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Scientists find source of supervolcano in Italy; Bali tremors trigger new fears
by Brooks Hays
Washington DC (UPI) Sep 18, 2017


Tremors trigger fears of volcanic eruption in Bali
Jakarta (AFP) Sept 20, 2017 - Authorities have raised alert levels for a volcano on the Indonesian resort island of Bali after hundreds of small tremors stoked fears it could erupt for the first time in more than 50 years.

Mount Agung, about 75 kilometres from the tourist hub of Kuta, has been rumbling since August and officials have banned people from venturing within 7.5 kilometres (4.7 miles) of its summit.

No volcanic ash has been seen spewing from the crater. But hundreds of small tremors have rattled the mountain in the past two days, causing about 350 people to evacuate their homes Monday, although they returned the next day.

"Even though seismicity is not as sharp as two days ago, as much as 480 seconds of tremors have occurred. The community must remain vigilant," Willem Rampangilei, the head of Indonesia's National Disaster Mitigation Agency, said in a statement Wednesday.

The airport on the resort island, a top holiday destination that attracts millions of foreign tourists every year, has not been affected but airport management are watching the situation closely.

"All flight activities are still normal, there is no cancellation or volcanic ash," Yanus Suprayogi, a spokesman for Bali's Ngurah Rai airport, told AFP.

Mount Agung last erupted in 1963, killing more than 1,000 people.

Researchers have discovered the magma source, or so-called "hot zone," of a supervolcano in southern Italy.

Campi Flegrei has been relatively quiet for the last few decades, and hasn't erupted for centuries. In the 1980s, a rush of magma into the volcano's shallow chamber triggered a few small earthquakes.

Seismographic data from those rumbles allowed scientists to pinpoint the source of the magma that flooded into Campi Flegrei's chamber and caldera -- the hot zone. Analysis of the supervolcano's hot zone suggests Campi Flegrei could be nearing an eruption.

By mapping the hot zone, scientists may be able to better predict when volcanoes are going to erupt, allowing officials to evacuate vulnerable populations.

"One question that has puzzled scientists is where magma is located beneath the caldera, and our study provides the first evidence of a hot zone under the city of Pozzuoli that extends into the sea," Dr. Luca De Siena, a researcher at the University of Aberdeen, said in a news release. "While this is the most probable location of a small batch of magma, it could also be the heated fluid-filled top of a wider magma chamber, located even deeper."

Because Campi Flegrei hasn't made much noise over the last 30 years, scientists believe pressure could be building in the supervolcano's pipes.

"Whatever produced the activity under Pozzuoli in the 1980s has migrated somewhere else, so the danger doesn't just lie in the same spot, it could now be much nearer to Naples which is more densely populated," De Siena said.

Researchers liken the volcano's hot zone to a boiling pot of soup. Over the last several years, the volcano has gotten considerably hotter.

"What this means in terms of the scale of any future eruption we cannot say, but there is no doubt that the volcano is becoming more dangerous," De Siena said. "The big question we have to answer now is if it is a big layer of magma that is rising to the surface, or something less worrying which could find its way to the surface out at sea."

Researchers published their analysis of Campi Flegrei this week in the journal Scientific Reports.

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Italian couple and son die after falling into volcanic crater
Rome (AFP) Sept 12, 2017
An Italian couple and their 11-year-old son died Tuesday after falling into a shallow volcanic crater near the southern city of Naples, local officials said. The family of four - including a seven-year-old boy who survived - were visiting Solfatara, one of the main attractions at the popular Campi Flegrei ("Burning Fields") volcanic tourist area, about 30 kilometres (20 miles) east of Nap ... read more

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