NDLI: Frequency variation in site response as observed from strong motion data of the L’Aquila (2009) seismic sequence

Content Provider	Springer Nature Link
Author	Puglia, R. Ditommaso, R. Pacor, F. Mucciarelli, M. Luzi, L. Bianca, M.
Copyright Year	2011
Abstract	Previous works based mainly on strong-motion recordings of large Japanese earthquakes showed that site amplification and soil fundamental frequency could vary over long and short time scales. These phenomena were attributed to non-linear soil behaviour: the starting fundamental frequency and amplification were both instantaneously decreasing and then recovering for a time varying from few seconds to several months. The recent April 6, 2009 earthquake (M W 6.3), occurred in the L’Aquila district (central Italy), gave us the possibility to test hypotheses on time variation of amplification function and soil fundamental frequency, thanks to the recordings provided by a pre-existing strong-motion array and by a large number of temporary stations. We investigated the intra- and inter-event soil frequency variations through different spectral analyses, including time-frequency spectral ratios and S-Transform (Stockwell et al. in IEEE Trans Signal Process 44:998–1001, 1996). Finally, analyses on noise recordings were performed, in order to study the soil behaviour in linear conditions. The results provided puzzling evidences. Concerning the long time scale, little variation was observed at the permanent stations of the Aterno Valley array. As for the short time-scale variation, the evidence was often contrasting, with some station showing a time-varying behavior, while others did not change their frequency with respect to the one evaluated from noise measurements. Even when a time-varying fundamental frequency was observed, it was difficult to attribute it to a classical, softening non-linear behaviour. Even for the strongest recorded shocks, with peak ground acceleration reaching 0.7 g, variations in frequency and amplitude seems not relevant from building design standpoint. The only exception seems to be the site named AQV, where the analyses evidence a fundamental frequency of the soil shifting from 3 Hz to about 1.5 Hz during the mainshock.
Starting Page	869
Ending Page	892
Page Count	24
File Format	PDF
ISSN	1570761X
Journal	Bulletin of Earthquake Engineering
Volume Number	9
Issue Number	3
e-ISSN	15731456
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-04-19
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Strong motion Subsoil non-linearity Horizontal to vertical spectral ratio Standard spectral ratio 1D modeling S-Transform Geophysics/Geodesy Geotechnical Engineering Structural Geology Hydrogeology Civil Engineering
Content Type	Text
Resource Type	Article
Subject	Building and Construction Geophysics Geotechnical Engineering and Engineering Geology Civil and Structural Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Recorded ground motion and site effects evaluation for the April 6, 2009 L’Aquila earthquake

Peak and integral seismic parameters of L’Aquila 2009 ground motions: observed versus code provision values

The Aterno valley strong-motion array: seismic characterization and determination of subsoil model

Site effects of the Roio basin, L’Aquila

Performance of the Italian strong motion network during the 2009, L’Aquila seismic sequence (central Italy)

Far field damage on RC buildings: the case study of Navelli during the L’Aquila (Italy) seismic sequence, 2009

Site effects observed in alluvial basins: the case of Norcia (Central Italy)

The contribution of seismic data in microzonation studies for downtown L’Aquila

Predicted ground motion after the L’Aquila 2009 earthquake (Italy, M w 6.3): input spectra for seismic microzoning

Frequency variation in site response as observed from strong motion data of the L’Aquila (2009) seismic sequence

Similar Documents

Recorded ground motion and site effects evaluation for the April 6, 2009 L’Aquila earthquake

Peak and integral seismic parameters of L’Aquila 2009 ground motions: observed versus code provision values

The Aterno valley strong-motion array: seismic characterization and determination of subsoil model

Site effects of the Roio basin, L’Aquila

Performance of the Italian strong motion network during the 2009, L’Aquila seismic sequence (central Italy)

Far field damage on RC buildings: the case study of Navelli during the L’Aquila (Italy) seismic sequence, 2009

Site effects observed in alluvial basins: the case of Norcia (Central Italy)

The contribution of seismic data in microzonation studies for downtown L’Aquila

Predicted ground motion after the L’Aquila 2009 earthquake (Italy, M w 6.3): input spectra for seismic microzoning

Frequency variation in site response as observed from strong motion data of the L’Aquila (2009) seismic sequence