A proposed workflow to characterise site conditions and reference potential for Greek AdriaArray stations
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Abstract
In Greece, the 1Y AdriaArray network consists of 31 stations, covering most of the mainland. Although all of them are considered to lie on rock formations, the validity of the reference station assumption has not been verified yet – and neither has it been investigated throughout the rest of the extensive AdriaArray network. In this study, we attempt a systematic compilation of station metadata and site conditions for Greek 1Y stations, coupled with an in‑depth empirical analysis of weak‑ and strong‑motion recordings to estimate site effects. We wish to propose this as a basis for a structured workflow for documenting station and site conditions information across AdriaArray in a consistent and comprehensive way that can be harmonized across all agencies and countries. We have integrated waveform‑derived parameters, focusing on site response and near‑surface properties and parameters based on the analysis of external sources, such as geological maps, topographic maps, etc. Single‑station amplification functions (horizontal‑to‑vertical spectral ratios, HVSR) were estimated from the seismic data, and the site resonance characteristics were
assessed, not only in the conventional way of combining components, but also assessing directional sensitivity. Based on the various criteria investigated, we characterize stations with respect to their potential capacity as reference.
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