NHERI

Recon report on the M7 Samos Island (Aegean Sea) Earthquake, October 30, 2020

Published on January 28, 2021

 

Effective disaster reconnaissance in a pandemic-stricken world

Collapsed structures in Bayrakli district of Izmir, Turkey (top). Rescue of child from collapsed structure in Izmir (bottom). Images courtesy GEER.

The Samos Island (Aegean Sea) earthquake struck at 13:51/14:51 local time in Greece and Turkey, respectively, on 30 October 2020. It produced wide-ranging effects including tsunami run-up, ground shaking with local zones of high intensity that led to the collapse of structures and 118 fatalities in both countries, and various geotechnical effects including liquefaction, rockfalls, and landsliding.

Because the earthquake occurred during the global COVID-19 pandemic, reconnaissance teams were forced to make a different response than would be typical for an earthquake of this size. With global travel restricted, international agencies did not send reconnaissance teams to the region.

However, in Greece, the Hellenic Association of Earthquake Engineering (HAEE/ETAM) mobilized a 12-member team to Samos Island and neighboring islands in two successive missions. Similarly, the Earthquake Engineering Association of Turkey and the Earthquake Foundation of Turkey (EEAT/EFT) mobilized teams to affected regions of the Aegean coast. These teams focused on the severely impacted city of Izmir.

While these reconnaissance missions were underway, discussions began between HAEE/ETAM and EEAT/EFT, which was facilitated and encouraged by two US-based international organizations: the Earthquake Engineering Research Institute, EERI, and the Geotechnical Extreme Events Reconnaissance Association, GEER.

Jonathan Stewart, a professor of earthquake and geotechnical engineering at UCLA, helped organize consultations between the groups. “It became evident that this significant event could only be understood in depth by mobilizing scientists on both sides of the fault, while integrating data and interpreting field evidence collectively,” he says.

Ultimately, Stewart says, the teams decided to pool resources and publish a combined report (PDF) that represents the collaborative effort between Greece, Turkey, and the USA to improve understanding of the event by collectively integrating data and interpreting field evidence. Stewart, a co-PI of GEER and on the board of directors for EERI, coordinated the report preparation in collaboration with Onder Cetin of Middle East Technical University (Turkey), and George Mylonakis and Anastasios Sextos of the University of Bristol (UK).

GEER published this report with funding from NSF; it was also later published by EERI’s Learning from Earthquakes program with funding from FEMA. The report, along with many more resources, is available on EERI’s Learning from Earthquakes website. The report is also available from the GEER website.

To share its findings and methodologies, the team is holding a half-day webinar on Saturday, January 30, from 6:00am-1:00pm EST. Register and find details here. This in-depth session will be recorded and made available for future viewing.

This unprecedented effort to collect valuable perishable data during a world-wide pandemic provides a model for future reconnaissance efforts.