Three Component Rotational Ground Motion Obtained from Explosive Source Data
Lai Xiaoling
Sun Yi
Abstract：Three component rotational ground motion is one of the most important point of geophysics research.In this paper, the rotational ground motions with three components were deduced by calculation using records of translational seismographs from explosions.The observational data used are from three shots with explosive charge of 500kg for each and observational distances of 1.8, 2.8, 8.9km respectively.The rotational motions of the array from these three shots were obtained by calculation.The largest peak angular velocities of ground motion are 41.65, 21.98 and 0.29μrads/s respectively, which are quite near the results from international colleagues.How the peak values of the ground motion decay with the epicenter distance is always the focal problem in earthquake engineering.In this paper, the peak angular velocities of ground motion are fit with exponent function, and the decay of peak values with distance is obtained.The main features of the decay curves are as follows: The values decay very fast within 1-3km and slow down gradually beyond 5km.And with the increase of the distance, the curve tends to more and more flat.
Keywords：seismologytranslational-velocityrotational-velocityseismic arrayexplosive source
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 645-651 )