There are two strewnfield formation mechanisms:
- Mid-air fragmentation: when a large meteoroid enters the atmosphere, it often fragments into many pieces before touching the ground, due to thermal shock. This mid-air explosion disperses the material over a large oval-shaped area. The long axis of this oval is along the flight path of the meteoroid. When multiple explosions occur, the material can be found in several overlapping ovals.
- Impact fragmentation: when there is almost no mid-air fragmentation, the fragmentation can occur upon impact. In this case, the strewnfield shape can be different, usually circular. (e.g. Canyon Diablo at Meteor Crater; Australasian strewnfield)
In the case of mid-air fragmentation, smaller fragments tend to fall shorter. That is why the biggest fragment is usually found at one end of the oval. In order to get an idea of the original flight direction, it is necessary to analyze the size pattern of the material over the strewnfield. Fragments of about 1 to 5 grams can be picked up on weather radar, as they fall at terminal velocity.