Probabilistic Seismic Hazard Assessment (PSHA) for Lesvos Island Using the Logic Tree Approach
Published:
Oct 18, 2019
Keywords:
Lesvos Island seismic hazard earthquake
Abstract
We carry out a probabilistic seismic hazard assessment (PSHA) for Lesvos Island, in the northeastern Aegean Sea. Being the most populated island in the northern Aegean Sea and hosting the capital of the prefecture, its seismic potential has significant social-economic meaning. For the seismic hazard estimation, the newest version of the R-CRISIS module, which has high efficiency and flexibility in model selection, is used. We incorporate into the calculations eight (8) ground motion prediction equations (GMPEs). The measures used are peak ground acceleration, (PGA), peak ground velocity, (PGV), and spectral acceleration, (SA), at T=0.2 sec representative of the building stock. We calculate hazard curves for selected sites on the island, sampling the southern and northern parts: Mytilene, the capital, the village of Vrisa, Mithymna and Sigri. Hazard maps are also presented in terms of all three intensity measures, for a mean return period of 475 years (or 10% probability of exceedance in 50 years), assuming a Poisson process. Our results are comparable to the predictions of on-going EU hazard models, but higher than the provisions of the Greek Seismic Code. Finally, we perform disaggregation of hazard to depict the relative contribution of different earthquake sources and magnitudes to the results.
Article Details
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Vavlas, N., Kiratzi, A., Margaris, B., & Karakaisis, G. (2019). Probabilistic Seismic Hazard Assessment (PSHA) for Lesvos Island Using the Logic Tree Approach. Bulletin of the Geological Society of Greece, 55(1), 109–136. https://doi.org/10.12681/bgsg.20705
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- Geophysics and Seismology
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