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Seismic-wave strain, rotation, and gradiometry for the 4 March 2008 TAIGER explosions

Charles A. Langston, William H. K. Lee, Chin-Jen Lin and Chun-Chi Liu
Seismic-wave strain, rotation, and gradiometry for the 4 March 2008 TAIGER explosions (in Rotational seismology and engineering applications, William H. K. Lee (editor), M. Celebi (editor), M. I. Todorovska (editor) and Heiner Igel (editor))
Bulletin of the Seismological Society of America (May 2009) 99 (2B): 1287-1301


Acceleration spatial gradients, horizontal strains, and horizontal rotation were computed using strong-motion array data from the 4 March 2008 TAIGER explosions in northeastern Taiwan and used in conjunction with the original three component acceleration data to perform a gradiometric analysis of the strong ground motion wave train. The analysis yields a complex, frequency-dependent view of the nature of seismic-wave propagation over short propagation distances that imply significant lateral velocity changes in structure. Areal strain and rotation about the vertical axis have equal amplitudes and suggest significant wave scattering within the confines of the river valley where the experiment was performed and/or significant departure from an axisymmetric explosion source. Gradiometry shows that the P wave arrives at the array 35 degrees off-azimuth clockwise from the straight-line path and appears to have been refracted from the northern side of the valley. Large, slowly propagating secondary surface waves initially arrive 45 degrees counterclockwise from the straight-line path but later arrivals are seen to propagate in all directions, including back toward the explosion source. A frequency-dependent radiation pattern for the triple-borehole explosion in comparison to the single-borehole explosion explains the differences in the maximum amplitudes between the sources seen in the acceleration data. The use of seismic strain and rotation with standard particle motion wave fields at a single location allows for a direct view of seismic-wave propagation that illuminates the true nature of the seismogram.

ISSN: 0037-1106
EISSN: 1943-3573
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 99
Serial Issue: 2B
Title: Seismic-wave strain, rotation, and gradiometry for the 4 March 2008 TAIGER explosions
Title: Rotational seismology and engineering applications
Author(s): Langston, Charles A.Lee, William H. K.Lin, Chin-JenLiu, Chun-Chi
Author(s): Lee, William H. K.editor
Author(s): Celebi, M.editor
Author(s): Todorovska, M. I.editor
Author(s): Igel, Heinereditor
Affiliation: University of Memphis, Center for Earthquake Research and Information, Memphis, TN, United States
Affiliation: U. S. Geological Survey, Palo Alto, CA, United States
Pages: 1287-1301
Published: 200905
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
Meeting name: First international workshop on Rotational seismology and engineering applications
Meeting location: Menlo Park, CA, USA, United States
Meeting date: 20070918Sept. 18-19, 2007
References: 10
Accession Number: 2009-050056
Categories: Seismology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch maps
N22°00'00" - N25°30'00", E119°15'00" - E122°00'00"
Secondary Affiliation: University of Southern California, USA, United StatesLudwig Maximilians Universitaet Muenchen, DEU, Federal Republic of GermanyAcademia Sinica, TWN, Taiwan
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: 200927
Program Name: USGSOPNon-USGS publications with USGS authors
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