Počet záznamů: 1

Toward understanding subtle instrumentation effects associated with weak seismic events in the near field

  1. 1.
    0339444 - GFU-E 2010 RIV US eng J - Článek v odborném periodiku
    Zahradník, J. - Plešinger, Axel
    Toward understanding subtle instrumentation effects associated with weak seismic events in the near field.
    Bulletin of the Seismological Society of America. Roč. 100, č. 1 (2010), s. 59-73 ISSN 0037-1106
    Grant CEP: GA AV ČR IAA300120911
    Grant ostatní:GA ČR(CZ) GA205/07/0502
    Výzkumný záměr: CEZ:AV0Z30120515
    Klíčová slova: instrumentation effects * broadband seismology * weak earthquakes
    Kód oboru RIV: DC - Seismologie, vulkanologie a struktura Země
    Impakt faktor: 2.027, rok: 2010

    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.
    Trvalý link: http://hdl.handle.net/11104/0182967