3. Faulting Associated with the Matswshiro Swarm Earthquakes
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概要
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Ground cracks associated with underground faulting first appeared in the Matsushiro area on April 11, 1966, during the highest seismic period of the Matsushiro swarm earthquakes. Field and instrumental surveys revealed that the fault can be traced for more than 5 km and that its maximum amount of displacement is about 50cm of left-lateral slip. The surface trace of the fault comprises a number of fissure zones which are made up of numerous en-echelon ground cracks; the fissure zones themselves are arranged in an enechelon pattern within the larger fissured area. The displacement paths and the rates of displacement were obtained by instrumental measurements. Displacements on fissure zones proceeded in direct correlation with seismic activity and other crustal deformations. In this paper, results of instrumental measurements are summarized, and the relationships of the fault movements to the earthquakes are discussed from a geological viewpoint. Further, the role of groundwater which might have affected tectonic processes, including the seismicity and crustal deformation, is examined.|松代群発地震にともなつた断層運動の野外調査および計器観測に従事してきた筆者らは,すでに二度にわたりその結果を報告してきた(Nakamura and Tsuneishi, 1966, 1967).本稿ではすでに発表された資料に,その後1967年3月までに得られたものを加えて再整理を行つた結果を提出し,他の多くの研究者による成果と合せることにより松代地震断層の地質学的意味,地震活動・地殻変動との関係について若干の考察を加える.
- 1970-03-31
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