Record details

Title
    Discontinuous nature of the lower part of the South American Wadati-Benioff Zone in the Africa elbow region
Statement of responsibility
    Václav Hanuš, Alice Slancová, Aleš Špičák, Jiří Vaněk
Author
    Hanuš, Václav
    Slancová, Alice
    Špičák, Aleš
    Vaněk, Jiří
Language
    anglicky
Source title - serial
    Studia geophysica et geodaetica
Vol./nr.
    Roč. 43, č. 2
Pages
    s. 163-184
Year
    1999
Notes
    16 obr., 1 tab.
    il.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Stud. geophys. geod. (Praha)
Subject group
    deska tektonická
    diskontinuita
    hypocentrum
    ohniskový mechanismus
    subdukce
    zemětřesení
    zóna Benioffova
Geographical name
    Amerika jižní
    Arica Elbow (Chile)
    Chile
    Pacifik
    Peru
Keyword
    Africa
    American
    Discontinuous
    Elbow
    Lower
    Nature
    Region
    South
    Wadati-Benioff
    Zone
Abstract (in english)
   The Africa Elbow region represent that part of Andean South America where the azimuth of the strike of the Peru-Chile trench changes from 150ř to 190ř. The area under study is roughly bounded by latitudes 17řS and 26řS. The shape of the Wadati-Benioff zone was studied in terms of the distribution of ISC hypocentres dated between 1964 and 1993. A system of 22 vertical cross-sections, perpendicular to the trench axis, and a map of epicentres was used to derive the detailed shape of the Wadati-Benioff zone of the presently descending slab. The distribution of earthquake foci indicates a fingerlike shape of the lower part of the Wadati-Benioff zone beneath the aseismic gap. The slab length shows small changes around 350 km in the northern sections, pronounced length oscillations between 350 and 750 km in the neighbouring central sections and a constant value of 650 km in the southern sections. The dip and thickness of the Wadati-Benioff zone are practically constant in all sections.
   Fault plane solutions, separated spatially into three zones, were used to estimate the state of stress in the slab
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    11. 6. 2007
Import date
    8. 8. 2012