scholarly journals Regional Seismic Characterization of Shallow Subsoil of Northern Apulia (Southern Italy)

Geosciences ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 416
Author(s):  
Enrico Paolucci ◽  
Giuseppe Cavuoto ◽  
Giuseppe Cosentino ◽  
Monia Coltella ◽  
Maurizio Simionato ◽  
...  
Keyword(s):  
Southern Italy ◽  
Carbonate Platform ◽  
Low Cost ◽  
Principal Component ◽  
Ambient Vibration ◽  
Resonance Effects ◽  
Resonance Phenomena ◽  
Single Station ◽  
Seismic Characterization

A first-order seismic characterization of Northern Apulia (Southern Italy) has been provided by considering geological information and outcomes of a low-cost geophysical survey. In particular, 403 single-station ambient vibration measurements (HVSR techniques) distributed within the main settlements of the area have been considered to extract representative patterns deduced by Principal Component Analysis. The joint interpretation of these pieces of information allows the identification of three main domains (Gargano Promontory, Bradanic Through and Southern Apennines Fold and Thrust Belt), each characterized by specific seismic resonance phenomena. In particular, the Bradanic Through is homogeneously characterized by low frequency (<1 Hz) resonance effects associated with relatively deep (>100 m) seismic impedance, which is contrasting corresponding to the buried Apulian carbonate platform and/or sandy horizons located within the Plio-Pleistocene deposits. In the remaining ones, relatively high frequency (>1 Hz) resonance phenomena are ubiquitous due to the presence of shallower impedance contrasts (<100 m), which do not always correspond to the top of the geological bedrock. These general indications may be useful for a preliminary regional characterization of seismic response in the study area, which can be helpful for an effective planning of more detailed studies targeted to engineering purposes.

Sharing Geophysical Data for Seismic Characterization of the Matera (Southern Italy) Urban Area

2021 ◽  
Author(s):  
N. Tragni ◽  
G. Calamita ◽  
L. Lastilla ◽  
V. Belloni ◽  
R. Ravanelli ◽  
...  
Keyword(s):  
Urban Area ◽  
Southern Italy ◽  
Geophysical Data ◽  
Seismic Characterization

3-D Seismic Characterization of Submarine Landslides on a Miocene Carbonate Platform (Luconia Province, Malaysia)

2004 ◽  
Vol 74 (6) ◽  
pp. 817-830 ◽  
Author(s):  
V. Zampetti ◽  
W. Schlager ◽  
J.-H. van Konijnenburg ◽  
A.-J. Everts
Keyword(s):  
Carbonate Platform ◽  
Submarine Landslides ◽  
Seismic Characterization

Reconstruction of a Reference Subsoil Model for the Seismic Microzonation of Gori (Georgia): A Procedure Based on Principal Component Analysis (PCA)

2021 ◽  
Author(s):  
Silvia Giallini ◽  
Enrico Paolucci ◽  
Pietro Sirianni ◽  
Dario Albarello ◽  
Iolanda Gaudiosi ◽  
...  
Keyword(s):  
Principal Component Analysis ◽  
Seismic Response ◽  
Principal Component ◽  
Component Analysis ◽  
Vibration Monitoring ◽  
Ambient Vibration ◽  
Geological Evidence ◽  
Local Seismic Response ◽  
Geophysical Surveys ◽  
Single Station

ABSTRACT This article focuses on the full exploitation of geological and economically viable geophysical surveys for the seismic characterization of the shallow subsoil in the frame of microzonation studies in urban areas where economic resources for detailed seismic response analyses are scarce. In these conditions, the outcomes of inexpensive geophysical surveys (e.g., based on ambient vibration monitoring or surface-wave prospecting) must be fully exploited. To reduce the uncertainties related to these kinds of procedures, their joint interpretation in the light of geological evidence is mandatory. To this purpose, we propose the application of principal component analysis to combine the results of distributed single-station ambient vibration measurements (horizontal-to-vertical spectral ratio [HVSR] technique) to provide a preliminary zonation of the study area. The zones identified in this way are then characterized by considering the available geognostic boreholes, VS profiles deduced by the joint inversion of HVSR curves, and available Rayleigh-wave dispersion curves deduced from active seismic prospecting (multichannel analysis of surface-waves technique). The final outcome allows the definition of a preliminary seismic model of the study area, which is also constrained by the available geological data deduced from on-purpose surveys. The proposed approach has been applied to the city of Gori (Georgia). The proposed approach allowed a reliable assessment of buried geometries, geological domains, and the distribution of lithofacies, which can control the local seismic response. In detail, the major role of paleovalley infills and interfluve domains has been enlightened by adding in evidence concerning the peculiar stratigraphic relationships and buried morphologies, which may determine 1D and 2D resonance effects.

