Abstract
This paper describes the seismological analyses performed within the framework of the seismic microzonation study for the reconstruction of 138 municipalities damaged by the 2016–2017 sequence in Central Italy. Many waveforms were recorded over approximately 15 years at approximately 180 instrumented sites equipped with permanent or temporary stations in an area that includes all the damaged localities. Site response was assessed using earthquake and noise recordings at the selected stations through different parameters, such as spectral amplification curves, fundamental resonance frequencies, site-specific response spectra, and average amplification factors. The present study was a collaboration of many different institutions under the coordination of the Italian Center for Seismic Microzonation and its applications. The results were homogenized and gathered into site-specific forms, which represent the main deliverable for the benefit of Italian Civil Protection. It is remarkable that the bulk of this study was performed in a very short period (approximately 2 months) to provide quantitative information for detailed microzonation and future reconstruction of the damaged municipalities.
Highlights
Seismic microzonation (SM) is defined as “the assessment of local seismic hazards by identifying the zones of a given geographic area with homogeneous seismic behaviour
3.1.3 Dataset of earthquake recordings. Since both temporary networks operated during the ongoing seismic sequence, many earthquake recordings were available for the seismological analysis and site response assessment, especially at short epicentral distance (< 30 km, Fig. 3a, c)
We described the seismological analyses performed for the seismic microzonation study for reconstruction of the 138 municipalities damaged by the 2016–2017 seismic sequence in Central Italy
Summary
Seismic microzonation (SM) is defined as “the assessment of local seismic hazards by identifying the zones of a given geographic area with homogeneous seismic behaviour. Microzonation studies have the purpose of “rationalising the knowledge of these phenomena and of providing useful data to those in charge of planning or implementing projects in a given geographic area” (SM Working Group 2015) They are usually carried out within the framework of mid-term plans focused on seismic risk reduction and are commissioned by the regional administrations in Italy. We treat the two main phases of work separately, i.e., the intervention in the 4 municipalities of the epicentral area of the Amatrice earthquake during the emergency phase carried out through temporary seismic networks (Phase 1) and that performed for the 134 damaged municipalities in the post-emergency period using all the available seismological data (Phase 2). Just to provide some examples of what has been obtained, we summarize some significant outcomes of the two phases below
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