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NZ quakes, tsunami warnings


NZ quakes, tsunami warnings
Swell conditions normal in New Zealand. Credit: Benedict Adam/CCBY2.0
New Zealanders woke this morning to a series of earthquakes. The largest of them, an 8.1 magnitude quake centred near the Kermadec Islands, triggered a rush of tsunami warnings for both the east and west coasts in the country’s north.
The 8.1 quake occurred at a depth of 20km, relatively shallow for earthquakes, and conditions created could have caused a large tsunami. Fortunately, ocean conditions stayed calm.
“There are a number of complex criteria that have to come together to determine whether there will be significant tsunami, such as the speed of propagation, and whether material was displaced on the ocean floor,” said Tim Stern, a geophysicist at Victoria University, Wellington. ....

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Australia has lots of ancient volcanoes. But how did they form?


Australia has lots of ancient volcanoes. But how did they form?
MonMonday 28
updated
TueTuesday 29
Mount Ngungun, in the Glass House Mountains, is part of Australia s ancient volcanic past.
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If you are heading on a road trip this summer, you might drive past several ancient sentinels of Australia s volcanic past.
Many of them, like the Glass House Mountains, are hard to miss.
These ancient volcanic plugs are all that is left of eruptions that occurred around 25 million years ago.
They are among hundreds of ancient volcano remnants that extend 3,500 kilometres from Tasmania to northern Queensland.
While the Glass House Mountains stand out in the landscape, other remnants are just weathered nubs hidden in the bush or a series of caves hollowed out by lava. ....

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