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ISPRS Int. J. Geo-Inf. 2018, 7(7), 244; https://doi.org/10.3390/ijgi7070244

Shaking Maps Based on Cumulative Absolute Velocity and Arias Intensity: The Cases of the Two Strongest Earthquakes of the 2016–2017 Central Italy Seismic Sequence

Osservatorio Nazionale Terremoti, Istituto Nazionale di Geofisica e Vulcanologia, Rende 87036, Italy
Received: 29 March 2018 / Revised: 4 June 2018 / Accepted: 13 June 2018 / Published: 22 June 2018
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Abstract

By referring to the two strongest earthquakes of the 2016–2017 Central Italy seismic sequence, this paper presents a procedure to make shaking maps through empirical relationships between macroseismic intensity and ground-motion parameters. Hundreds of waveforms were processed to obtain instrumental ground-motion features which could be correlated with the potential damage intensities. To take into account peak value, frequency, duration, and energy content, which all contribute to damage, cumulative absolute velocity and Arias intensity were used to quantify the features of the ground motion. Once these parameters had been calculated at the recording sites, they were interpolated through geostatistical techniques on the whole struck area. Finally, empirical relationships were used for mapping intensities, i.e., potential effects on the built environment. The results referred to both earthquake scenarios that were analyzed and were also used for assessing the influence of the spatial coverage of the instrumental network. In fact, after the first events, the Italian seismic network was subjected to the addition and thickening of sensors in the epicentral area, especially. The results obtained by models only dependent on ground-motion parameters or even on the epicentral distance were compared with the official ShakeMaps and the observed intensities for assessing their reliability. Finally, some suggestions are proposed to improve the procedure that could be used for rapidly assessing ground shaking and mapping damage potential producing useful information for non-expert audience. View Full-Text
Keywords: 2016–2017 Central Italy seismic sequence; shaking map; geostatistical techniques; macroseismic intensity; cumulative absolute velocity; Arias intensity; damage potential mapping 2016–2017 Central Italy seismic sequence; shaking map; geostatistical techniques; macroseismic intensity; cumulative absolute velocity; Arias intensity; damage potential mapping
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Costanzo, A. Shaking Maps Based on Cumulative Absolute Velocity and Arias Intensity: The Cases of the Two Strongest Earthquakes of the 2016–2017 Central Italy Seismic Sequence. ISPRS Int. J. Geo-Inf. 2018, 7, 244.

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