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- W1970136812 abstract "Abstract 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 2×10 -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. Generally, any asymmetry in the transfer of high frequencies in the feedback velocimeter would produce a long-period disturbance of this type. Users of near-fault broadband velocigrams may numerically simulate the disturbances, without any knowledge of their physical nature, and subtract them from the records. The decontaminated records still may have a strange, bow-shaped form, related to the near-field ramp and the static displacement (of the order of 1×10 -5 m in this article). The effects studied in this article seem to have a general character, for apparently any feedback-controlled broadband velocimeter." @default.
- W1970136812 created "2016-06-24" @default.
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- W1970136812 date "2010-01-27" @default.
- W1970136812 modified "2023-10-18" @default.
- W1970136812 title "Toward Understanding Subtle Instrumentation Effects Associated with Weak Seismic Events in the Near Field" @default.
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- W1970136812 doi "https://doi.org/10.1785/0120090087" @default.
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