火山溶岩地道 Hat Creek Subway Cave, CA

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2013 北美西部行腳之五 :  帽子溪火山溶岩地道                                                                  2013 Westbound 5 : Hat Creek Subway Cave

根據美國農業部資料: [二萬年前, 拉森火山帽子溪附近地面裂隙流出大量溶岩。溶岩在流動的過程中, 上層暴露於空氣的溶岩開始冷却和凝結,而下層灼熱的溶岩繼續向前流動。最後, 灼熱的溶岩流走了, 下面就變成中空的地道。現在的出入口其實是部份地道天花塌陷而成的。]   地道內並無照明, 必須帶備手電筒或頭燈。地道並不深, 但內進不久即覺寒氣襲人, 宜带備薄衣一件。未知何故(也許太黑了), 相機”暗中”對照並不理想, 要拍照的話, 宜慢動作, 讓相機有足夠時間對焦。由於Lassen 火山公園降雪量大, 火山溶岩地道每年只在五月至十月開放。

US Agriculture Department info:   [Geology – Less than 20,000 years ago the lava of the Hat Creek flow was discharged in Large volumes from a series of north-south fissures (cracks in the earth). This river of lava located near the town of Old Station, crawled northward 16 miles, covering the floor of Hat Creek Valley. While the top crust cooled and hardened, rivers of red-hot lava insulated by newly formed rock above, continued to flow. Eventually, the lava drained away, leaving tube-like caves, the entrance to cave formed by a partial collapse of the cave’s roof many years ago. Subway Cave is the largest accessible tube in the flow.]

Subway

農業部的資料, 顯示地道的位置和內裡構造。USDA info: Map shows the location of Subway cave and the diagram shows the trail inside the cave.

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火山溶岩地道入口。 Entrance to the Subway Cave.

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入口樓梯旁長的漂亮植物。 This beautiful plant was growing next to the stairway.

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入口處地道一段。The Stubtoe Hall near the entrance.

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再入內則漆黑一片。There were no illuminations inside the cave.

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這是露西花掘頭巷(窮巷)。This is Lucifer’s Cul-de-Sac, a side chamber, lighted by my headlight.

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好黑呢! It was really dark inside the side chamber.

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“密室”(Sanctum), 是地道最大的部份, 有20呎濶。The Sanctum is where lava flow widened and created a larger chamber in the cave.

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“密室”。The Santrum. The ceiling appears to be lower in some areas.

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此處天花有些向下突起, 是溶岩柱(lavacicle), 即類似冰柱形戍的小柱。Up on the ceiling, there are some some projections, I am not sure if these are what is known as lavacicle.

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快到出口處, 地道的形狀有些改变。Toward to the exit of the cave, the shape of the subway has changed a bit.

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天花下塌的石塊。Collapsed rabble.

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出口。The exit of the Subway Cave.

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出口處回望。Looking back from the exit.

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出口處回望。Looking back from the other side of the exit.

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出口。The exit.

上到地面後, 沿着小徑往回走, 可返回入口處。其實地上又熱又曬, 應該從地道走回去更佳, 笨!

After exiting the cave, we followed a trail on the ground back to the entrance. However, the dazzling sun was hot! We should have walked back to the entrance inside the subway !!

USDA info

USDA guide

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This entry was posted in California 加州, National Park 郊野公園, Travel 旅遊, Volcano 火山 and tagged , , , , , . Bookmark the permalink.

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