The inferences on the Aegean geodynamic context from 30 October 2020 Samos earthquake (Mw:6.8)
| Autor: | Süha Özden, Semir Över, Alper Demirci, Erdem Gündoğdu |
|---|---|
| Přispěvatelé: | Mühendislik ve Doğa Bilimleri Fakültesi -- İnşaat Mühendisliği Bölümü, Över, Semir |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Geochemistry & Geophysics
Static stress changes Aegean islands North anatolian fault Turkey Seismic waves Moment tensor Magnitude (mathematics) Focal mechanisms Extensional stress African Plate Buyuk menderes graben Extension Focal mechanism Samos Fault plane solutions Western Anatolia Blueschist Aftershock Moment tensors Slip distribution Active tectonics Greece Earthquake magnitude Earthquake event Northern Aegean Geophysics Source parameters Geology Seismology Earthquake Inversion (geology) Context (language use) Slip (materials science) Southwestern anatolia Stress (mechanics) Samos Island African plate Kuşadası Gulf P-wave Mediterranean Sea Cyclades Anatolia Hellenic trench Earth-Surface Processes Normal fault Coulomb failure stress Fault slips Alpine-himalayan belt Tri-axial stress state Fault plane Substantial reduction |
| Popis: | On October 30, 2020, an earthquake with a magnitude of 6.8 (Mw) struck the northern coast of Samos Island in the Kusadast Gulf. The solution to the focal mechanism indicates that the earthquake of 30 October 2020 occurred on a normal fault with nodal planes of E-W strike; thus, indicating extension in N-S direction. The fault plane solutions show a N-S trending extension for normal faults, which are obtained by inverting the moment tensor waveforms of 23 earthquakes and the P-wave first motion polarities of 11 aftershocks. A normal fault stress regime of approximately N-S (N6 degrees E) sigma 3 axis is given by the inversion of slip vectors measured at sites located on land in Kuxadast. The mean R value is 0.84, suggesting that the stress regime is triaxial extensional stress state. The inversion of the focal mechanism of earthquakes occurring on land and in the Gulf of Kusadast describes an extensional stress regime active today, characterized by an approximately N-S (N9 degrees E) sigma 3 axis. The calculated R value of 0.31 indicates a triaxial stress state. For the 30 October 2020 earthquake (Mw:6.8), the Coulomb failure stress change analysis shows a substantial reduction in stress in the N-S direction supporting the kinematic results. The N-S extension in Western Anatolia-Aegean is largely influenced by the relatively fast movement of the Hellenic trench southwards, related to the sinking of the African plate beneath Aegean. |
| Databáze: | OpenAIRE |
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