Ryukyu+arc

Suwanose-jima volcano Location: Location: Northern Ryukyu island arc Volcano type: andesitic stratovolcano (composed of alternating layers of hardened lava, solidified ash, and rocks ejected by previous eruptions.) Status: one of the most active volcanoes in Japan Height: 700m (2,621ft) Populations: 50 (sparsely populated) Historic eruptions: 1813-14, when thick scoria deposits blanketed residential areas, and the SW crater produced two lava flows that reached the western coast. At the end of the eruption the summit of On-take collapsed forming a large debris avalanche and creating the horseshoe-shaped Sakuchi caldera, which extends to the eastern coast. The island remained uninhabited for about 70 years after the 1813-1814 eruption. Lava flows reached the eastern coast of the island in 1884.
 * Case study: Volcanic Eruption**

Date: 28 March, 2009 Size: colored plume rose 400 m above the crater Extra info:Based on information from JMA, the Tokyo VAAC reported explosions on 20 and 21 February. Details of possible resultant ash plumes were not reported. No deaths reported
 * CASE STUDY - ERUPTION**

Similar reports are made regularly; other eruptions date to: 2 March 2009, 26-28 and 30 December 2009, 5 November 2008 with frequent activity such as explosions and plumes in-between Sources: [|www.volcanoworld.wordpress.com] Posted on  April 6th 2009 by cosmicbob (cosmicbob's sources: Japan Meteorological Agency (JMA), Tokyo Volcanic Ash Advisory Center (VAAC) – “Reports provided courtesy of the Smithsonian’s Global Volcanism Program and the US Geological Survey’s Volcano Hazards Program.”) []

The Ryukyu Arc are located in an area where earthquakes are very frequent, yet only a small number of these affect the islands. Location: Okinawa Island Magnitude: 7.0 richter Date: 26th February 2010 Time: 20.31 (local time) Depth: 22km Warnings: a tsunami warning was put out to all Ryukyu islands where locals where told to evacuate seashores, moving towards higher land.
 * CASE STUDY - EARTH QUAKES**


 * Map to show areas that felt the earthquake:**