DOI: 10.1002/2014GL060306
论文题名: Magnitude -7 level earthquakes: A new lower limit of self-similarity in seismic scaling relationships
作者: Yoshimitsu N. ; Kawakata H. ; Takahashi N.
刊名: Geophysical Research Letters
ISSN: 0094-9976
EISSN: 1944-9707
出版年: 2014
卷: 41, 期: 13 起始页码: 4495
结束页码: 4502
语种: 英语
英文关键词: acoustic emission
; laboratory experiment
; scaling relationship
; source parameter
Scopus关键词: Acoustic emission testing
; Acoustic emissions
; Experiments
; Effective approaches
; Laboratory experiments
; Natural earthquake
; Pressure conditions
; Robust measurement
; Scaling relationships
; Self-similarities
; Source parameters
; Earthquakes
; acoustic emission
; earthquake magnitude
; laboratory method
; microearthquake
; microfacies
; seismic moment
; seismic source
; seismology
; source parameters
英文摘要: Microfractures occurring in a rock sample that are called acoustic emission (AE) events show some similar features to earthquakes. However, it remains to be shown whether or not AE equate to ultramicroearthquakes. In this study, we show the existence of magnitude -7 level earthquakes based on seismological analyses of AE source parameters. Advances in multichannel, broadband, high-speed continuous recording of AE under seismogenic pressure conditions has facilitated increasingly robust measurement. Source parameters of AE show that AE events satisfy the same scaling relationship as natural earthquakes in which seismic moment is inversely proportional to the cube of corner frequency. This result suggests that both millimeter scale fractures and natural earthquakes of kilometer scale ruptures are highly similar as physical processes. Hence, AE events can be interpreted as ultramicroearthquakes having a magnitude of about -7. These results demonstrate that laboratory observation is an effective approach in studying natural earthquake generation process. Key Points The magnitude -7 level earthquakes are identified in a laboratory experiment Ruptures from kilometer to millimeter scale satisfy the same self-similar relationship Broadband recording of AE events under a triaxial condition has been succeeded ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84937585882&doi=10.1002%2f2014GL060306&partnerID=40&md5=d34e466eba3ca4ff3dbd9a14d1b399e8
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7240
Appears in Collections: 气候减缓与适应
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作者单位: Center for Integrated Disaster Information Research, Earthquake Research Institute, University of Tokyo, Tokyo, Japan
Recommended Citation:
Yoshimitsu N.,Kawakata H.,Takahashi N.. Magnitude -7 level earthquakes: A new lower limit of self-similarity in seismic scaling relationships[J]. Geophysical Research Letters,2014-01-01,41(13).