Kinematics of the 30 October 2020 Mw 7.0 Néon Karlovásion (Samos) earthquake in the Eastern Aegean Sea: Implications on source characteristics and dynamic rupture simulations

Taymaz，Tuncay1; Yolsal-Çevikbilen，Seda1; Irmak，T. Serkan2; Vera，Felipe3,4; Liu，Chengli5; Eken，Tuna1; Zhang，Zhenguo6; Erman，Ceyhun1; Keleş，Derya1

2022-03-05

10.1016/j.tecto.2022.229223

TECTONOPHYSICS   影响因子和分区

0040-1951

We resolve source mechanism and rupture process for the Néon Karlovásion, Samos Mw 7.0 earthquake that struck Greek-Turkish border regions on 30th October 2020 acquired from kinematic joint inversion of teleseismic body-waves and near-field strong ground-motion waveforms. The optimal kinematic finite-fault slip model indicates a planar E-W striking north-dipping normal faulting mechanism with strike ϕ = 270° ± 5°; dip δ = 35° ± 5°; rake λ = −94° ± 5°; centroid depth h = 11 ± 2 km; duration of the source time function STF = 26 s and seismic moment M = 3.34 × 10 Nm equivalent to Mw = 7.0. Our final finite- fault slip models exhibit two main asperities within a depth range from ~20 km to the surface. The dynamic rupture model exposes an initial heterogeneous stress distribution with variations up to 25 MPa. The near-field strong motion waveforms constrained the slip model suggesting up-dip and westward propagation of the bilateral rupture pattern with a maximum slip of 3.2 m, illuminated by back-projection (BP) analysis. The high-frequency (HF) back-projected rupture showed a predominantly E-W striking component (~75%) with directivity of 277° that propagates to the surface along a 60 km long and 24 km wide fault plane in 20 s at a slower speed range of 1.0–2.0 km/s. This well constrains the coseismic slip region where the aftershock sequence confirms distributed deformation. Our back-projection analyses elucidates a dominant HF rupture stage (0–13 s) tracked first on the epicentre area and further along the downdip in the region of maximum coseismic slip indicating ~15 km of persistent rupture. The latter HF emissions (13–20 s) remark a speed of about 3.0 km/s and a westward extension of the rupture up to 30 km from the preceding rupture segment to shorelines at the northeast of the Ikaria Island.

Body waves Computational seismology Dynamics and mechanics of faulting Earthquake source observations Numerical modelling Waveform inversion

SCI ; EI

英语

其他

National Natural Science Foundation of China[41922024];

WOS:000770879800002

20220811669286

Dynamics ; Earthquake effects ; Fault slips ; Neon

Earthquake Measurements and Analysis:484.1 ; Chemical Products Generally:804 ; Mechanics:931.1

GEOSCIENCES

2-s2.0-85124656568

Scopus

1.Department of Geophysical Engineering,The Faculty of Mines,Istanbul Technical University,Istanbul,Maslak, 34469 Sariyer,Turkey
2.Department of Geophysical Engineering,Kocaeli University,Kocaeli,41001 Izmit,Turkey
3.Helmholtz-Zentrum Potsdam,GFZ German Research Centre for Geosciences,Potsdam,Albert-Einstein-Straße,14473,Germany
4.Freie Universität Berlin,Berlin,Malteserstr. 74−100,12249,Germany
5.Department of Solid Earth Physics,Institute of Geophysics and Geomatics,China University of Geosciences,Wuhan,China
6.Department of Earth and Space Sciences,Southern University of Science and Technology Shenzhen,Guangdong,518055,China

Taymaz，Tuncay,Yolsal-Çevikbilen，Seda,Irmak，T. Serkan,et al. Kinematics of the 30 October 2020 Mw 7.0 Néon Karlovásion (Samos) earthquake in the Eastern Aegean Sea: Implications on source characteristics and dynamic rupture simulations[J]. TECTONOPHYSICS,2022,826.

Taymaz，Tuncay.,Yolsal-Çevikbilen，Seda.,Irmak，T. Serkan.,Vera，Felipe.,Liu，Chengli.,...&Keleş，Derya.(2022).Kinematics of the 30 October 2020 Mw 7.0 Néon Karlovásion (Samos) earthquake in the Eastern Aegean Sea: Implications on source characteristics and dynamic rupture simulations.TECTONOPHYSICS,826.

Taymaz，Tuncay,et al."Kinematics of the 30 October 2020 Mw 7.0 Néon Karlovásion (Samos) earthquake in the Eastern Aegean Sea: Implications on source characteristics and dynamic rupture simulations".TECTONOPHYSICS 826(2022).