scholarly journals Sub-surface characterization of the Anphiteatrum Flavium Area (Rome, Italy) through single-station ambient vibration measurements

2017 ◽  
Vol 60 (4) ◽  
Author(s):  
Salomon Hailemikael ◽  
Giuliano Milana ◽  
Fabrizio Cara ◽  
Maurizio Vassallo ◽  
Marta Pischiutta ◽  
...  
Keyword(s):  
Surface Characterization ◽  
Ambient Vibration ◽  
Vibration Measurements ◽  
Single Station ◽  
Ambient Vibration Measurements

scholarly journals Genetic divergence among hybrids of 'Cravo' mandarin with 'Pêra' sweet orange

2003 ◽  
Vol 60 (1) ◽  
pp. 115-118 ◽  
Author(s):  
Roberto Pedroso de Oliveira ◽  
Carlos Ivan Aguilar-Vildoso ◽  
Marcos Antônio Machado
Keyword(s):  
Principal Components ◽  
Genetic Divergence ◽  
Genetic Similarity ◽  
Sweet Orange ◽  
Low Cost ◽  
Principal Component ◽  
Optimization Method ◽  
Genetic Distances ◽  
F1 Hybrids

Molecular markers have been used as tools in breading programs of sexual hybridation, allowing the genetic characterization of a large number of genotypes. The RADP markers are the most used since the employed techniques are simple and of low cost. To evaluate the genetic divergence among F1 hybrids of 'Cravo' mandarin (Citrus reticulata Blanco) and 'Pêra' sweet orange (C. sinensis (L.) Osbeck), this study analyses the variability and similarity of the hybrids among themselves and with their parents. Random Amplified Polimorfic DNA marker analysis, with 102 primers, were applied to a population composed of 94 hybrids and their parents. Multivariate genetic divergence analysis of the principal components and Tocher grouping were carried out only considering the polymorphic fragments. Genetic distances were calculated by the arithmetic complement of the Jaccard index. Bidimensional dispersion graphs among hybrid and parent distances and of the divergence analysis by principal components were constructed. High genetic similarity among Cravo and Pêra varieties and their hybrids was verified, showing a casual distribution from the hybrids in relation to the parents, but in intermediary positions. The principal component analysis showed little applicability in the study of hybrid genetic divergence. The hybrids and parents were classified in groups based on the genetic similarity, using the Tocher optimization method.

Seismic modelling of outcrop carbonate systems: an application to the Cretaceous platform-to-basin system of the Maiella Mountain (Central Apennines, Italy)

2020 ◽  
pp. SP509-2019-81
Author(s):  
V. Mascolo ◽  
I. Lecomte
Keyword(s):  
Carbonate Platform ◽  
Central Italy ◽  
Hydrocarbon Exploration ◽  
Seismic Survey ◽  
Published Data ◽  
Offshore Area ◽  
Seismic Modelling ◽  
Seismic Characterization ◽  
Seismic Models

AbstractForward seismic models of outcrop analogues are used in hydrocarbon exploration to generate more coherent geological-geophysical models that provide an important scale link between outcrops and seismic survey data. Exploration within slope carbonate plays can be problematic with uncertainties about the reservoir geometries, distribution and volumes due to complex seismic imaging and lack of closely-spaced wells. This seismic modelling study provides a synthetic seismic characterization of the carbonate platform-to-slope-to-basin transition exposed across the Maiella Mountain, central Italy. This outcrop represents an analogue for exploration in carbonate slope strata in the Adriatic offshore area. Integration of original and previously published data allows 2D and 3D geological modelling, providing a better characterization of relationships between the paleoescarpment and resedimented deposits. The seismic response of the various geological features of this transitional carbonate system is simulated via synthetic seismic modelling by using innovative, modern techniques. The seismic simulation was performed in both post-stack-time- and pre-stack-depth-migrated domains. These synthetic seismic models help understand and predict seismic architecture and character of the paleoescarpment and resedimented slope deposits.

Sign in / Sign up

Export Citation Format

Share Document