Publication Date:
2012-05-19
Description:
We investigate rotational motions derived from measurements by arrays of translational seismometers-hereafter called array-derived rotations (ADRs)-and compare these to measurements made by a commercially available point rotation sensor (eentec™ R-1™). We focus on two aspects of the array problem: (1) the requisite conditions for calculating an ADR well and (2) the effect of array configuration on the result. Our data set consists of translational accelerations and rotation rates recorded by an array of Kinemetrics™ EpiSensor™ accelerometers and two R-1™ rotational sensors in the TAIPEI 101 building in Taipei, Taiwan. Our results indicate that (1) array configuration affects the accuracy of ADRs about orthogonal components in horizontal plane, (2) coherence between two point rotation measurements (two R-1™) can determine the maximum frequency of translations viably used for the calculating ADRs, and (3) the performance of the R-1™ is adequate, at least above a frequency of 0. 12 Hz (periods shorter than 8 s). We also discuss deriving strain from the same array. © 2012 Springer Science+Business Media B.V.
Print ISSN:
1383-4649
Electronic ISSN:
1573-157X
Topics:
Geosciences
,
Physics
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