Can the monster earthquake already drown part of California?

Can the monster earthquake already drown part of California?

Here is the flag behind the terrifying headlines about the sinking of the northwest of the Pacific Ocean in the sea from a major earthquake

It was Stphanie Pappas to Jeanna Bryner

Sitka TPURUCE trunks, drowned from a landing during an earthquake in the integration area about 1600 years ago, in Neskowin, raw.

Marli Miller/UCG/Universal Images Group via Getty Images

The frightening headlines revolve around the northwest of the Pacific Ocean online on the Internet, with warnings that a large earthquake in a notorious Cascadia cutting area may be worse than expected.

What is behind this new alarm? Fortunately, the search for a new danger did not reveal that Seattle will become the lost city of Atlantis. Instead, scientists examined the common effects of a well -known phenomenon: sea level rise from climate change and the potential consequences of a large earthquake in the region. It was already known that the sea level along the coast of northern California, Oregon and Washington is estimated to rise by 1.3 to 2.9 feet by 2100 due to the warming climate. It was also known that the 8 or higher earthquake in the area could cause the coastal line to decline by up to 6.5 feet. What the new study, published on April 28, adds to the facts of the National Academy of the United States of America, is an understanding of the amount of additional lands that will end up with a great danger of floods due to these two common threats.

Why is sea level rising? To support the scientific press

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While the eastern coast already sees the effects of beach erosion and high sea levels, the northwest of the Pacific Ocean (PNW) has been protected by its geology – so far. The coast, which runs from northern California, is located to Vancouver Island, British Columbia, in a starting area where Juan de Voca dishes slide and oceanic Gordda under the continental plate in North America – devices of moving rock panels that make up our planet. Currently, the faults system is calm, which means that it has not had a large earthquake for more than 300 years, and the coast is gradually attributed to a few fractures of the inch every year. This geological height, which is the result of tectonic plates interactions, outperformed sea level in many areas, and therefore PNW is relatively protected from traces such as severe flood events or coastal corrosion.

But over the past 7000 years or so, at least 11 main earthquakes have struck the Cascadi region, where these breakdowns are located. The last of these cables occurred in 1700, and geologists still see evidence that it caused the coastal line to decrease between 1.6 and 6.5 feet in the blink of an eye. “We have this organic soil that is really rooted, which is truly dominated by the tidal clay, which indicates that it was suddenly dropped, buried and converted mainly into tidal apartments,” says Tina Dura, a coastal geology world in Virginia Tech and the new study author.

What no one truly taught, says a role, was the common effect of this sudden decline and the slower immersion caused by sea level rise.

How many Cascadia will be vulnerable to floods?

The role and colleagues looked at the earthquake scenarios that would result in various domains of landing, from 1.6 to 6.5 feet. They also compared the effects of such an earthquake on sea levels today with those in sea levels expected for 2100. By that time, it is expected that sea level rise will outperform the geological lifting of PNW and may reach 2.9 feet.

The team found that if the earthquake that caused more than six feet of landing today, the 100 -year -old flood plains in the estuary of rivers in Cckadia will expand by 115 square miles. If this earthquake would happen in the year 2100, with additional pressure from sea level rise, these estuaries will expand by 145 square miles. This will be three times the area exposed to the floods that are seen today.

How worried about us?

In the event of an 8th earthquake in Cascadia, the first number will not be in the mind of anyone. An earthquake under the great sea can cause a devastating tsunami that will immediately threaten lives and structures. The new study focuses on the areas that focus about six feet of the current 100 -year -old flood, says Dura, and it may be a tsunami that is driven by the earthquake more than 30 feet.

A good comparison may be a Sumatra earthquake in 2004 and Tenami, which killed more than 227,000 people around the Indian Ocean or the 2011 T & OMACR earthquake; Hoku and Tsunami that killed more than 16,000 in Japan. Both caused a decline, but the intensity of the initial catastrophe that shattered the interests about the coastal recession.

Understanding landing is important for preparation, however, he says a role. Croal planners may want to avoid building new electric sub -stations or wastewater treatment plants in areas where the plains of floods can become. (Flood plains for 100 years have a 1 percent chance in floods every year.) The tidal -dependent floods can affect low bridges, roads and airports in the wake of the direct earthquake to evacuation efforts and rescue attempts. Many people may find that the property that was safe from floods has now been overwhelmed regularly, especially in built areas such as Seaside and Ore. GEARHART and Ore. Grays Harbour County in Washington.

“Tsunami is a process that takes minutes to hours of the earthquake,” she says, while Tsunami recedes, we will still get at the level of the Earth that has decreased and changed the fingerprint of the plains. “

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