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Effects of the M6.1 Düzce (Türkiye) earthquake of November 23, 2022 and Seismic Hazard Implications

Description: 

On November 23, 2022, a M6.1 earthquake occurred (23.01:08:15, UTC; 10.0 km depth at 40.8175° N and 30.9868° E) on a right-lateral fault near Düzce, Türkiye (USGS). Local institutions measured the event as M6.0 (AFAD-Government of Türkiye Preliminary Report dated 23 November 2022) and M5.9 ( Kandilli Observatory). The event occurred in a small seismic gap between historic ruptures on the well-known North Anatolian Fault (NAF), which is similar to the San Andreas Fault (SAF) in California. Both faults are right-lateral, have similar slip rates (20-25 mm/year) and exhibit “jumping” of fault segments at stepovers during rupture. Because of these similarities, seismologists and geologists in United States have been keenly interested in the active NAF system. In 1999, two major earthquakes occurred on NAF that affected the current area and wider areas of the Marmara Sea region. Numerous structures collapsed or suffered significant damage in the region during the 1999 earthquake. A base-isolated highway viaduct connecting the vital Bolu Mountain highway tunnel immediately south of Düzce suffered significant damage to specific base-isolation units and were later replaced. Liquefaction resulted in catastrophic damage to several mid-rise apartment buildings in the City of Adapazari (west of Düzce). Aspects of the 1999 event are documented in U.S. Geological Survey Circular 1193 (https://pubs.usgs.gov/circ/2000/c1193/). We suggest that the recent event (a) likely increased stress on the western NAF in the area of Marmara Sea, and (b) increased the seismic risk to highly populated areas (e.g. Istanbul and vicinity). Positive aspects of the 2022 earthquake are that none of the government-financed condominium buildings constructed following the 1999 events collapsed, indicating that building codes were sufficient where properly applied, and there were no deaths due to the event.

Session: Advances in Probabilistic Seismic Hazard Analysis and Applications [Poster]

Type: Poster

Date: 4/20/2023

Presentation Time: 08:00 AM (local time)

Presenting Author: Mehmet Celebi

Student Presenter: No

Invited Presentation: 

Authors