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Lin巴amentanalysis targeting both the land and the sea floor is important for comprehensive understanding of local and regional fracture systems, because som巴ofthe major lineaments are related to fracture zones that can emplace mineral and geothermal resources. For this reason, we have developed an automatic extraction method of lineaments, the Segment Tracing Algorithm (ST A), and a vector-analysis technique to calculate azimuths and dips of interpreted fractures through the combination of lineament data and digital elevation model (DEM) data. The Kyushu district, southwest Japan, is chosen as a study area and 77,893 lineaments ar巴derivedfrom the three full-scene LANDSAT TM band 4 images of the district. For the rich epithermal gold deposits, it is illustrated that the azimuths of the continuous fractures estimated near the deposits correspond generally to those of the principal veins. This correlation suggests an angular relationship between directional emplacement of the gold deposits and the tectonics that produced the fractures oriented in the estimated directions. For the geothermal field in the middle Kyushu, the significant fractures which act as conduits for transport of hydrothermal fluids to the ground surface can be identified. In addition, a lineament analysis for the sea floor is conducted using the shaded DEM of 1 km mesh, produced by interpolating th巴 sea-depthdata. A combination of lineament maps of the land and the sea floor is useful to identify tectonically significant lineaments that are continuous over the two regions and consider a genetic mechanism of the fracture systems.

Characterizing fracture systems of Kyushu, southwest Japan through satellite-image derived lineaments superimposed on topographic and lithologic data