Fig. 1

Photographic images for run I4-1. The specimen is a coarse grained Inada granite. With sensitivity of ISO 3200 and F (lens opening) of 1.4, our photographs are similar to images that humans visually sense. Shutter speed is set to 3 s and photographs are saved in uncompressed data format. Images in the second row (d—f) are taken from the direction 90° counterclockwise from the angle for the first row images (a–c) for the same run. (a) and (d): images of the rock specimen before the loading, which are taken during daylight. Color markers on both ends of the sample are drawn to record the sample orientation and are irrelevant to the result. Size of the specimen is 5 cm in diameter and 12 cm in height. (b) and (e): images of luminescence radiated from this specimen. These images are intensified to highlight locations of the bright spots by simply multiplying each of RGB value 4 folds. (c) and (f): Images of specimen after the faulting. For this experimental run, we successfully recovered two largest fragments of this specimen that are split by a well developed fault plane spontaneously developed during its fracture and reassemble them to reconstruct the original column shape. Two largest fragments are assembled together to the original column shape. The fault plane runs from the top center downward to the left in (c), and from the top left to the bottom right in (f).