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Inversion of ground-motion data from a seismometer array for rotation using a modification of Jaeger's method

Wu-Cheng Chi, W. H. K. Lee, J. A. D. Aston, C. J. Lin and C. C. Liu
Inversion of ground-motion data from a seismometer array for rotation using a modification of Jaeger's method
Bulletin of the Seismological Society of America (December 2011) 101 (6): 3105-3109

Abstract

We develop a new way to invert 2D translational waveforms using Jaeger's (1969) formula to derive rotational ground motions about one axis and estimate the errors in them using techniques from statistical multivariate analysis. This procedure can be used to derive rotational ground motions and strains using arrayed translational data, thus providing an efficient way to calibrate the performance of rotational sensors. This approach does not require a priori information about the noise level of the translational data and elastic properties of the media. This new procedure also provides estimates of the standard deviations of the derived rotations and strains. In this study, we validated this code using synthetic translational waveforms from a seismic array. The results after the inversion of the synthetics for rotations were almost identical with the results derived using a well-tested inversion procedure by Spudich and Fletcher (2009). This new 2D procedure can be applied three times to obtain the full, three-component rotations. Additional modifications can be implemented to the code in the future to study different features of the rotational ground motions and strains induced by the passage of seismic waves.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 101
Serial Issue: 6
Title: Inversion of ground-motion data from a seismometer array for rotation using a modification of Jaeger's method
Affiliation: Academia Sinica, Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan
Pages: 3105-3109
Published: 201112
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 22
Accession Number: 2012-016393
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: U. S. Geological Survey, USA, United StatesUniversity of Warwick, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201209
Program Name: USGSOPNon-USGS publications with USGS authors
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