Monster Quick may drown in California, and increase the risk of flood

A long monster earthquake in California, Oregon and Washington may cause some coastal areas to sink by more than 6 feet, which greatly increases the risk of flooding and radically reshaping the area without little or without warning.

These are the results of a new study that examined the repercussions of a massive earthquake in the integration area in Cascadi, which extends from northern California to Vancouver Island in Canada.

The study, published on Monday in the Journal of the National Academy of Sciences, concluded that in the earthquake scenario that extends to the highest level of landing, or the Earth's sink, the region at the risk of floods will expand by 116 square miles, which is a group of San Francisco.

Such a scenario would exceed twice the “exposure to the floods of the population, structures and roads”, and officials will need to face the future of “roads and bridges at risk”, as well as the lifestyle and infrastructure that either more than floods or immerses them permanently.

In other words, a strong earthquake in this field may risk “significantly changing the coast and causes deep and permanent effects on the coastal population, infrastructure and ecosystems,” the study said. Unlike the relative height at sea level, which is gradually moved gradually due to climate change, a result of a large earthquake “will happen within minutes, and leave no time to adapt or dilute.”

Another Megaquake occurred in the CASCADIA cutting area, a 9 -monster monster, in 1700. Based on archaeological evidence, the villages were drowned and should be abandoned, according to the American geological survey.

From the northern coast of California to Washington, scientists say the next great earthquake – size 8 or higher – may cause the floor of the Earth from 1.6 to 6.6 feet, the same range that was seen during the 1700 earthquake.

Currently, more than 8,000 people live in clear areas of floods along the estuary in the Cascadia Coastal. But in the event of a high level of landing after the earthquake, this number will reach three times more than 22,000, the study is calculated.

Nearly 36,000 structures will be threatened by an easy -to -flood, the resulting earthquake, an increase of 168 % over the current number about 13,000.

It will be an additional 777 miles of the road in the new flood plain, almost three times the total at risk to 1212 miles from the road.

Easy -flood is defined as regions that have at least 1 % chance for floods every year, which is considered “of great danger”, according to the FBI. These are the areas that have at least one in 4 by 4 by 4 real estate mortgage for 30 years. Flood insurance must be purchased by home and business owners in areas at risk with mortgages from lenders subject to federal or insured.

Dating, dating back, indicates that there are more than 11 wonderful earthquakes off the North Coast Beach in California, Oregon and Washington over the course of 6000 to 7000 years – repeated every 200 to 800 years.

The study said: “The gradual rise at the sea level, which is moved by the climate is not the only threat to traffic.” “The coastal landing from the next great [Cascadia subduction zone] The earthquake may produce “more than 3 feet than the sudden relative sea level rise closer to what was expected.

When discussing a large group of tremors in the CASCADIA spread area, “We often hear about tsunami and shake. But there will be a decrease that will continue – for decades to centuries – after an earthquake, has not completely changed the plains of floods.”

One of the estimates published by the Fema is that the 9 -size earthquake over the full length of the rift area with a length of 800 miles will leave 5800 dead of the earthquake alone. An additional 8000 will die from the resulting product that can rise to 80 feet and provide coastal areas of up to 10 minutes of warning. The total economic losses can reach $ 134 billion.

This map shows the location of the CASCADIA spread area.

(Fema)

In 1700 Cascadia Megaquake, the history of the mouth describes more than 50 feet that wipes coastal villages. In Anakla, a village on the so -called Vancouver island, only one of the 600 people survived, according to the American geological survey.

The tsunami was so strong that it uprooted the trees. When they finally retreated, tree heads were found scattered with garbage ends and victims. Usgs said that “ghost forests” are trees resistant to the mutations in the tidal swamps in the area are evidence that the land was drowned during the earthquake and drowned trees.

Scientists say that the results of the last study should be an invitation to wake up to residents and government officials who are considering a post -tendency response. There are already parts of the 101st Road that routinely overwhelmed during the high tide and is an exceptional carrot.

Scientists say that other factors that officials must take into account are whether the critical infrastructure, such as airports, will fall within the plain flood that is contesting the earthquake.

Dura said that the authorities may also want to consider avoiding building infrastructure such as schools, firefighting stations and wastewater treatment stations in the areas “that are likely to be in an easy flood.”

The prominent areas of the risk of land drowning include a large group of the spread area in CASCADIA, according to the study, the following:

The Humoult Bay area in California, including the area surrounding Eureka, Arcaata.in Oregon, Waldport and Bayshore along the Bay of Alsea; New Port and South Beach along Yaquina Bay; GEARHART and Seaside along the Necanicum River. In Washington, the Willpa Bay region, including the Long Beach, Ocean Park, Takeland and Raymond; The Grays Harbour, including Ocean Shores, Westport and Abeerdeen.

Traditionally, scientists and government officials focused on the high sea level of the climate to calculate the increasing risks of coastal floods. But the study argues that neglecting the role of major earthquakes will be myopia.

The study said: “The coastal landing moved by the earthquake after the recent historical earthquakes had severe consequences for societies, which led to permanent loss of land, the damage of infrastructure and forced transmission.”

An example of this is an earthquake 9.1 off the East Coast of Japan in 2011, causing some lands to sink up to 3 feet. In an area of ​​Ishinomaki, the soast was forced to face regular floods, according to news reports.

Another 9.1 earthquake, which was struck near Sumatra, Indonesia, in 2004 caused a land of 3 feet. The study said that the areas used in aquaculture have since suffered from chronic tidal floods, which led to an increase in allergy and the loss of lands.

The 9.2 earthquake in Alaska in 1964 caused the drowning of the lands by more than 6 feet along the coast, “providing roads, sidewalks and areas of the waterfront is insecure, in some cases, necessitating the transfer of societies to a higher land or raising the waterfront facilities and air strikes above the high tide.” In some places, the landing was more severe.

Before the 9.2 earthquake in 1964 in Alaska, the sidewalk in front of the stores on the right side of this image of the marina was flat with those on the left.

The study said that the 9.5 earthquake in Chile in 1960 caused up to 8 feet of coastal landing, “the coastal pine forests and farms permanently turned them into tidal swamps, dumping coastal cities and forcing residents to abandon homes.”

Besides Dura, there are 19 other authors of the study, with affiliations including Singhofen Half Associas from Orlando, FLA. ; Oregon University; Rawan University of North Carolina State University; Durham University Usgs. Cal Polly Humoult. Department of Geology in Oregon and Metal Industries; Hong Kong University; Nianang Technology University in Singapore.

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