Fling-step recovering from near-source waveforms database

Erika Schiappapietra, Chiara Felicetta, Maria D'Amico

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Abstract

We present an upgraded processing scheme (eBASCO, extended BASeline COrrection) to remove the baseline of strong-motion records by means of a piece-wise linear detrending of the velocity time history. Differently from standard processing schemes, eBASCO does not apply any filtering to remove the low-frequency content of the signal. This approach preserves both the long-period near-source ground-motion, featured by one-side pulse in the velocity trace, and the offset at the end of the displacement trace (fling-step). The software is suitable for a rapid identification of fling-containing waveforms within large strong-motion datasets. The ground displacement of about 600 three-component near-source waveforms has been recovered with the aim of (1) extensively testing the eBASCO capability to capture the long-period content of near-source records, and (2) compiling a qualified strong-motion flat-file useful to calibrate attenuation models for peak ground displacement (PGD), 5% damped displacement response spectra (DS), and permanent displacement amplitude (PD). The results provide a more accurate estimate of ground motions that can be adopted for different engineering purposes, such as performance-based seismic design of structures.
Original languageEnglish
Article number67
Number of pages22
JournalGeosciences
Volume11
Issue number2
DOIs
Publication statusPublished - 4 Feb 2021

Keywords

  • strong-motion
  • near-source
  • earthquake waveforms
  • permanent displacement
  • fling-step
  • waveforms processing
  • strong-motion database

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