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Review: Progress in Rotational Ground-Motion Observations from Explosions and Local Earthquakes in Taiwan

U.S. Geological Survey, MS 977, 345 Middlefield Road, Menlo Park, California 94025 lee{at}usgs.gov

Bor-Shouh Huang

Institute of Earth Sciences, Academia Sinica, P.O. Box 1-55, Nankang, 11529 Taipei, Taiwan

Charles A. Langston

Center for Earthquake Research and Information, University of Memphis, 3876 Central Avenue, Suite 1, Memphis, Tennessee 38152-3050

Chin-Jen Lin and Chun-Chi Liu

Institute of Earth Sciences, Academia Sinica, P.O. Box 1-55, Nankang, 11529 Taipei, Taiwan

Tzay-Chyn Shin

Seismological Observation Center, Central Weather Bureau, 64 Kung Yuan Road, 10048 Taipei, Taiwan

Ta-Liang Teng

Department of Earth Sciences, University of Southern California, Los Angles, California 90089

Chien-Fu Wu

Seismological Observation Center, Central Weather Bureau, 64 Kung Yuan Road, 10048 Taipei, Taiwan

Rotational motions generated by large earthquakes in the far field have been successfully measured, and observations agree well with the classical elasticity theory. However, recent rotational measurements in the near field of earthquakes in Japan and in Taiwan indicate that rotational ground motions are 10 to 100 times larger than expected from the classical elasticity theory. The near-field strong-motion records of the 1999 M_w 7.6 Chi-Chi, Taiwan, earthquake suggest that the ground motions along the 100 km rupture are complex. Some rather arbitrary baseline corrections are necessary in order to obtain reasonable displacement values from double integration of the acceleration data. Because rotational motions can contaminate acceleration observations due to the induced perturbation of the Earth’s gravitational field, we started a modest program to observe rotational ground motions in Taiwan.

Three papers have reported the rotational observations in Taiwan: (1) at the HGSD station (Liu et al., 2009), (2) at the N3 site from two TAiwan Integrated GEodynamics Research (TAIGER) explosions (Lin et al., 2009), and (3) at the Taiwan campus of the National Chung-Cheng University (NCCU) (Wu et al., 2009). In addition, Langston et al. (2009) reported the results of analyzing the TAIGER explosion data. As noted by several authors before, we found a linear relationship between peak rotational rate (PRR in mrad/sec) and peak ground acceleration (PGA in m/sec²) from local earthquakes in Taiwan, PRR=0.002+1.301 PGA, with a correlation coefficient of 0.988.

This article has been cited by other articles:

				W. H. K. Lee, H. Igel, and M. D. Trifunac Recent Advances in Rotational Seismology Seismological Research Letters, May 1, 2009; 80(3): 479 - 490. [Full Text] [PDF]

				W. H. K Lee, M. Celebi, M. I. Todorovska, and H. Igel Introduction to the Special Issue on Rotational Seismology and Engineering Applications Bulletin of the Seismological Society of America, May 1, 2009; 99(2B): 945 - 957. [Abstract] [Full Text] [PDF]

				C.-C. Liu, B.-S. Huang, W. H. K. Lee, and C.-J. Lin Observing Rotational and Translational Ground Motions at the HGSD Station in Taiwan from 2007 to 2008 Bulletin of the Seismological Society of America, May 1, 2009; 99(2B): 1228 - 1236. [Abstract] [Full Text] [PDF]

				C.-F. Wu, W. H. K. Lee, and H.-C. Huang Array Deployment to Observe Rotational and Translational Ground Motions along the Meishan Fault, Taiwan: A Progress Report Bulletin of the Seismological Society of America, May 1, 2009; 99(2B): 1468 - 1474. [Abstract] [Full Text] [PDF]