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It's a little too quiet in California, seismically speaking.
The state is experiencing a century-long lull in large, ground-rupturing earthquakes, temblors that actually offset the earth at the surface. The 7.9-magnitude Great San Francisco Earthquake of 1906 was a ground-rupturing quake; photographs taken in its aftermath show roads and fences with new bends and twists.
Now, new research finds that this 100-year earthquake gap is very unlikely to be a statistical fluke. Instead, something geological is probably causing the peaceful period.
"We're unusually quiet," said study co-author Glenn Biasi, a geophysicist at the U.S. Geological Survey (USGS) in Pasadena, California. "The biggest faults and the faults carrying most of the slip have not ponied up." [Images: Rare Footage of the Devastation of the 1906 San Francisco Earthquake]
Mount Aso, one of the most active volcanoes in Japan, recently helped to stop a powerful earthquake before it subsided on its own, researchers discovered.
When a 7.1-magnitude quake struck Kumamoto, Japan, on April 16, 2016, it opened surface ruptures in a zone extending 25 miles (40 kilometers) in length. But scientists found evidence suggesting that the powerful earthquake was halted by a magma chamber under the Aso volcanic cluster, located 19 miles (30 km) from where the quake originated.
A mud island that burst from the waters off the coast of Pakistan during a deadly earthquake in 2013 has disappeared beneath the waves.
The 6-year-old island was the product of a "mud volcano," as Live Science reported at the time. Buried mud, subject to the intense pressures of the Arabian tectonic plate grinding against the Eurasian plate, liquefied and launched toward the surface. It moved so fast that it carried rocks and boulders on top of it. Those rocks ended up on the surface of the newly formed island, which was 65 feet high, 295 feet wide and 130 feet long (20 by 90 by 40 meters). The island was named Zalzala Koh (which means "Earthquake mountain" in Urdu), according to NASA. Now, satellite images show, it's pretty much gone.
In case you've forgotten, Earth's sun is totally epic: It's home to towering fountains of plasma, "lava lamp blobs" of mystery matter 500 times larger than Earth, and a writhing magnetic field that twists, turns, snaps and lashes out into space every 11 years or so, seriously screwing with Earth's power grid.
While trying to better understand that 11-year stellar-tantrum cycle, characterized by a sudden increase in sunspot activity near the sun's equator, scientists discovered a new form of solar epicness you should probably be aware of. When one solar cycle ends and the next begins, the researchers wrote, the sun may experience cataclysmic magnetic field collisions — known as "terminator events" — resulting in gargantuan tsunamis of plasma that can charge across the sun's surface for weeks at a time.
Posted March 17, 2021 by Emma Mills
Posted March 17, 2021 by Emma Mills
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