Fling effects from near-source strong-motion records: insights from the 2016 M w 6.5 Norcia, Central Italy, Earthquake

Maria D'Amico, Chiara Felicetta, Erika Schiappapietra, Francesca Pacor, František Gallovič, Roberto Paolucci, Rodolfo Puglia, Giovanni Lanzano, Sara Sgobba, Lucia Luzi

Research output: Contribution to journalArticle

6 Citations (Scopus)
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Abstract

We propose a semiautomatic processing scheme (extended BASeline Correction [eBASCO]) for recovering the tectonic fling from near-source records. The method, based on a piecewise linear detrend of the strong-motion (SM) recordings, is applied to reconstruct the ground displacement field of the 30 October 2016 M w 6.5 earthquake in central Italy. The robustness of the results is checked against geodetic measurements, remote sensing data, ground-motion simulations, and existing empirical models for fling amplitude. The outcomes of eBASCO are analyzed with the goal of testing its capability to preserve long-period content in near-source SM recordings affected by tectonic fling, different from standard processing schemes based on bandpass filtering. Comparison of peak ground displacements, peak ground velocities, and spectral displacements shows that long-period ground motion recorded over and in proximity of the fault can be underestimated by standard processing. Spectral displacement ordinates can diverge up to the 25% for periods longer than 5 s when an appropriate baseline correction is made.

Original languageEnglish
Pages (from-to)659-671
Number of pages13
JournalSeismological Research Letters
Volume90
Issue number2A
Early online date27 Dec 2018
DOIs
Publication statusPublished - 1 Mar 2019

Keywords

  • tectonic fling
  • near‐source records
  • strong-motion recordings

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