Giant hole in Siberia. Methane (natural gas) explosion?

Scientists investigating the hole formed overnight in Siberia conclude it is an explosion of underground methane like a cork of wine bottles.
As seen in hi-res photos, there are vertical scratch marks along the wall.
The scratches continue near the surface edge of the hole spreading outward, showing an outward explosion rather than impact scatter mark from -for example- meteors.
The black colour, they said, indicates large fire took place.
Wonder if any imaging satellite caught this, even remotely in the horizon would still showed this "large explosion (s?)"
The ground is said to consist of 80% ice. a lake is found at the base of the crater.
The region is known as Russia's larger gas field.
(dailymail.co.uk)