气候变化领域集成服务门户(CCPortal): Acoustic Energy Release During the Laboratory Seismic Cycle: Insights on Laboratory Earthquake Precursors and Prediction

CCPortal

DOI	10.1029/2019JB018975
	Acoustic Energy Release During the Laboratory Seismic Cycle: Insights on Laboratory Earthquake Precursors and Prediction
	Bolton D.C.; Shreedharan S.; Rivière J.; Marone C.
发表日期	2020
ISSN	21699313
卷号	125 期号:8
英文摘要	Machine learning can predict the timing and magnitude of laboratory earthquakes using statistics of acoustic emissions. The evolution of acoustic energy is critical for lab earthquake prediction; however, the connections between acoustic energy and fault zone processes leading to failure are poorly understood. Here, we document in detail the temporal evolution of acoustic energy during the laboratory seismic cycle. We report on friction experiments for a range of shearing velocities, normal stresses, and granular particle sizes. Acoustic emission data are recorded continuously throughout shear using broadband piezo-ceramic sensors. The coseismic acoustic energy release scales directly with stress drop and is consistent with concepts of frictional contact mechanics and time-dependent fault healing. Experiments conducted with larger grains (10.5 μm) show that the temporal evolution of acoustic energy scales directly with fault slip rate. In particular, the acoustic energy is low when the fault is locked and increases to a maximum during coseismic failure. Data from traditional slide-hold-slide friction tests confirm that acoustic energy release is closely linked to fault slip rate. Furthermore, variations in the true contact area of fault zone particles play a key role in the generation of acoustic energy. Our data show that acoustic radiation is related primarily to breaking/sliding of frictional contact junctions, which suggests that machine learning-based laboratory earthquake prediction derives from frictional weakening processes that begin very early in the seismic cycle and well before macroscopic failure. © 2020. The Authors.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187684
作者单位	Department of Geosciences, Pennsylvania State University, University Park, PA, United States; Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA, United States; Dipartimento di Scienze della Terra, La Sapienza Università di Roma, Rome, Italy
推荐引用方式 GB/T 7714	Bolton D.C.,Shreedharan S.,Rivière J.,et al. Acoustic Energy Release During the Laboratory Seismic Cycle: Insights on Laboratory Earthquake Precursors and Prediction[J],2020,125(8).
APA	Bolton D.C.,Shreedharan S.,Rivière J.,&Marone C..(2020).Acoustic Energy Release During the Laboratory Seismic Cycle: Insights on Laboratory Earthquake Precursors and Prediction.Journal of Geophysical Research: Solid Earth,125(8).
MLA	Bolton D.C.,et al."Acoustic Energy Release During the Laboratory Seismic Cycle: Insights on Laboratory Earthquake Precursors and Prediction".Journal of Geophysical Research: Solid Earth 125.8(2020).