Number of the records: 1
Toward understanding subtle instrumentation effects associated with weak seismic events in the near field
- 1.0339444 - GFÚ 2010 RIV US eng J - Journal Article
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. E-ISSN 1943-3573
R&D Projects: GA AV ČR IAA300120911
Grant - others:GA ČR(CZ) GA205/07/0502
Institutional research plan: CEZ:AV0Z30120515
Keywords : instrumentation effects * broadband seismology * weak earthquakes
Subject RIV: DC - Siesmology, Volcanology, Earth Structure
Impact factor: 2.027, year: 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.
Permanent Link: http://hdl.handle.net/11104/0182967
Number of the records: 1