Record details

    Toward understanding subtle instrumentation effects associated with weak seismic events in the near field
    Plešinger, Axel
    Zahradník, J.
Publication type
    článek v odborném periodiku
Source title - serial
    Bulletin of the Seismological Society of America
    Roč. 100, č. 1
    s. 59-73
    Projekt: GA205/07/0502, GA ČR, CZ
    Projekt: IAA300120911, GA AV ČR3cav_un_auth*0252829
    Rozsah: 15 s.
    Výzkumný záměr: CEZ:AV0Z30120515
    VZ: MSM 0021620860
Subject category
    broadband seismology
    instrumentation effects
    weak earthquakes
Abstract (in english)
   Broadband observations of small earthquakes at short epicentral distances reveal a mixture of near-field effects and instrumental artifacts. We investigated these phenomena at a station equipped with an STS-2 and CMG-40T sensor situated almost above shallow M 3.0 to 3.8 events (peak ground acceleration 2 x 10(-1) m/sec(2)). The horizontal components were systematically accompanied by tiltlike disturbances, and the tilt obtained from the STS-2 records exceeded more than 10 times the values predicted by the source model. We also observed a so far uncommonly recognized type of disturbance, whose shape is the first derivative of the tiltlike disturbance. The most likely explanation seems to be clipping of high-frequency signal peaks within the sensor system. A computational model of a broadband feedback velocimeter as a linear dynamic system with saturation proved this interpretation on a qualitative level.
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
Import date
    9. 12. 2013