Abstract
Characteristic distributions of shallow crustal earthquakes and active faults can indicate tectonic activity, because both are thought to arise chiefly from tectonic instability.Central Kyushu is the most seismically active region of the island. This active seismogenic region can also be defined as a NE-SW-trending active normal fault zone, which would lead to progressive spreading. On the other hand, northwestern Kyushu, including the Tsushima Strait, is postulated to have a low concentration of strain energy, and a comparatively stable condition is inferred in this region in terms of geomorphic indices and landforms. Thus, the Tsushima Strait region cannot be regarded as a potential tectonically active zone. However, the tectonics of the region are still not understood in detail. Sufficient information on Holocene marine terrace surfaces and on submarine tectonic structures in and around the Tsushima Strait remains to be obtained.
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