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

SYSNO ASEP	0339444
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Toward understanding subtle instrumentation effects associated with weak seismic events in the near field
Author(s)	Zahradník, J. (CZ) Plešinger, Axel (GFU-E)
Source Title	Bulletin of the Seismological Society of America. - : Seismological Society of America - ISSN 0037-1106 Roč. 100, č. 1 (2010), s. 59-73
Number of pages	15 s.
Language	eng - English
Country	US - United States
Keywords	instrumentation effects ; broadband seismology ; weak earthquakes
Subject RIV	DC - Siesmology, Volcanology, Earth Structure
R&D Projects	IAA300120911 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
CEZ	AV0Z30120515 - GFU-E (2005-2011)
UT WOS	000274149900003
DOI	10.1785/0120090087
Annotation	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.
Workplace	Geophysical Institute
Contact	Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028
Year of Publishing	2010

Number of the records: 1