TY - JOUR
T1 - The 2020 M w 7.0 Samos (Eastern Aegean Sea) Earthquake
T2 - joint source inversion of multitype data, and tsunami modelling
AU - Sun, Yu Sheng
AU - Melgar, Diego
AU - Ruiz-Angulo, Angel
AU - Ganas, Athanassios
AU - Taymaz, Tuncay
AU - Crowell, Brendan
AU - Xu, Xiaohua
AU - Tsironi, Varvara
AU - Karasante, Ilektra
AU - Yolsal- Çevikbilen, Seda
AU - Erman, Ceyhun
AU - Irmak, Tahir Serkan
AU - Çubuk-Sabuncu, Yeşim
AU - Eken, Tuna
N1 - Publisher Copyright:
© The Author(s) 2024.
PY - 2024/6/1
Y1 - 2024/6/1
N2 - We present a kinematic slip model and a simulation of the ensuing tsunami for the 2020 M w 7.0 Néon Karlovásion (Samos, Eastern Aegean Sea) earthquake, generated from a joint inversion of high-rate GNSS, strong ground motion and InSAR data. From the inversion, we find that the source time function has a total duration of ∼20 s with three peaks at ∼4, 7.5 and 15 s corresponding to the development of three asperities. Most of the slip occurs at the west of the hypocentre and ends at the northwest downdip edge. The peak slip is ∼3.3 m, and the inverted rake angles indicate predominantly normal faulting motion. Compared with previous studies, these slip patterns have essentially similar asperity location, rupture di- mension and anticorrelation with aftershocks. Consistent with our study, most published papers show the source duration of ∼20 s with three episodes of increased moment releases. For the ensuing tsunami, the eight available gauge records indicate that the tsunami waves last ∼18-30 hr depending on location, and the response period of tsunami is ∼10-35 min. The initial waves in the observed records and synthetic simulations show good agreement, which indirectly validates the performance of the inverted slip model. Ho wever , the synthetic wavefor ms str uggle to generate long-duration tsunami behaviour in simulations. Our tests suggest that the resolution of the bathymetry may be a potential factor affecting the simulated tsunami duration and amplitude. It should be noted that the maximum wave height in the records may occur after the decay of synthetic wave amplitudes. This implies that the inability to model long-duration tsunamis could result in underestimation in future tsunami hazard assessments.
AB - We present a kinematic slip model and a simulation of the ensuing tsunami for the 2020 M w 7.0 Néon Karlovásion (Samos, Eastern Aegean Sea) earthquake, generated from a joint inversion of high-rate GNSS, strong ground motion and InSAR data. From the inversion, we find that the source time function has a total duration of ∼20 s with three peaks at ∼4, 7.5 and 15 s corresponding to the development of three asperities. Most of the slip occurs at the west of the hypocentre and ends at the northwest downdip edge. The peak slip is ∼3.3 m, and the inverted rake angles indicate predominantly normal faulting motion. Compared with previous studies, these slip patterns have essentially similar asperity location, rupture di- mension and anticorrelation with aftershocks. Consistent with our study, most published papers show the source duration of ∼20 s with three episodes of increased moment releases. For the ensuing tsunami, the eight available gauge records indicate that the tsunami waves last ∼18-30 hr depending on location, and the response period of tsunami is ∼10-35 min. The initial waves in the observed records and synthetic simulations show good agreement, which indirectly validates the performance of the inverted slip model. Ho wever , the synthetic wavefor ms str uggle to generate long-duration tsunami behaviour in simulations. Our tests suggest that the resolution of the bathymetry may be a potential factor affecting the simulated tsunami duration and amplitude. It should be noted that the maximum wave height in the records may occur after the decay of synthetic wave amplitudes. This implies that the inability to model long-duration tsunamis could result in underestimation in future tsunami hazard assessments.
KW - Earthquake ground motions
KW - Earthquake source observations
KW - Joint inversion
KW - Transient deformation
KW - Tsunamis
UR - http://www.scopus.com/inward/record.url?scp=85190161671&partnerID=8YFLogxK
U2 - 10.1093/gji/ggae082
DO - 10.1093/gji/ggae082
M3 - Article
AN - SCOPUS:85190161671
SN - 0956-540X
VL - 237
SP - 1285
EP - 1300
JO - Geophysical Journal International
JF - Geophysical Journal International
IS - 3
ER -