Record details

Title
    Seismically active column and volcanic plumbing system beneath the island arc of the Izu-Bonin subduction zone
Author
    Hanuš, Václav
    Špičák, Aleš
    Vaněk, Jiří
Language
    anglicky
Publication type
    článek v odborném periodiku
Source title - serial
    Geophysical Journal International
Vol./nr.
    Roč. 179, č. 3
Pages
    s. 1301-1312
Year
    2009
Notes
    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
Keyword
    Active
    Arc
    Beneath
    Column
    Island
    Izu-Bonin
    Plumbing
    Seismically
    Subduction
    System
    Volcanic
    Zone
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.
Contributor
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
    U
Import date
    9. 12. 2013