Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 41, Issue 13, Pages 4495-4502Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL060306
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Funding
- Japan Society for the Promotion of Science
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
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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 inmultichannel, 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.
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