Basic characteristic parameters and influencing factors of long-period ground motion records

Abstract

199 earthquake records with reliable information are selected from the PEER and NIED firstly, and the Seismo Signal software is applied to correct the baseline of original earthquake records. Then the basic characteristics and strength parameters under near-fault/far-field long-period ground motions and common ground motions are compared. Moreover, the influence on basic strength parameters affected by earthquake magnitude, rupture distance (or epicenter distance) and site condition under near-fault/far-field long-period ground motions is analyzed one by one. Study results are obtained as follows: Near-fault earthquake has high amplitude intensity and short strong-shock duration, and its energy release process is concentrated in a short time. A Far-field earthquake has a small peak of acceleration, velocity, displacement and long strong-shock duration, and its energy release process is mild. The strength parameter index PGV/PGA under long-period ground motions is beyond 0.2, and its frequency distribution is concentrated within the low-frequency band (0.1-1.0 Hz) while the frequency distribution of common ground motions is concentrated within a relatively high-frequency band (1.0-2.3 Hz); The strength parameter indexes , , , and under near-fault earthquake are greater than those under far-field earthquake. For a near-fault earthquake, the parameter index PGA decreases, and the strong-shock duration increases with the earthquake magnitude from 6.6 to 7.3, while the parameter index PGA, PGV decreases and PGV/PGA, strong-shock duration increase with the increases of rupture distance. Site-soil condition is the key factor affecting the basic strength parameter index under far-field earthquake, and the PGA, PGV parameter indexes increase under far-field earthquake with the site soil condition from class C to D and E. It is suggested to be related to the effect of filtering out high-frequency components and amplifying low-frequency components in soft site-soil.

Spectrum characterization of two types of long‐period ground motions and seismic behavior of frame‐core wall structures under multidimensional earthquake records

“…The Fourier amplitude can reflect the amplitude content of earthquake energy at each frequency, and it can clearly show the frequency components existing in the ground motions and the amplitude value corresponding to each frequency. Taking as examples of typical and actually measured near-fault pulse-like ground motion record of TCU052, far-field harmonic ground motion record of YMN010, and common ground motion record of ELC from Cheng and Bai, [19] Figure 1 shows the Fourier amplitude spectrum of three translational components about earthquake records. The low-frequency components of three translational components about near-fault pulse-like TCU052 and far-field harmonic YMN010 records are abundant, and their distributions are more concentrated in the narrow frequency domain, whereas the amplitude distributions of three translational components about common ELC records are relatively dispersed in the wide frequency domain.…”

Analysis of Acceleration Signal of Field-Structure Seismological Networks and Assessment of Far-field Earthquake Action in Shanghai

“…The attenuation rate of the long-period component of the acceleration response spectrum of the bedrock site remained unchanged with changes in epicenter distance or magnitude (Xie et al 1990). The far-field longperiod ground motion had the characteristics of low amplitude, long duration, large amplitude in the long period part of acceleration response spectrum, and obvious double peaks (Cheng and Bai 2017;Dai et al 2019).…”