It's unknown whether the lava is residual material that's draining through the underground tube system or if the flow is still being supplied by lava from the crater, scientists say.

科学工作者们说，不知道熔岩是否是地下管道系统排出的残留物质，或者是否火山口的熔岩仍然在提供流量。

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The signature at Eyjafjallajökull is a concentrated circle without a river of lava, supporting the Icelandic Coast Guard’s observation that lava had not started to flow from the volcano.

艾雅法拉火山的温度标识是一个没有岩浆的环形，这一点和冰岛海岸警卫队观察到的熔岩还未喷涌而出相一致。

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All types of volcanic cone, crater, lava platform, lava flow lakes and other volcanic landscape is very prominent, constitute a magnificent volcanic tourist landscape.

各种类型的火山锥、火山口、熔岩台地、熔岩流堰塞湖泊等火山地貌十分显目，构成壮丽的火山旅游景观。

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However, Tuesday's incident isn't considered an eruption because it resulted in no lava flow.

WSJ: Philippines Volcano Spews Ash, Kills 5

Jake was a consequence of those residual fluids, eventually solidifying just inside a Martian volcano or in a lava flow.

BBC: Cosmic coincidence on the road to Glenelg

But like a lava flow, casualties should be rare because the information and process is slow enough to allow escape.

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