Results 181 to 190 of about 3,488 (216)

Centroid-based Cluster Analysis of HVSR Data for Seismic Microzonation

Proceedings, 2014
atasets acquired for studies of seismic microzoning in various urban centers of Sicilian towns, have been used to test clustering analysis through a non-hierarchical centroid-based algorithm. In this context clustering techniques may be useful to identify areas with similar seismic behaviour through HVSR data.
CAPIZZI, Patrizia, MARTORANA, Raffaele, Stassi, G, D'Alessandro, Antonino, LUZIO, Dario   +4 more
openaire   +2 more sources

Comparison of Site Classification from VS30, VS10, and HVSR in Italy

Bulletin of the Seismological Society of America, 2009
The aim of this work is to verify if (1) the average of shear-wave velocity from the surface to 30 m depth (V-S30) is a good proxy of site amplification in a country with complex geology like Italy, (2) the grouping of V-S30 in different soil classes and relevant spectra in the Italian seismic codes is adequate, and (3) shallow shear-wave profiles (V ...
Gallipoli MR, Mucciarelli M
openaire   +4 more sources

Improvement of HVSR technique by cluster analysis

2013
The Horizontal to Vertical Spectral Ratio (HVSR) technique, applied to ambient noise, is widely used to quickly estimate the fundamental frequency of a site. The HVSR technique is based on numerous assumptions about the propagation medium and the nature of the seismic noise, often hard to verified.
D'ALESSANDRO, Antonino, CAPIZZI, Patrizia, LUZIO, Dario, MARTORANA, Raffaele, MESSINA, Nicola   +4 more
openaire   +1 more source

Consistency of earthquake and microtremor HVSRs derived for California sites

2021
Frequency-dependent horizontal-to-vertical spectral ratios (HVSRs) of three-component recordings provide information on site resonant frequencies, which are potentially useful for predicting site response. We compute HVSRs from Fourier amplitude spectra (FAS) using a relational database for site data mainly in California. We investigate the consistency
Wang P., Gospe T., Zimmaro P., Ahdi S. K., Yong A., Stewart J. P.   +5 more
openaire   +1 more source

HVSR Technique Improvement Using Redundant Wavelet Transform

2009
In this study we demonstrate the use of Wavelet Transform (WT) as all improvement tool for the horizontal to vertical spectral ratio (HVSR) technique. Since the use of non-stationary transients in microtremor signals remains an open question we investigate the effect of long duration undetectable (by amplitude thresholding methods) transients in HVSR ...
Filippos Vallianatos, George Hloupis
openaire   +1 more source

Combined Analysis of Ambient Vibration HVSR and Active MASW Method

Proceedings, 2014
The well-known non-uniqueness inversion problems of dispersion curves as well as the reduced resolution at higher depths could be improved by performing a combined analysis of data sets of different types. In this study, Nakamura’s technique or HVSR technique was applied to several ambient vibration recordings performed at the surface of alluvium ...
F.M. Gouveia, I.F. Lopes, R.C. Gomes
openaire   +1 more source

SESIMIC SITE CHARACTERIZATION BY HVSR APPROACH

The surface seismic methods represent non-invasive, widely accepted geophysical methods for near-surface characterization and evaluation of the local soil conditions which have significant influence on the site response during an earthquake. In this study particular attention was paid to the use of the single station microtremor Horizontal-to-Vertical
openaire   +1 more source

Detection of Spurious Maxima in the Site Amplification Characteristics Estimated by the HVSR Technique

Bulletin of the Seismological Society of America, 2001
Spurious peaks in the site amplification characteristics estimated by horizontal-to-vertical spectral ratios (HVSR) of microtremors can be generated when ground motion is characterized by negligible spectral amplitudes and instrumental/numerical noise is dominant.
openaire   +2 more sources

From HVSR to site response function: potentiality and pitfalls

2022
The capability of the ambient vibration Horizontal to Vertical Spectral Ratios (HVSR) in capturing the main aspects of the seismic resonance phenomena was explored by numerical simulations. By considering a large set of Vs profiles, HVSR curves were simulated using two different models of the ambient vibration wavefield: the Diffuse Field Approach (DFA)
Tanzini A., Paolucci E., Albarello D.
openaire   +1 more source

HVSR as a versatile tool for subsurface investigation

2022
Rajib Biswas, Vickey Sarma, Nilutpal Borah   +2 more
openaire   +1 more source