Methods for estimating rotational components of seismic ground motion and their numerical comparisons*

Chang, Chen; Wang, Yun; Wei, Yongxiang; Li, Shuilong; Zhang, Qisheng

doi:10.29382/eqs-2020-0201-04

Cited by 1 publication

(1 citation statement)

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“…Traditional earthquake observation and seismology research only focus on translational motions, but the exploration of rotational motions has a long history (Aki & Richards, 2002; Lee et al., 2009). In the absence of suitable rotational sensors, rotational motions can be converted by array‐derived translational observations (Chen et al., 2020; Huang, 2003; Li et al., 2004; Suryanto et al., 2006). In recent years, with the development of rotational seismometers, direct observations and further study of seismic rotational motions have gradually emerged.…”

Section: Introductionmentioning

confidence: 99%

Six‐Component Earthquake Synchronous Observations Across Taiwan Strait: Phase Velocity and Source Location

Chen,

Wang,

Sun

et al. 2023

Earth and Space Science

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With the development of rotational seismometers, especially the high‐sensitivity optical seismometers, rotational motions have shown increasing benefits for calculation of dispersion curves, estimation of back azimuth and many other applications. Here we present the six‐component observations of 2019 Hualien mww6.1 earthquake simultaneously on both sides of Taiwan Strait. Seismograms and time‐frequency spectrums show that the attenuations for rotations are more significant than translations. Calculations of the surface wave phase velocity are performed for both stations through single‐station records, indicating a distinct difference owning to the instrument installation conditions and site effect. Comparison of theoretical dispersion curves is consistently in trends with estimations, and reveals the influence of higher‐mode surface waves. For the first time, we locate the source of a earthquake through intersection of two stations' back azimuths estimated through rotational methods. Results of comparing to translational polarization verify that rotational observation can distinctly reduce the deviation of source location.

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