Record details

    Earthquake clustering in the tectonic pattern and volcanism of the Andaman Sea region
    Špičák, Aleš
    Vaněk, Jiří
Publication type
    článek v odborném periodiku
Source title - serial
    Roč. 608, November
    s. 728-736
    Projekt: ME09011, GA MŠk3cav_un_auth*0252835
    Rozsah: 9 s. : P
Subject category
    Andaman Sea region
    earthquake swarm
    global seismological data
    magma intrusion
    submarine volcanism
Abstract (in english)
   Seismicity pattern in the Andaman Sea region has been analysed to interpret recent dynamics of regional submarine volcanic provinces. Hypocentral determinations and focal mechanisms of available global seismological data have been used. Frequent occurrence of earthquake swarms proved to be an important characteristic of seismicity pattern in the investigated region. Epicenters of the earthquake swarms are situated almost exclusively along a narrow belt forming the easternmost limit of the epicentral area of the Andaman Sea region. The southern zone of the belt between 6° and 10.5° N is trench parallel and coincides with the northward prolongation of the Sumatra volcanic arc. The northern zone of the belt between 10.5° and 13° N is deflected by about 45° northeast and precisely follows the complicated zigzag pattern of the rift system in the middle of the Andaman Basin.
   Earthquake occurrence in these two zones, the northern and the southern, differs by several aspects - by shape of the epicentral zones of individual swarms, by focal mechanisms and by response to the 2004 Sumatra-Andaman great earthquake.
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
Import date
    23. 10. 2014