RUPTURE IMAGING FOR THE 30 OCTOBER TSUNAMIGENIC EARTHQUAKE IN THE EASTERN AEGEAN SEA

• Published in: Science of tsunami hazards Vol. 40; no. 4; pp. 228 - 237
• Main Authors: Madlazim, Muhammad Nurul Fahmi, Arie Realita, Dyah Permata Sari
• Format: Journal Article
• Language: English
• Published: Tsunami Society International 01.12.2021
• Subjects: back projection; rupture imaging; rupture velocity; tsunami run-up
• ISSN: 8755-6839

On 30 October 2020, an earthquake with a moment magnitude Mw=7.0 occurred in the Aegean Sea close to the coasts of Turkey and of the Greek Island of Samos. The earthquake generated a local tsunami in the area, which had maximum amplitude of 2 meters, and inundation in certain coastal region of up to 155 times the run-up height. The present study provides a measure of the rupture dynamics of this tsunamigenic earthquake and provides the parameters of its rupture velocity, as well as the direction and length of the rupture by using beam forming and Multiple Signal Classification Back Projection (MUSICBP) techniques. In this present study we used 189 AK array stations and 153 European (EU) networks stations. The area of high frequency (HF) radiators extends almost bilaterally for more than 64 km along the rupture dynamics, with almost all ruptures having westward directivity. However, there was also an eastward rupture with high energy and low velocity. The timing of the HF radiators seen by both arrays were plotted against their epicenter distance slope 1 of the blue lines, which indicated rupture speeds of 1.9 km/s (slow), and the slope 2 of the yellow lines indicated very fast rupture speeds of 5 km/s, while the slope 3 of the purple lines indicated average rupture speeds of 3.3 km/s (regular).