据信可能是由于多种原因造成的，包括古岩浆流动和地下熔岩道的崩塌。
It is believed there may be many different formation mechanisms including ancient magma flows and the collapse of subterranean lava tubes.
据火山观测站所说，到周日为止，在火山口内，偶尔的岩石小瀑布——而不是岩浆流动——是火山还在活动的唯一迹象。
As of Sunday, occasional rock cascades were the only signs of activity-other than lava flows-within the crater, according to the volcano observatory.
为了使地震能引起火山爆发，在火热的山体地下的岩浆必须能够流动。
In order for earthquakes to set off a volcano, the magma reservoir beneath the fiery mountains must be already primed to blow.
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