At sites such as Loki Patera, this can occur episodically. During an overturning episode, Loki can emit up to ten times more heat than when its crust is stable. [2] During an eruption, a wave of foundering crust spreads out across the patera at the rate of about 1 kilometre (0.6 mi) per day, until the crust of the lake has been resurfaced.