Journal ArticleDOI
Analysis and Modeling of hvsr in the Presence of a Velocity Inversion: The Case of Venosa, Italy
Domenico Di Giacomo,Maria Rosaria Gallipoli,Marco Mucciarelli,Stefano Parolai,Sandra M. Richwalski +4 more
TLDR
In this article, the authors analyzed nearly 2 years of data, composed of 244 triggered noise records and 44 earthquakes, taking advantage of an improved ver- sion of the Thompson-Haskell propagation matrix method.Abstract:
The aim of this work is to check the stability of the horizontal-to-vertical spectral ratios (HVSRs) calculated at the Venosa station site (Italy). This site lies over a layer of anthropogenic fill (4 m thick), a rigid layer of conglomerates (15 m thick), and a thick layer of clays (about 300 m thick) above the seismic bedrock. The velocity inversion, which takes place at the conglomerates-clays interface, is of main importance for the amplification behavior of this site. We have analyzed nearly 2 years of data, composed of 244 triggered noise records and 44 earthquakes. The results obtained by the two data sets show different site-response characteristics. In particular, the earthquake HVSR is not deamplified in the frequency range 1-8 Hz like the triggered noise HVSR. To find out the origin of this difference, we modeled both the triggered noise and the earthquakes, taking advantage of an improved ver- sion of the Thompson-Haskell propagation matrix method. The differences between triggered-noise- and earthquake-amplification functions might be explained by the difference in composition and propagation of the seismic wave fields. Moreover, we show that the nonlinear behavior of the anthropogenic fill might explain the presence of the misfit of the resonance frequency attributed to this layer between triggered noise and earthquakes.read more
Citations
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Ground Motion Characteristics Estimated from Spectral Ratio between Horizontal and Verticcl Components of Mietremors.
TL;DR: In this article, the spectral ratio between horizontal and vertical components (H/V ratio) of microtremors measured at the ground surface has been used to estimate fundamental periods and amplification factors of a site, although this technique lacks theoretical background.
Journal ArticleDOI
Empirical evaluation of microtremor H/V spectral ratio
TL;DR: In this paper, a purely empirical assessment of the actual capabilities of the horizontal-to-vertical (H/V) spectral ratio technique to provide reliable and relevant information concerning site conditions and/or site amplification is performed.
Journal ArticleDOI
Vs30: Proxy for Seismic Amplification?
TL;DR: In this article, the authors re-analyze the empirical evidence for the validity of the Vs30 parameter as a valid proxy for seismic amplification in tectonically active complex regions or in particular geological settings.
Journal ArticleDOI
Proposal for a soil classification based on parameters alternative or complementary to Vs ,30
Lucia Luzi,Rodolfo Puglia,Francesca Pacor,Maria Rosaria Gallipoli,Dino Bindi,Marco Mucciarelli +5 more
TL;DR: In this paper, the authors proposed two soil classifications in which the soil fundamental frequency (f0) becomes either an alternative or a complement to the average shear wave velocity of the upper 30 m (Vs,30) to discriminate soil categories, although some doubts arose about the capability of Vs,30 to predict actual soil amplification.
References
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Journal ArticleDOI
Free software helps map and display data
Paul Wessel,Walter H. F. Smith +1 more
TL;DR: The Generic Mapping Tools (GMT) is introduced, which is a free, public domain software package that can be used to manipulate columns of tabular data, time series, and gridded data sets and to display these data in a variety of forms ranging from simple x-y plots to maps and color, perspective, and shaded-relief illustrations.
Journal Article
A method for dynamic characteristics estimation of subsurface using microtremor on the ground surface
TL;DR: In this paper, the spectrum ratio of the horizontal components and vertical component of microtremor bears resemblance to transfer function for horizontal motion of surface layers, and the method uses vertical component and horizontal components.
Journal ArticleDOI
Ground-motion characteristics estimated from spectral ratio between horizontal and vertical components of microtremor
Katsuaki Konno,Tatsuo Ohmachi +1 more
TL;DR: In this article, the spectral ratio between horizontal and vertical components (H/V) of microtremors measured at the ground surface has been used to estimate fun-damental periods and amplification factors of a site.
Ground Motion Characteristics Estimated from Spectral Ratio between Horizontal and Verticcl Components of Mietremors.
TL;DR: In this article, the spectral ratio between horizontal and vertical components (H/V ratio) of microtremors measured at the ground surface has been used to estimate fundamental periods and amplification factors of a site, although this technique lacks theoretical background.
Journal ArticleDOI
Effects of local geology on ground motion near San Francisco Bay
TL;DR: In this article, the authors compared the ground motion generated by nuclear explosions in Nevada with the strong-motion recordings of the San Francisco earthquake of March 22, 1957, and found that areas of high amplification determined from small ground motions may also be areas with high intensity in future earthquakes.
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