Frictional sliding in serpentine at very high pressure |
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| Authors: | Haemyeong Jung Yingwei Fei Paul G Silver Harry W Green |
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| Institution: | 1. Department of Physics, University of Agriculture, PMB 2240, Abeokuta, Nigeria;2. Karakalpak State Pedagogical Institute, Nukus, Uzbekistan;3. Karakalpak State University, Nukus, Uzbekistan;4. Department of Physics, Federal University of Technology, Owerri, Nigeria;1. Universidad Nacional de Colombia, Medellín Campus, Colombia;2. University of Southern California, United States;3. Federal University of Rio Grande do Norte, Brazil;1. Universität Bonn, Steinmann-Institut, Poppelsdorfer Schloss, D-53115 Bonn, Germany;2. Georg-August-Universität, Geowissenschaftliches Zentrum, Abteilung Isotopengeologie, Goldschmidtstraße 1, D-37073 Göttingen, Germany;3. Steinmann-Institut, Universität Bonn, Poppelsdorfer Schloss, D-53115 Bonn, Germany;4. Universitat Köln, Geowissenschaften, Geo-/Kosmochemie, Greinstr. 4-6, Gebäude 902, D-50939 Köln, Germany;5. Karl-Franzens Universität Graz, Institut für Erdwissenschaften, Heinrichstraße 26, A- 8010 Graz, Austria |
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| Abstract: | Using a new four-channel system for detecting acoustic emissions in a multianvil apparatus, we have assessed the pressure–temperature range for such emissions, as well as the role of dehydration, by deforming samples of extensively serpentinized peridotite. We show that in the absence of dehydration and for samples initially faulted at low pressure, acoustic emissions occurred well outside the expected pressure–temperature field of unassisted brittle failure. Emissions were also detected during and after dehydration of serpentine. Microstructures of post-run specimens revealed fault slip with offsets up to ~ 500 μm, regardless of whether or not dehydration took place. Dehydration appears to effectively stop slip on pre-existing faults and create new ones. Analysis of P-wave travel times from the four sensors confirmed that the acoustic emissions originated within the specimen during fault slip. These observations suggest that earthquakes can be triggered by slip along an existing fault containing serpentine under significantly higher pressure and temperature conditions than previously thought possible without dehydration. |
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