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Site effects “on the rock”: the case of Castelvecchio Subequo (L’Aquila, central Italy)

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Abstract

The April 6, 2009 L’Aquila earthquake was responsible for an “anomalous”, relatively high degree of damage (i.e. Is 7 MCS scale) at Castelvecchio Subequo (CS). Indeed, the village is located at source-to-site distance of about 40 km, and it is surrounded by other inhabited centres to which considerably lower intensities, i.e. Is 5–6, have been attributed. Moreover, the damage was irregularly distributed within CS, being mainly concentrated in the uppermost portion of the old village. Geophysical investigations (ambient seismic noise and weak ground motions analyses) revealed that site effects occurred at CS. Amplifications of the ground motion, mainly striking NE–SW, have been detected at the uppermost portion of the carbonate ridge on which the village is built. Geological/structural and geomechanical field surveys defined that the CS ridge is affected by sets of fractures, joints and shear planes—mainly roughly NW–SE and N–S trending—that are related to the deformation zone of the Subequana valley fault system and to transfer faults linking northward the mentioned tectonic feature with the Middle Aterno Valley fault system. In particular, our investigations highlight that seismic amplifications occur where joints set NW–SE trending are open. On the other hand, no amplification is seen in portions of the ridge where the bedrock is densely fractured but no open joints occur. The fracture opening seems related to the toppling tendency of the bedrock slabs, owing to the local geomorphic setting. These investigations suggest that the detected amplification of the ground motion is probably related to the polarization of the seismic waves along the Castelvecchio Subequo ridge, with the consequent oscillation of the rock slabs perpendicularly to the fractures azimuth.

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Authors and Affiliations

  1. Centro Nazionale Terremoti Sede di Ancona, Istituto Nazionale di Geofisica e Vulcanologia, Strada Cameranense 1, 60131, Passo Varano, AN, Italy

    S. Marzorati & C. Ladina

  2. Sezione di Roma1, Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy

    E. Falcucci, S. Gori & F. Galadini

  3. Dipartimento di Meccanica, Strutture, Ambiente e Territorio, Università di Cassino, Cassino, Italy

    M. Saroli

  4. Sezione di Milano-Pavia, Istituto Nazionale di Geofisica e Vulcanologia, Milan, Italy

    G. Ameri

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  1. S. Marzorati
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  2. C. Ladina
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  3. E. Falcucci
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  4. S. Gori
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  6. G. Ameri
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Correspondence to S. Marzorati.

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Marzorati, S., Ladina, C., Falcucci, E. et al. Site effects “on the rock”: the case of Castelvecchio Subequo (L’Aquila, central Italy). Bull Earthquake Eng 9, 841–868 (2011). https://doi.org/10.1007/s10518-011-9263-5

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