Characterization of crustal structures by fractal analysis of gravity anomalies

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概要

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• The applicability of the fractal analysis of gravity anomaly to the study of the crustal structure is investigated. Gravity anomaly data in three square areas (175km×175km) in the Japanese Islands with different tectonic settings are analyzed. To study the self-similarity of the gravity anomaly, we adopt the box-counting method to individual contour lines of the gravity anomaly. The contour lines of the gravity anomaly are confirmed to exhibit fractal geometry. The estimated fractal dimensions are in a range of 1.3-1, varying as a function of the gravity anomaly. In order to infer the crustal characteristics we further analyze the relation between the gravity anomaly and the fractal dimension for each area. The observed relations for the three areas are different from each other, reflecting their distinctive crustal structures. The relations can be explained by the lateral variation of depths and the topographic complexity of the subsurface density boundaries.

• 日本学士院の論文

著者

• FURUMOTO MUNEYOSHI

  Department of Earth Science, Faculty of Science, Kanazawa University

• KUDO Takeshi

  International Frontier Program on Earthquake Research, The Institute of Physical and Chemical Resear

関連論文

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• Effective elastic thickness of island arc lithosphere under Japan
• Measurement of radioactive heat generation in rocks by means of gamma ray spectrometry : Vertical distribution of heat source in the island arc crust
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• Rayed craters on the far side of the Moon
• Characterization of crustal structures by fractal analysis of gravity anomalies

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