What immediate consequence was absent following the 1908 Tunguska event airburst?

A direct impact crater.

The Tunguska event, which occurred in 1908, serves as an example of a minor impact event, involving an object estimated to be between 10 and 20 meters in diameter. Objects of this size typically fragment high up in the atmosphere, resulting in an airburst. Although this airburst released an immense amount of energy, often compared to a large nuclear weapon, and caused widespread physical damage like flattening forests over a broad region, the fragmented nature of the object meant that it did not create a physical impact crater upon reaching the ground. Survival from such an event is localized, depending heavily on avoiding the immediate blast zone.