Abstract
Various authors, analysing the set of accelerograms recorded at Gubbio Piana (GBP) (central Italy), have demonstrated that strong amplification occurs at this accelerometric station, which is installed within an alluvial basin. In particular, Ambraseys et al. [(2005a), Bull Earthq Eng 3:1–53; (2005b), Bull Earth Eng 3:55–73] observed that the strong motion peaks at GBP greatly exceed the median values predicted by the attenuation relationships they derived for Europe. In this work, we analyse and discuss some characteristics of the ground motion recorded at the GBP station. We show that the ground motion parameters, such as peak-ground acceleration and peak-ground velocity, are strongly influenced by the presence of locally induced surface waves that produce both a lengthening of the significant shaking duration and an increase in the peak values with respect to a nearby bedrock site. The basin-induced surface waves are observed in the three components of motion and their effects on the peak values are particularly evident in the vertical component. In the frequency domain, the energy of the surface waves is mostly restricted to the frequency band 0.4–0.8 Hz for both the horizontal and vertical components. The horizontal and vertical Fourier amplitudes are also very similar, and this indicates that the H/V spectral ratio technique is not applicable to describing the site response due to the propagation of seismic wave in a complex 2D/3D geological structure. Finally, a preliminary polarization analysis shows that the directions of polarization, as well as the degree of elliptical polarization, exhibit a strong variability with time, that may be related to a complex propagation of Love and Rayleigh waves within the basin.
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Ambraseys NN, Douglas J, Sarma SK, Smit PM (2005a) Equation for the estimation of strong ground motions from shallow crustal earthquakes using data from Europe and the Middle East: horizontal peak ground acceleration and spectral acceleration. Bull Earthquake Eng 3:1–53
Ambraseys NN, Douglas J, Sarma SK, Smit PM (2005b) Equation for the estimation of strong ground motions from shallow crustal earthquakes using data from Europe and the Middle East: vertical peak ground acceleration and spectral acceleration. Bull Earth Eng 3:55–73
Bindi D, Castro RR, Franceschina G, Luzi L, Pacor F (2004) The 1997–1998 Umbria-Marche sequence (Central Italy): source, path, and site effects estimated from strong motion data recorded in the epicentral area. J Geophys Res 109(B04312), DOI:10.1029/2003JB002857
Bindi D, Luzi L, Pacor F, Franceschina G, Castro RR (2006) Ground motion prediction from empirical attenuation relationships versus recorded data: the case of the 1997–1998 Umbria-Marche (Central Italy) strong motion data-set. Bull Seism Soc Am 96:984–1002 DOI:10.1785/0120050102
Castro RR, Anderson JG, Singh SK (1990) Site response, attenuation and source spectra of S-waves along the Guerrero, Mexico, Subduction Zone. Bull Seism Soc Am 80:1481–1503
Castro RR, Pacor F, Bindi D, Franceschina G, Luzi L (2004) Site response of strong motion stations in the Umbria region, Central Italy. Bull Seism Soc Am 94:576–590
Chavez-Garcia FJ, Faccioli E (2000) Complex site effects and building codes: making the leap. J Seism 4:23–40
Choi Y, Stewart JP, Graves RW (2005) Empirical model for basin effects accounts for basin depth and source location. Bull Seism Soc Am 94:1412–1427
Collettini C, Barchi MR, Chiaraluce L, Mirabella F, Pucci S (2003) The Gubbio fault: can different methods give pictures of the same object? J Geodyn 36:51–66
Diallo MS, Kulesh M, Holschneider, Scherbaum F (2005) Instantaneous polarization attributes in the time-frequency domain and wave field separation. Geophys Prospect 53:723–731
GE.MI.NA (1963) Ligniti e torbe dell’Italia Centrale. Geomineraria Nazionale, Torino, p319.
Graves RW, Pitarka A, Sommerville PG (1998) Ground motion amplification in the Santa Monica area: effects of shallow basin edge structure. Bull Seism Soc Am 88:1224–1242
Haskell NA (1953) The dispersion of surface waves on multilayered media. Bull Seism Soc Am 43:17–34
Hurby CE, Beresnev IA (2003) Empirical corrections for basin effects in stochastic ground-motion prediction, based on the Los Angeles basin analysis. Bull Seism Soc Am 93:1679–1690
Joyner WB (2000) Strong motion from surface waves in deep sedimentary basins. Bull Seism Soc Am 90:S95–S112
Lermo J, Chavez-Garcia FJ (1993) Site effect evaluation using spectral ratios with only one station. Bull Seism Soc Am 83:1501–1506
Luzi L, Bindi D, Franceschina G, Pacor F, Castro RR (2005) Geotechnical site characterisation in the Umbria Marche area and evaluation of earthquake site-response. Pure Appl Geophs 162:2133–2161
Makra K, Raptakis D, Chavez-Garcia FJ, Pitilakis K (2001) Site effects and design provisions: the case of Euroseistest. Pure and Appl Geophs 158:2349–2367
Menichetti M (1992) Evoluzione Tettonico-Sedimentaria della valle di Gubbio. Studi Geologici Camertil: 155–163 (in Italian)
Mirabella F, Ciaccio MG, Barchi MR, Merlini S (2004) The Gubbio normal fault (Central Italy): geometry, displacement distribution and tectonic evolution. J Struct Geol 26:2233–2249
Morelli A, Ekstrom G, Olivieri M (2000) Source properties of the 1997–1998 central Italy earthquake sequence from inversion of long-period and broadband seismograms. J Seism 4:365–375
Morozov IB, Smithson SB (1996) Istantaneous polarization attributes and directional filtering. Geophysics 61:872–881
Olsen KB (2000) Site amplification in the Los Angeles basin from three-dimensional modelling of ground motion. Bull Seism Soc Am 90:S77–S94
Pucci S, De Martini PM, Pantosti D, Valensise G (2003) Active tectonics in the Gubbio Basin (Central Italy): a contribution to the understanding of potential sources for damaging earthquakes in the area. Ann Geophys 46(5):837–864
Schimmel M, Gallart J (2003) The use of instantaneous polarization attributes for seismic signal detection and image enhancement. Geophys J Int 155:653–668
Sanchez-Sesma FJ, Ramos-Martinez J, Campillo M (1993) An Indirect Boundary Element method applied to simulate the seismic response of alluvial valleys for incident P, S and Rayleigh waves. Earth Eng Struct Dyn 22:279–295
SSN—Monitoring System Group (2002) The strong motion Records of Umbria-Marche sequence (September 1997 – June 1998). CD-ROM
Thomson WT (1950) Transmission of elastic waves through a stratified solid medium. J Appl Phys 21:89–93
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Pacor, F., Bindi, D., Luzi, L. et al. Characteristics of strong ground motion data recorded in the Gubbio sedimentary basin (Central Italy). Bull Earthquake Eng 5, 27–43 (2007). https://doi.org/10.1007/s10518-006-9026-x
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DOI: https://doi.org/10.1007/s10518-006-9026-x