Blue Light Spotted in Marrakesh Sky before Earthquake

A man stands next to a damaged hotel after the earthquake inMoulay Brahim village, near the epicentre of the earthquake, outsideMarrakech, Morocco, September 9, 2023. (Mosa'ab Elshamy/AP)
A man stands next to a damaged hotel after the earthquake inMoulay Brahim village, near the epicentre of the earthquake, outsideMarrakech, Morocco, September 9, 2023. (Mosa'ab Elshamy/AP)
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Blue Light Spotted in Marrakesh Sky before Earthquake

A man stands next to a damaged hotel after the earthquake inMoulay Brahim village, near the epicentre of the earthquake, outsideMarrakech, Morocco, September 9, 2023. (Mosa'ab Elshamy/AP)
A man stands next to a damaged hotel after the earthquake inMoulay Brahim village, near the epicentre of the earthquake, outsideMarrakech, Morocco, September 9, 2023. (Mosa'ab Elshamy/AP)

When a strong earthquake hit Morocco, footage showing blue lights in the sky right before the disaster, went viral on social media.

Few months ago, similar videos spread before the Kahramanmaras 7.8-magnitude earthquake, which affected Türkiye and parts of Syria.

What are these lights?

 

Like ball lightning, earthquake lights are relatively rare—captivating but hard for scientists to explain. These instances of luminosity around earthquakes don't all look the same, sparking theories that range from plain old lightning to UFOs.

The lights can take "many different shapes, forms, and colors," Friedemann Freund, an adjunct professor of physics at San Jose State University and a senior researcher at NASA's Ames Research Center, said in a 2014 National Geographic interview.

 

Earthquake lights in history

 

Freund and colleagues studied 65 accounts of such lights reaching as far back as 1600, publishing their findings in the journal Seismological Research Letters in 2014.

On November 12, 1988, for example, people reported a bright purple-pink globe of light along the St. Lawrence River in Quebec, 11 days before a powerful quake. In Pisco, Peru, the lights were bright flashes that lit up the sky, captured in security camera video before an 8.0-magnitude quake in 2007. Before a 2009 earthquake in L'Aquila, Italy, 10-centimetre flames of light were seen flickering above a stone street.

 

Are they real?

The US Geological Survey is circumspect about whether earthquake lights, or EQL, really exist. "Geophysicists differ on the extent to which they think that individual reports of unusual lighting near the time and epicenter of an earthquake actually represent EQL," the agency says on its website.

 

What could cause earthquake lights?

Analyzing 65 earthquake light incidents for patterns, Freund and colleagues theorized that the lights are caused by electric charges activated in certain types of rocks during seismic activity, "as if you switched on a battery in the Earth's crust".

Basalt and gabbro rocks, for example, have tiny defects in their crystals that could release electrical charges into the air.

The conditions that lend themselves to the lights exist in less than 0.5 percent of earthquakes worldwide, the scientists estimated, which would explain why they have been relatively rare.

They also noted that the earthquake lights more commonly appear before or during quakes, not as much afterward.

An earlier study proposed that tectonic stress created a so-called "piezoelectric effect", in which quartz-bearing rocks produce strong electric fields when compressed in a certain way.

But one of the complications in studying earthquake lights is, of course, that they're unpredictable and short-lived. In an attempt to work around this, some scientists have attempted to recreate the phenomenon in the lab.

In a study led by a physicist at New Jersey's Rutgers University and published in 2014, grains of different materials—flour and plastic—produced voltage spikes when agitated. The scientists attributed this effect to friction between the grains, which would contradict both the piezoelectric theory and Freund's.

As long as conflicting scientific theories emerge, the debate over causes of earthquake lights stands to remain charged.



S.Africa's Iconic Protea Flower Relocates as Climate Warms

Protea flower grower Nico Thuynsma cultivates the blooms north of Johannesburg, 1,500 km (930 miles) from their natural home at the southern tip of Africa. Phill Magakoe / AFP
Protea flower grower Nico Thuynsma cultivates the blooms north of Johannesburg, 1,500 km (930 miles) from their natural home at the southern tip of Africa. Phill Magakoe / AFP
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S.Africa's Iconic Protea Flower Relocates as Climate Warms

Protea flower grower Nico Thuynsma cultivates the blooms north of Johannesburg, 1,500 km (930 miles) from their natural home at the southern tip of Africa. Phill Magakoe / AFP
Protea flower grower Nico Thuynsma cultivates the blooms north of Johannesburg, 1,500 km (930 miles) from their natural home at the southern tip of Africa. Phill Magakoe / AFP

On his farm two hours north of Johannesburg, Nico Thuynsma gestured towards thousands of orange, yellow and pink proteas in flower and thriving 1,500 kilometers (930 miles) from their natural home at the southern tip of Africa.

"They're all different," the 55-year-old farmer said of the assorted blooms from the diverse Proteaceae family that has more than 350 species in South Africa, from firework-like "pincushion" varieties to delicate "blushing brides".

He picked out a majestic pink and white crown, nearly the size of his head, that has taken four years to reach its impressive size. "The King Proteas are very slow to grow," Thuynsma said.

The largest of the proteas, the King Protea, is South Africa's national flower.

It has lent its name to the national cricket team and countless brands. It features on the currency and is the logo for South Africa's presidency this year of the G20 group of leading economies, which convenes a summit in November.

It is also the country's largest flower export with more than 10 million stems sent abroad last year, worth close to 275 million rand ($15 million), according to the Cape Flora industry organization, said AFP.

Its status offers the King Protea some protection but almost half of South Africa's other protea species face extinction because of pressures on their native habitats in the mountains of the Cape, according to South Africa's National Biodiversity Institute (SANBI).

These include habitat loss to agriculture, the proliferation of invasive alien species and "changes to natural fire cycles", SANBI said in a 2021 report.

Icon

"People come to South Africa to see proteas," Nigel Barker, a professor in plant sciences at the University of Pretoria, told AFP. "It's the plant equivalent of the elephant or the lion."

Most proteas are endemic or semi-endemic to the Cape Floral Kingdom biome of "fynbos" ("fine bush") that stretches across the southern tip of South Africa and is one of the world's richest flora biodiversity hotspots.

But climate projections predict "hotter, drier conditions", Barker said. "We'll be looking at a completely different vegetation type in the future, semi-desert almost in some places."

"Many species, because they're so range-restricted, will probably go extinct under those scenarios," he said.

"The only solution we have is to cultivate them artificially... in greenhouses or farms where you control irrigation," Barker said.

An example is Thuynsma's farm in the grasslands of the north, where he began planting proteas three decades ago.

Here, winters are dry and frosty, and the summers rainy -- conditions very different to those in the far south where the proteas are at home.

Gel for irrigation

Through trial and error, Thuynsma has been able to cultivate close to 200 protea varieties, including some long forgotten and abandoned by farmers in their original habitats.

In his latest experiment, he has planted 36 varieties with just two liters (four pints) of saturated gel for irrigation.

"I hope to unlock the power of some of these varieties," Thuynsma said. "They come from the Western Cape out of very harsh conditions, so they do have it in them."

"I learn from them, I learn with them. And, hopefully, in the future I can advise my nursery public -- and even estates -- how to plant this lovely fynbos without irrigation," he said.

"I don't think I have a solution for climate change," he joked, crouched over a small seedling in freshly turned soil. "But I do have a solution: to plant proteas."

A few meters (yards) away, in a warm nursery, thousands of protea sprouts awaited their turn in the soil.

"I love them, I protect them, I collect them," Thuynsma said. "The protea is part of South Africa's DNA."