BAND-LIMITED HETEROGENEOUS FRACTAL STRUCTURE OF EARTHQUAKES AND ACOUSTIC EMISSION EVENTS

概要

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Generalized correlation integral functions of the spatial distribution of earthquake epicenters have been determined for the Chinese earthquake catalogue. These correlation integral functions have three distinct power law regimes (bands), showing that the spatial distribution of earthquakes has band-limited heterogeneous fractal structure. We also found similar results in the hypocenter distribution of acoustic emission events in coarse-grained granite under triaxial compression test. These results show that the fractal structure in rock fracturing process is very complex : they are heterogeneous in space and also band-limited in scale. The spatial distribution of fractures show different patterns corresponding to different scale ranges : microcracks in rock samples, earthquake epicenters in seismic cluster, seismic clusters along active fault zone (boundary of crustal block, for the most cases), and active fault zones in the earth's crust. The fractal dimension differs corresponding to the scale bands indicating that there are some intrinsic characteristic scales existed in the fracturing system, such as grain size and size of crustal blocks.
独立行政法人防災科学技術研究所の論文
1993-03-29