Record details

    Seismically active column and volcanic plumbing system beneath the island arc of the Izu-Bonin subduction zone
    Hanuš, Václav
    Špičák, Aleš
    Vaněk, Jiří
Publication type
    článek v odborném periodiku
Source title - serial
    Geophysical Journal International
    Roč. 179, č. 3
    s. 1301-1312
    Rozsah: 12 s.
    Výzkumný záměr: CEZ:AV0Z30120515
Subject category
    magma migration and fragmentation
    Pacific Ocean
    seismicity and tectonics
    subduction zone processes
    volcanic arc processes
    volcano seismology
Abstract (in english)
   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.
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
Import date
    9. 12. 2013