Ash from Crater Lake volcanic eruption – Video

Oregon’s Mount Mazama erupted violently some 7,700 years ago, leaving an impressive crater (Crater Lake) where the mountain once rose high into the sky.

A blanket of volcanic ash from the eruption has become a well-known time marker for geologists throughout the Pacific Northwest.

This 3-minute video features a site right next to heavily-traveled Interstate 90 in central Washington in Johnson Canyon where the famous ash is exposed.

That’s 300 miles away from Crater Lake!

The Mount Mazama ash traveled much farther than that; far north into Canada, south into California, and east into Idaho, Wyoming, Montana, Utah, and Nevada.

The Mazama ash also traveled west, and is found on the floor of the Pacific Ocean.

Tom Foster ( and Nick Zentner have been hiking together in eastern Washington for years. ‘Mazama Ash’ is part of an “I-90 Rocks” geology video series.

Nick Zentner is the science outreach and education coordinator for the Department of Geological Sciences at Central Washington University. He has produced more than 40 short videos about Central Washington geology.

This video was originally published on Dec 15, 2014.

7 thoughts on “Ash from Crater Lake volcanic eruption – Video”

  1. After +30°C, frosts returned to Siberia to -20°C.
    In the north of Siberia, -20°C night frosts continue. The minimum temperature to -17 …- 20°C is recorded at night in the Yamalo-Nenets and Dolgano-Nenets districts.
    In the second half of May night frosts returned to the Omsk, Novosibirsk, Kemerovo regions, to the south of the Krasnoyarsk Territory and to the Altai Territory. In the Tomsk region, the temperature dropped to -8°C.
    After a long period of very warm weather, Siberia became the coldest region in Russia.

  2. In Africa, snow fell (photo) 05/18/2017
    In Zambia, the capital Lusaka and nearby cities were covered with snow, and the air temperature in the African country fell sharply to 12 degrees Celsius.
    This is reported by the “Observer” with reference to AfricaNews.
    According to the publication, the capital of Zambia fell asleep with a small hail, which fell after a heavy rainfall.
    The weather forecasters explain that snow in the south of Africa sometimes falls out when the temperature reaches record lows.
    Local residents began to post photos on social networks.

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