the source of the acoustic emission, and obtain reliable data on the radiation pattern. This system has greatly improved our ability to study faulting instabilities under high pressure and high temperature.

© 2006 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL SYSTEM
    1. Apparatus and acoustic sensor positions
    2. Acoustic sensors (transducers) and data collecting system
    3. Sample assembly
  3. HIGH-PRESSURE FAULTING EXPERIMENTS
    1. Specimen
    2. Experimental procedures
    3. Detecting acoustic emissions from the carbide experiments
    4. Detecting acoustic emissions in serpentinite experiments
  4. DISCUSSION

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KEYWORDS and PACS

Keywords

geophysical techniques, acoustic emission, faulting, earthquakes, geophysical equipment

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2148994

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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