Use of Synthetic Accelerograms in Local Seismic Response Analyses at
Near Field Sites
Abstract
Local Seismic Response (LSR) studies are considerably conditioned by the
seismic input features due to the non-linear soil behavior under dynamic
loading and the sub-surface site conditions (e.g., mechanical properties
of soils and rocks and geological setting) [1][2]. The selection
of the most suitable seismic input is a key point in LSR. Unfortunately,
a few natural recordings are available at seismic stations in near field
areas [3][4]. Then, synthetic accelerograms can be helpful in
LSR analysis in urbanized near field territories. Synthetic
accelerograms are generated by simulation procedures that consider
adequately supported hypotheses about the source mechanism at the
seismotectonic region and the wave propagation path towards the surface.
Hereafter, mainshocks recorded accelerograms at near field seismic
stations during the 2016-17 Central Italy seismic sequence have been
compared with synthetic accelerograms calculated by EXSIM code [5]
[6]. The outcomes show that synthetic signals can reproduce the
high-frequency content of seismic waves at near field areas. Then, in
urbanized near field areas, synthetic accelerograms can be fruitfully
used in Microzonation studies. References [1] Vessia G. et al.
(2013), Bull. Earthq. Eng., 11(5), 1633-1660. [2] Vessia G. et al.
(2021), Eng. Geol. 284, 106031. [3] Mancini F. et al. (2018),
ESC2018, S29-639: 428429. [4] Luzi L. et al. (2016), Istituto
Nazionale di Geofisica e Vulcanologia, Observatories & Research
Facilities for European Seismology. [5] Boore D. M. (2003), Pure
Appl. Geophys. 160 635–675. [6] Motazedian D. and Atkinson G. M.
(2005), Bull. Seismol. Soc. Am. 95 995–1010.