Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/2470
AuthorsOlsen, K. B.* 
Akinci, A.* 
Rovelli, A.* 
Marra, F.* 
Malagnini, L.* 
Title3D Ground-Motion Estimation in Rome, Italy
Issue Date2006
Series/Report no.1/ 96 (2006)
DOI10.1785/0120030243
URIhttp://hdl.handle.net/2122/2470
KeywordsGround-Motion
3-D
Subject Classification04. Solid Earth::04.06. Seismology::04.06.04. Ground motion 
AbstractPaleoseismic evidence and seismic-hazard analysis suggest that the city of Rome, Italy, has experienced considerable earthquake ground motion since its establishment more than 2000 years ago. Seismic hazards in Rome are mainly associated with two active seismogenic areas: the Alban Hills and the Central Apennines regions, located about 20 km southeast and 80–100 km east of central Rome. Within the twentieth century, M 6.8 and M 5.3 earthquakes in the Apennines and the Alban Hills, respectively, have generated intensities up to Mercalli-Cancani-Sieberg scale (MCS) VII in the city. With a lack of strong-motion records, we have generated a 3D velocity model for Rome, embedded in a 1D regional model, and estimated long-period ( 1 Hz) ground motions for such scenarios from finite-difference simulations of viscoelastic wave propagation. We find 1-Hz peak ground velocities (PGVs) and peak ground accelerations (PGAs) of up to 14 cm/sec and 44 cm/sec2, respectively, for a M 5.3 Alban Hills scenario, largest near the northwestern edge of the Tiber River. Our six simulations of a M 7.0 Central Apennine scenario generate 0.5-Hz PGVs in Rome of up to 9 cm/sec, as well as extended duration up to 60 sec. The peak motions are similar to, but the durations much longer than those from previous studies that omitted important wave-guide effects between the source and the city. The results from the two scenarios show that the strongest ground-motion amplification in Rome occurs in the Holocene alluvial areas, with strong basin edge effects in the Tiber River valley. Our results are in agreement with earlier 2D SHwave results showing amplification of peak velocities by up to a factor of 2 in the alluvial sediments, largest near the contact to the surrounding Plio-Pleistocene formations. Our results suggest that both earthquakes from the Alban Hills and the Central Apennines regions contribute to the seismic hazards in Rome. Although earthquakes from the former area may generate the larger peak motions, seismic waves from the latter region may generate ground motions with extended durations capable of causing significant damage on the built environment.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
1286.pdf952.58 kBAdobe PDFView/Open    Request a copy
Show full item record

Page view(s)

76
checked on May 23, 2017

Download(s)

25
checked on May 23, 2017

Google ScholarTM

Check

Altmetric