Record details

Title
    Toward understanding subtle instrumentation effects associated with weak seismic events in the near field
Author
    Plešinger, Axel
    Zahradník, J.
Language
    anglicky
Publication type
    článek v odborném periodiku
Source title - serial
    Bulletin of the Seismological Society of America
Vol./nr.
    Roč. 100, č. 1
Pages
    s. 59-73
Year
    2010
Notes
    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
Keyword
    Associated
    Effects
    Events
    Field
    Instrumentation
    Near
    Seismic
    Subtle
    Toward
    Understanding
    Weak
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.
Contributor
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
    U
Import date
    9. 12. 2013