Fracture pattern on Lamongan volcano,East Java

On aerial photographs fractures till 3 km long are shown to abound on the slopes and in the country surrounding the Lamongan volcano in the eastern spur of Java, Indonesia. Linear arrangements of maars and boccas in the same region possess orientations similar to those of the photographic lineaments. The Lamongan fracture system is compatible with a regional compression directed N15°–195°E.