The first mainshock (Mw 6.0) of the 2016 Central Italy seismic sequence, severely struck the Amatrice village and the surrounding localities. After few days, some Italian Institutions, coordinated by the “Center for Seismic Microzonation and its applications”, carried out several preparatory activities for seismic microzonation of the area. A temporary seismic network was installed that monitored about 50 sites in epicentral area. The network produced a huge amount of records in a wide range of magnitude up to Mw 6.5. For about half of the recording stations, detailed site characterization was undertaken, encompassing single-station noise measurements and S-wave velocity profiles. The geological and geophysical data together with the collected dataset of seismic signals were exploited to investigate the site response of selected stations. Significant amplifications are found in correspondence of several sites that experienced high level of damage (Imcs >IX), mainly at short and intermediate periods.
Abstract We present horizontal ground motion predictions at a soft site in the Kumamoto alluvial plain for the Mj 5.9 and Mj 6.5 Kumamoto earthquakes of April 2016, in the framework of an international blind prediction exercise (http://www.esg6.jp/). Such predictions were obtained by leveraging all available information which included: i) analysis of earthquake ground motions, ii) processing of ambient vibration data (AMV) and iii) 1D ground response analysis. Spectral analysis of earthquake ground-motion data were used to obtain empirical estimates of the prediction site amplification function, with evidence of an amplification peak at about 1.2 Hz. Horizontal-to-vertical spectral ratio analysis of AMV confirmed this resonance frequency and pointed out also a low frequency resonance around 0.3 Hz at the prediction site. AMV were then processed by cross-correlation, modified spatial autocorrelation and high-resolution beamforming methods to retrieve the 1D shear-wave velocity (Vs) structure at the prediction site by joint inversion of surface-wave dispersion and ellipticity curves. The use of low frequency dispersion curve and ellipticity data allowed to retrieve a reference Vs profile down to few thousand meters depth which was then used to perform 1D equivalent-linear simulations of the M 5.9 event, and both equivalent-linear and nonlinear simulations of the M 6.5 event at the target site. Adopting quantitative goodness-of-fit metrics based on time-frequency representation of the signals, we obtained fair-to-good agreement between 1D predictions and observations for the Mj 6.5 earthquake and a poor agreement for the Mj 5.9 earthquake. In terms of acceleration response spectra, while ground-motion overpredictions were obtained for the Mj 5.9 event, simulated ground motions for the Mj 6.5 earthquake severely underestimate the observations, especially those obtained by the nonlinear approach.
Research Article| September 01, 2008 ITACA (ITalian ACcelerometric Archive): A Web Portal for the Dissemination of Italian Strong-motion Data Lucia Luzi; Lucia Luzi Istituto Nazionale di Geofisica e Vulcanologia via Bassini 15 20123 Milano, Italy luzi@mi.ingv.it (L.L.) Search for other works by this author on: GSW Google Scholar Salomon Hailemikael; Salomon Hailemikael Istituto Nazionale di Geofisica e Vulcanologia via Bassini 15 20123 Milano, Italy luzi@mi.ingv.it (L.L.) Search for other works by this author on: GSW Google Scholar Dino Bindi; Dino Bindi Istituto Nazionale di Geofisica e Vulcanologia via Bassini 15 20123 Milano, Italy luzi@mi.ingv.it (L.L.) Search for other works by this author on: GSW Google Scholar Francesca Pacor; Francesca Pacor Istituto Nazionale di Geofisica e Vulcanologia via Bassini 15 20123 Milano, Italy luzi@mi.ingv.it (L.L.) Search for other works by this author on: GSW Google Scholar Francesco Mele; Francesco Mele Istituto Nazionale di Geofisica e Vulcanologia via Bassini 15 20123 Milano, Italy luzi@mi.ingv.it (L.L.) Search for other works by this author on: GSW Google Scholar Fabio Sabetta Fabio Sabetta Istituto Nazionale di Geofisica e Vulcanologia via Bassini 15 20123 Milano, Italy luzi@mi.ingv.it (L.L.) Search for other works by this author on: GSW Google Scholar Seismological Research Letters (2008) 79 (5): 716–722. https://doi.org/10.1785/gssrl.79.5.716 Article history first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Lucia Luzi, Salomon Hailemikael, Dino Bindi, Francesca Pacor, Francesco Mele, Fabio Sabetta; ITACA (ITalian ACcelerometric Archive): A Web Portal for the Dissemination of Italian Strong-motion Data. Seismological Research Letters 2008;; 79 (5): 716–722. doi: https://doi.org/10.1785/gssrl.79.5.716 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietySeismological Research Letters Search Advanced Search The Italian strong-motion database contains 2,182 three-component waveforms generated by 1,004 earthquakes with a maximum magnitude of 6.9 (1980 Irpinia earthquake) for the period from 1972 to 2004. The database is devoted to serving the seismological and engineering communities and can be accessed online at http://itaca.mi.ingv.it, where a wide range of search tools enables the user to interactively search events and recording stations and retrieve waveforms with particular characteristics. The user can specify parameters through a graphical user interface (GUI). A range of display options allows users to view data in different contexts and to extract and download time... You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
