Journal of Seismology

, Volume 16, Issue 4, pp 709–720 | Cite as

Investigation of ground rotational motions caused by direct and scattered P-waves from the 4 March 2008 TAIGER explosion experiment

  • Nguyen Dinh PhamEmail author
  • Bor-Shouh Huang
  • Chin-Jen Lin
  • Tuan-Minh Vu
  • Ngoc-Anh Tran
Original Article


High-frequency rotational motions of P-waves and coda waves were analysed using rotation rate sensors and strong motion array data from the 4 March 2008 TAiwan Integrated GEodynamics Research (TAIGER) explosion experiment in northeastern Taiwan. Theoretical and observational investigations focussed on the effects of this experiment on the free surface. The main goal of this study was to explore possible applications of combined measurements of artificial explosion-derived translational and rotational motions. Also investigated was the consistent ground rotation observed directly by rotation rate sensors and derived using translational seismic arrays. Common near-source high-frequency rotational motion observations and array-recorded translational motions from one shallow borehole explosion are analysed in this study. Using a half-space assumption of plane P-wave propagation across the recording site, we conclude that: (1) rotational motions induced by direct P-waves interacting with a free surface in theory can be used to estimate wave radial direction, velocity and anisotropic properties; (2) rotational motions derived from scattering are predominant among the observed rotations during the TAIGER explosion experiments and allow us to image the heterogeneous structure of the medium at the investigated site; and (3) rotation sensor measurements undertaken during TAIGER explosion experiments may be affected by cross-axis sensitivities, which need to be considered when using the data obtained during these experiments.


Rotational motion P wave Wave radial direction Wave velocity Anisotropy Scattering 



We thank Heiner Igel and other members of the Seismology Group at Ludwig Maximilians University Munich for providing synthetic seismograms. We are grateful to William H.K. Lee and the International Working Group on Rotational Seismology for providing observation data from the TAIGER explosions. Nguyen Dinh Pham, Ngoc-Anh Tran and Tuan-Minh Vu would like to thank the Vietnam National Foundation for Science and Technology Development (NAFOSTED) for financial support through Project 105.04-2010.07. Anonymous reviewers provided helpful comments and suggestions that improved the manuscript.


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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Nguyen Dinh Pham
    • 1
    Email author
  • Bor-Shouh Huang
    • 2
  • Chin-Jen Lin
    • 2
  • Tuan-Minh Vu
    • 1
  • Ngoc-Anh Tran
    • 1
  1. 1.Institute of GeophysicsVietnam Academy of Science and TechnologyHanoiVietnam
  2. 2.Institute of Earth SciencesAcademia SinicaTaipei 115Republic of China

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