Seismically active column and volcanic plumbing system beneath the island arc of the Izu-Bonin subduction zone

0332503 - GFÚ 2010 RIV GB eng J - Journal Article
Špičák, Aleš - Vaněk, Jiří - Hanuš, Václav
Seismically active column and volcanic plumbing system beneath the island arc of the Izu-Bonin subduction zone.
Geophysical Journal International. Roč. 179, č. 3 (2009), s. 1301-1312. ISSN 0956-540X. E-ISSN 1365-246X
Institutional research plan: CEZ:AV0Z30120515
Keywords : seismicity and tectonics * volcano seismology * subduction zone processes * volcanic arc processes * magma migration and fragmentation * Pacific Ocean
Subject RIV: DC - Siesmology, Volcanology, Earth Structure
Impact factor: 2.435, year: 2009

A detailed spatio-temporal analysis of teleseismic earthquake occurrence (mb > 4.0) along the convergent margin of the Izu-Bonin-Mariana arc system reveals an anomalously high concentration of events between 27° and 30.5°N, beneath a chain of seamounts between Tori-shima and Nishino-shima volcanoes. This seismicity is dominated by the 1985/1986 earthquake swarm represented in the Engdahl-van der Hilst-Buland database by 146 earthquakes in the body wave magnitude range 4.3-5.8 and focal depth range 1-100 km. The epicentral cluster of the swarm is elongated parallel to the volcanic chain. Available focal mechanisms are consistent with an extensional tectonic regime and reveal nodal planes with azimuths close to that of the epicentral cluster.
Permanent Link: http://hdl.handle.net/11104/0177749