Boso triple junction

[1] The Boso triple junction is named after the Bōsō Peninsula.

Located some 300 kilometres (190 mi) from the Boso triple junction, Tokyo is subject to quakes and tsunamis generated from slips along this junction.

Furthermore, there is a large populated region along the coast of the main island that would also be subject to damage.

This junction probably has the highest associated insurance risk in the world, due to its proximity to extensive urban development.

The 2011 Tōhoku earthquake and tsunami were generated along the Japan trench well to the north of the junction and did not involve the other two trenches, although quakes that may have been aftershocks have been observed there[clarification needed].