Walsh変換による重力解析とその減災学への応用

概要

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Analysis of anobserved potential field anomaly in terms of its linear components has become popular in recent years. We performed gravity analysis using the Walsh transform to automatically extract known or unknown lineament structures around several focal areas. We applied 2-dimensional discrete Walsh transform to densely-distributed gravity data in Southwest Japan. In this study five regions are selected for the analysis, where a large earthquake occurred recently and earthquake faults are known to exist. Results show that gravity lineaments associated with earthquake faults can be successfully detected by the analysis. Specifically, the remarkably high Walsh outputs are found around the Atera Fault and the epicentral area of the 1984 Western Nagano Preecture earthquake. These results suggest that the Walsh gravity analysis is quite effective to detect known or unknown linea-ments having very weak and linear Bouguer gravity changes, and is also applicable to mitigation science of natural disaster.
北海道大学大学院理学研究院自然史科学部門（地球物理学） = Department of Natural History Sciences (Geophysics), Graduate School of Science, Hokkaido Universityの論文
2009-03-15