System for detecting acoustic emissions in multianvil experiments: Application to deep seismicity in the Earth
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- Haemyeong Jung
- University of California, Riverside Institute of Geophysics and Planetary Physics, , California 92521; Geophysical Laboratory, , Washington, DC 20015 and Department of Terrestrial Magnetism, , Washington, DC 20015
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- Yingwei Fei
- Carnegie Institute of Washington Geophysical Laboratory, , Washington, DC 20015
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- Paul G. Silver
- Carnegie Institute of Washington Department of Terrestrial Magnetism, , Washington, DC 20015
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- Harry W. Green
- University of California Institute of Geophysics and Planetary Physics, , Riverside, California 92521 and Department of Earth Sciences, , California 92521
書誌事項
- 公開日
- 2006-01-01
- DOI
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- 10.1063/1.2148994
- 公開者
- AIP Publishing
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説明
<jats:p>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.</jats:p>
収録刊行物
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- Review of Scientific Instruments
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Review of Scientific Instruments 77 (1), 7-, 2006-01-01
AIP Publishing
