On Conditional Simulation of Spatially Varying Rotational Ground Motion

ABSTRACT

Authors elsewhere reported two frameworks for conditional simulation of spatially varying translational ground motion, namely, (i) cross-spectral density (CSD) based framework and (ii) auto-spectral density (ASD) based framework. This paper investigates the applicability of both the frameworks for rotational components. Rotational components are extracted here using one of the Single Station Procedures reported in the literature. Spatially varying rotational ground motion for a future event is explored using a coherency model calibrated against a past event and an estimate of ASD of the seed (rotational) ground motion. Choice of representation of ASD is also investigated.

KEYWORDS:

• Spatially varying rotational ground motion
• apparent translational component
• rotational coherence model
• event-to-event variability of lagged coherency
• Torsional and rocking motion

Acknowledgments

This research is funded by SERB/DST, Government of India, under the Grant No. SB/S3/CEE/012/2013 and the financial support is acknowledged. The authors gratefully acknowledge the Institute of Earth Science, Academia, Sinica, Taiwan for sharing the strong motion data.

Additional information

Funding

This work was supported by the SERB/DST, Government of India [SB/S3/CEE/012/2013].