Fears the huge volcano at Yellowstone National Park in the US could be building up for a huge eruption have been raised after a series of "earthquake swarms".
Temperature in thermal springs usually suitable for bathing in a volcanic area close to Yellowstone in Idaho also got so high that dogs who plunged in were killed and their owner who tried to rescue them was seriously burned.
Yellowstone is one of the ten biggest volcanoes in the world, and it is widely accepted if it erupted fully there would be catastrophic events across the planet.
The huge volcano has erupted every 600,000 to 700,000 years over the past two million years - with the last one 640,000 years ago - so it is also feared the next major eruption is due any time.
More minor eruptions that affect just the park occur every 20,000 years, but there has not been one for 70,000 years, so it is feared another blast is overdue.
If a full-scale eruption happened it would likely see a 50-mile wide explosion with ash clouds hurled 80,000-feet into the air.
The eruption would last up to two weeks and spread ash so far it would block out the sun to much of the globe, causing another ice age.
Michael Yuri Janitch, from St Louis, Missouri, who monitors global seismic activity under the user name Dutchsinse, placed a video online after learning the dogs were killed in an area of the national park in Idaho that had seen a spike in earthquake activity and forest fires, which he believes are connected to seismic activity and underground temperatures.
He said: "I bring this to you not to be scared but to be prepared just in case.
"The man and his two dogs were walking through the Salmon-Challis National Forest, 50 miles north west of Salmon, east-central Idaho, when the animals plunged into the water.
"It is normally temperate enough for humans to bathe in.
"This is the same spot as the swarm of earthquakes I pointed out at Challis, Idaho.
"Why is that happening? Why are the earthquakes happening? And the wildfires? They are all in volcanic areas.
"Now we've got someone who jumped into a hot spring and got boiled and is lucky to be alive and it all comes on the heels of the earthquake activity."
Local reports suggested a drought meant that cooler waters had not mixed with the spring to cool it down, but Mr Janitch was not convinced.
He added: "This is a sign of shallow heat coming from underneath. Is it a sign of an eruption?
"This is not just about water flow feed in and cool down, it immediately killed one dog as soon as it hit the water."
Mr Janitch subscribes to a well-known theory that the US government still carries out experiments on weather through a secretive programme called High Frequency Active Auroral Research Program (HAARP), which was supposed to have ceased in 2007.
But the National Geographic channel has also raised concerns of an imminent eruption, releasing just weeks ago a documentary looking at the current risk from the Yellowstone volcano.
The film's narrator on the video said it was a matter of when not if a super eruption would happen again.
He said: "How do we know it will happen, because it has happened before.
"As the research continues scientists realise how little they know about the Yellowstone volcano.
"Its ash cloud would overwhelm humanity across globe, so predicting an eruption could be matter of life and death.
"The impact would be on the scale of an asteroid impact."
Yellowstone also erupted 1.3million years ago and before that 2million years ago.
Scientists believe it has been having massive super eruptions for the past 16 million years.
In April this year scientists from the University of Utah revealed the amount of magma beneath Yellowstone and surrounding areas was much more prevalent than previously realised - with enough molten rock to fill the Grand Canyon 14 times.
Hsin-Hua Huang and colleagues at the university described it as "one of the planet's biggest time bombs."
After the last super eruption 640,000 years ago, before prehistoric man's arrival, global temperatures plunged by 3 to 5C, wiping out several special of animals who also succumbed to months of breathing in ash dust.
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