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Measuring Afterslip From the February 2023 Mw 7.8 Pazarcık Earthquake Using Optical Images and Radar Data

Description: 

The East Anatolian fault, a major plate boundary transform fault in southern Türkiye, has hosted many large earthquakes - most recently the 2020 Mw 6.8 Elazığ earthquake and the 2023 Mw 7.8 Pazarcık earthquake of the 6 February 2023 Kahramanmaraş earthquake doublet. Previous studies suggest a ~40 km long potentially locked section of the longer Pütürge fault segment. This region north of the 2023 rupture and south of the 2020 rupture did not exhibit surface rupture from either earthquake. Whether this area is at risk of an earthquake or if afterslip can fully account for missing displacement in the region remains an open question. We explore this question with remote sensing methods. Using Sentinel-2 and Planet optical images, we calculate coseismic displacement profiles across the northern Pazarcık rupture, which ruptured 45 km of the 95 km Pütürge segment. We investigate afterslip from the 2023 Pazarcık earthquake using Sentinel-1 interferograms in the region between the 2020 and 2023 ruptures. Our work aims to quantify surface displacement and distribution along the northern Pütürge section; image the Pütürge section to understand its seismic potential; and better constrain the interactions of multiple large earthquakes along a plate boundary fault.

Session: Illuminating Complex, Multiplet Earthquake Sequences at Kahramanmaras (Turkiye), Herat (Afghanistan), and Beyond [Poster Session]

Type: Poster

Date: 5/2/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Madeleine

Student Presenter: No

Invited Presentation: 

Authors