6 February 2023 M 7.8 Marash/Antep (Kehramanmarash) Earthquake, Preliminary Satellite-Based Comprehensive Damage Assessment Report

✦ DISCOVERED BY ORIONAIUnited Nations Satellite Centre (UNOSAT)GeoscienceSyrian Arab Republic
Syrian Arab Republic

About this dataset

**UNOSAT code EQ20230206SYR, GDACS Id: 1357372** This report provides satellite-based comprehensive damage assessment results over Syria following the 06th of February 2023 Marash/Antep earthquakes sequence which struck southern Türkiye and north-western parts of Syria. The mainshock measured a magnitude of 7.8 and occurred at a crucial moment, 4:15 am local time, when most people were at home sleeping. It was a shallow depth earthquake with an epicentre located about 35 km north-west of the Turkish city of Gaziantep. These earthquakes caused more than 46,000 deaths in Türkyie and over 4,500 in northwest Syria. The humanitarian community estimated that 8.8 million people live in the most affected areas in Syria. Overall, 170 sub-districts in 43 districts in 10 of Syria’s governorates have been impacted by the earthquake. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to United Nations Satellite Centre (UNOSAT).

Documentation

UNOSAT datasets and maps are produced using a variety of methods. In general, analysts closely review satellite imagery, often comparing two or more images together, and determine notable changes between the images. For damage assessments, refugee or IDP assessments, and similar analyses, these changes are then manually documented in the vector data by the analyst. For flood extractions, landcover mapping and similar analyses, a variety of automated remote sensing techniques are used to extract the relevant information which is then reviewed and revised as necessary by the analyst. In all cases, resulting data is then loaded into a standardized UNOSAT geodatabase and exported asshapefiles for dissemination. This is a preliminary assessment and has not yet been validated in the field. It is important to consider the characteristics of the source imagery used in the analyses when interpreting results. For damage assessments it should be noted that only significant damage to the structural integrity of the buildings analyzed can be seen in imagery, while minor damage such as cracks or holes may not be visible at all. For flood extractions using radar data it is important to note that urban areas and highly vegetated areas may mask the flood signature and result in underestimation of flood waters. Users with specific questions or concerns should contact unosat@unitar.org to seek clarification.

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