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The dynamic strain distribution behavior of a mortar block blasting was experimentally investigated.A development of countermeasure technique against environmental impacts such as ground vibration and flyrock in mining field is become important as well as economical and efficient aspects.The understanding of the fracture mechanism in blasting is essential to optimize the blasting design.However,it is inconvenient to conduct investigation in field experiments because that experimental rock/geological condition is difficult to arrange in actual mining field.In this study,a small-scale blasting experiment using a mortar block with well-defined property is conducted and dynamic strain distribution on the mortal block surface is analyzed by a Digital Image Correlation(DIC)method.The block was blasted by an electric detonator and 3g of Composition C4 explosive,and the behavior of the block surface was observed by two high-speed cameras and a strain profile was measured by a strain-gauge.The set of two high-speed video image sequences were used to analyze the three-dimensional strain distribution using DIC method.A point strain profile extracted from the analyzed strain distribution data was compared with a directly observed strain profile using the strain gauge.