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Predictive performance of current ground motion models for recorded strong motions in 2020 Samos Earthquake
https://orcid.org/0000-0003-1703-5026
https://orcid.org/0000-0002-9773-3440
https://orcid.org/0000-0003-4827-9058
https://orcid.org/0000-0002-0242-1402
Abstract The 2020 M7.0 Samos earthquake had occurred on the north of Samos Island; however, structural damage was observed in İzmir-Bayraklı, which is located approximately 65 km away from the epicenter. Strong ground motions recorded in İzmir Bay showed unique site amplifications, mostly due to the interaction between the basin and deep alluvial deposit response. The objective of this study is to evaluate the predictive performance of current ground motion models (GMMs) for estimating the recorded strong motions, especially the recordings over or near the Bayraklı-Bornova basin. 66 strong motion stations from Turkey with rupture distance (RRUP) < 200 km are used in the residual analysis, considering the ambiguities in the magnitude and depth to the top of the rupture estimations. Event terms of the earthquake for tested GMMs are found to be small and lie within the expected scatter, except for T = 0.5–1.5 s spectral accelerations. Event-specific distance attenuation for RRUP<100 km is consistent with the median predictions of current GMMs; however, the distance scaling for 100 kmRUP<200 km are significantly different at high frequencies, indicating faster attenuation for Southwestern Anatolia. Relatively long period (0.5–1.5 s) spectral energy is present in both soft sites on the Bayraklı-Bornova basin and rock/stiff-soil sites on the basin edge and these stations contribute significantly to the positive event terms at T = 0.5–1.5 s. For sites within the basin or close to the basin edge, factors such as the direction of the rupture front, basin width and depth, and the seismic structure of the basin contribute to the ground motion variability.
Highlights The structural damage from 2020 Samos Eq. was observed in İzmir-Bayraklı, which is located 65 km away from the epicentre. The event terms of the earthquake are found to be small, except for T=1 sec, based on the analysis of 66 stations from AFAD. Distance scaling at high frequencies indicates faster attenuation when compared to current GMMs for large distances. Mid-period (0.5-1.5 sec) spectral energy is present in soft sites over the İzmir basin and rock sites on the basin edge. For sites within the basin or close to the basin edge, the variability in recorded ground motions is significant.
Predictive performance of current ground motion models for recorded strong motions in 2020 Samos Earthquake
https://orcid.org/0000-0003-1703-5026
https://orcid.org/0000-0002-9773-3440
https://orcid.org/0000-0003-4827-9058
https://orcid.org/0000-0002-0242-1402
Abstract The 2020 M7.0 Samos earthquake had occurred on the north of Samos Island; however, structural damage was observed in İzmir-Bayraklı, which is located approximately 65 km away from the epicenter. Strong ground motions recorded in İzmir Bay showed unique site amplifications, mostly due to the interaction between the basin and deep alluvial deposit response. The objective of this study is to evaluate the predictive performance of current ground motion models (GMMs) for estimating the recorded strong motions, especially the recordings over or near the Bayraklı-Bornova basin. 66 strong motion stations from Turkey with rupture distance (RRUP) < 200 km are used in the residual analysis, considering the ambiguities in the magnitude and depth to the top of the rupture estimations. Event terms of the earthquake for tested GMMs are found to be small and lie within the expected scatter, except for T = 0.5–1.5 s spectral accelerations. Event-specific distance attenuation for RRUP<100 km is consistent with the median predictions of current GMMs; however, the distance scaling for 100 kmRUP<200 km are significantly different at high frequencies, indicating faster attenuation for Southwestern Anatolia. Relatively long period (0.5–1.5 s) spectral energy is present in both soft sites on the Bayraklı-Bornova basin and rock/stiff-soil sites on the basin edge and these stations contribute significantly to the positive event terms at T = 0.5–1.5 s. For sites within the basin or close to the basin edge, factors such as the direction of the rupture front, basin width and depth, and the seismic structure of the basin contribute to the ground motion variability.
Highlights The structural damage from 2020 Samos Eq. was observed in İzmir-Bayraklı, which is located 65 km away from the epicentre. The event terms of the earthquake are found to be small, except for T=1 sec, based on the analysis of 66 stations from AFAD. Distance scaling at high frequencies indicates faster attenuation when compared to current GMMs for large distances. Mid-period (0.5-1.5 sec) spectral energy is present in soft sites over the İzmir basin and rock sites on the basin edge. For sites within the basin or close to the basin edge, the variability in recorded ground motions is significant.
Predictive performance of current ground motion models for recorded strong motions in 2020 Samos Earthquake
https://orcid.org/0000-0003-1703-5026
https://orcid.org/0000-0002-9773-3440
https://orcid.org/0000-0003-4827-9058
https://orcid.org/0000-0002-0242-1402
Abstract The 2020 M7.0 Samos earthquake had occurred on the north of Samos Island; however, structural damage was observed in İzmir-Bayraklı, which is located approximately 65 km away from the epicenter. Strong ground motions recorded in İzmir Bay showed unique site amplifications, mostly due to the interaction between the basin and deep alluvial deposit response. The objective of this study is to evaluate the predictive performance of current ground motion models (GMMs) for estimating the recorded strong motions, especially the recordings over or near the Bayraklı-Bornova basin. 66 strong motion stations from Turkey with rupture distance (RRUP) < 200 km are used in the residual analysis, considering the ambiguities in the magnitude and depth to the top of the rupture estimations. Event terms of the earthquake for tested GMMs are found to be small and lie within the expected scatter, except for T = 0.5–1.5 s spectral accelerations. Event-specific distance attenuation for RRUP<100 km is consistent with the median predictions of current GMMs; however, the distance scaling for 100 kmRUP<200 km are significantly different at high frequencies, indicating faster attenuation for Southwestern Anatolia. Relatively long period (0.5–1.5 s) spectral energy is present in both soft sites on the Bayraklı-Bornova basin and rock/stiff-soil sites on the basin edge and these stations contribute significantly to the positive event terms at T = 0.5–1.5 s. For sites within the basin or close to the basin edge, factors such as the direction of the rupture front, basin width and depth, and the seismic structure of the basin contribute to the ground motion variability.
Highlights The structural damage from 2020 Samos Eq. was observed in İzmir-Bayraklı, which is located 65 km away from the epicentre. The event terms of the earthquake are found to be small, except for T=1 sec, based on the analysis of 66 stations from AFAD. Distance scaling at high frequencies indicates faster attenuation when compared to current GMMs for large distances. Mid-period (0.5-1.5 sec) spectral energy is present in soft sites over the İzmir basin and rock sites on the basin edge. For sites within the basin or close to the basin edge, the variability in recorded ground motions is significant.
Predictive performance of current ground motion models for recorded strong motions in 2020 Samos Earthquake
Gülerce, Zeynep (author) / Akbaş, Burak (author) / Özacar, A. Arda (author) / Sopacı, Eyüp (author) / Önder, Fatih M. (author) / Uzel, Bora (author) / Can, Gizem (author) / Cakir, Elife (author) / Ilgaç, Makbule (author) / Söylemez, Berkan (author)
2021-10-30
Article (Journal)
Electronic Resource
English
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