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Temporal variation of multifractal properties of seismicity in the region affected by the mainshock of the October 6, 2000 Western Tottori Prefecture, Japan, earthquake ( M = 7.3)
Author(s) -
Nakaya Shinji,
Hashimoto Takeshi
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2001gl014216
Subject(s) - aftershock , multifractal system , seismology , induced seismicity , geology , foreshock , shock (circulatory) , tectonics , spatial distribution , sequence (biology) , fractal , mathematics , medicine , mathematical analysis , remote sensing , biology , genetics
The temporal variation of multifractal properties in spatial distribution of seismicity in the region affected by the main shock of the Western Tottori Prefecture, Japan, earthquake of October 6, 2000 ( M = 7.3) and its aftershock sequence are investigated. We use earthquake catalog data from 1985 to 2001 in order to understand the process and mechanism preceding a large, shallow earthquake. A monotonous decrease of multifractal dimension D q with a wide range of q appeared clearly for about two years prior to this large, shallow earthquake; D q then increased to a maximum at the time of the main shock. During the aftershock sequence, D q oscillated between 2.0 and 0.7. The decrease and then increase of D q with respect to the spatial distribution of seismic events indicate clustering and declustering in multifractal structure, respectively. The temporal variation of D q reflects the accumulation and release of strain energy within the tectonic stress field.