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  • 1
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    Amplification on topographic irregularities: the role of morphology versus the subsurface geological structure (2015)
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    Publication Date: 2015-08-17
    Description: Amplification effects on topographic irregularities have been thoroughly studied in the last decades. Although the number of observations is significantly increased, many aspects are still controversial. The main difficulty is to reproduce the level of amplification through theoretical models as the dependence of ground motion on the topography geometry and shape is not systematic. Moreover, observed amplification often realizes along a site-specific azimuth with a not clear theoretical explanation in terms of topographic features. Recent studies performed by the NERA-JRA1 working group have found that amplification at rock-sites on topographic irregularities is rather controlled by the subsurface velocity structure, high levels occurring at non-A sites of the Eurocode-8 classification. We present the results of seven study cases in central Apennines (Nocera Umbra, Narni, Cerreto Laziale, Introdacqua, Rovere, Campo Imperatore, Monte Ocre) trying to deepen the dualism between morphology and rock properties based on similarity and diversity of effects among them. Ground motion properties are investigated through earthquake and ambient noise records and nearsurface velocity profiles are assessed at some sites. In particular we focus on the role of rock fractures on topography. Fractures play a double role in decreasing the near-surface Vs values because of weathering and generating anisotropy in the rock compliance. As a matter of fact, the occurrence of strong directional amplification is common to all the investigated sites, and we ascribe this effect to the oriented fracture field of the sites. Results from structural geological surveys confirms the strict dependence of directional amplification on rock fractures. Since topographic irregularities and rock fractures coexist in the Apennines, we conclude that this is a key point to interpret amplification at sites with pronounced topography.
    Description: Unpublished
    Description: Vienna
    Description: 3T. Pericolosità sismica e contributo alla definizione del rischio
    Description: open
    Keywords: Topographic Amplification ; Directional amplification ; 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 2
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    Imaging the three-dimensional architecture of the Middle Aterno basin (2009 L’ Aquila earthquake, Central Italy) using ground TDEM and seismic noise surveys: preliminary results (2016)
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    Publication Date: 2017-04-04
    Description: We present preliminary results from a multidisciplinary geophysical approach ap- plied to the imaging of the three-dimensional architecture of the Middle Aterno basin, close to the epicentral area of the 2009 L’Aquila earthquake (central Italy). We collected several time domain electromagnetic soundings (TDEM) coupled with seismic noise measurements focu- sing on the characterization of the bedrock/in ll interface. Our preliminary results agree with existing geophysical data collected in the area, and show that the southeastern portion of the basin is characterized by a deepening of the Mesozoic-Tertiary bedrock down to a depth of more than 450 m. We found that a joint use of electromagnetic and seismic methods signi - cantly contributes in obtaining new insights on the 3D geometry of the Middle Aterno basin. Moreover, we believe that our combined approach based on TDEM and noise measurements can be adopted to investigate similar geological settings elsewhere.
    Description: Published
    Description: Pescina (AQ), Italy
    Description: 2T. Tettonica attiva
    Description: 3T. Pericolosità sismica e contributo alla definizione del rischio
    Description: 7A. Geofisica di esplorazione
    Description: open
    Keywords: Central Apennines ; extensional basin ; TDEM ; ambient noise ; 04. Solid Earth::04.02. Exploration geophysics::04.02.99. General or miscellaneous ; 04. Solid Earth::04.02. Exploration geophysics::04.02.04. Magnetic and electrical methods ; 04. Solid Earth::04.02. Exploration geophysics::04.02.06. Seismic methods ; 04. Solid Earth::04.02. Exploration geophysics::04.02.07. Instruments and techniques ; 04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous ; 04. Solid Earth::04.04. Geology::04.04.01. Earthquake geology and paleoseismology ; 04. Solid Earth::04.04. Geology::04.04.09. Structural geology ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous ; 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution ; 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion ; 04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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