The study finds that the risk of flooding is increasing in the northwest of the Pacific Humoult now

A strong earthquake, along with high sea levels, may increase the risk of floods in the northwest of the Pacific, which affects thousands of population and property in northern California, Oregon and Washington, according to a new study published this week in the facts of the National Academy of Sciences.

The study, entitled “Increased Exposure to Classes in the Northwest of the Pacific after the earthquake and sea level rise,” found that the main earthquake can cause coastal land to be drowned to 6.5 feet. This would expand the coastal flood plains by 1 %, which is an area that contains a chance of 1 in 100 for floods each year, by 35-116 square miles.

Harvey Kelissy, a partner researcher in the Department of Geology in Cally Humoult and co -author of the study, explained that the research is the result of several decades of field work that aims to understand the extent of floods after the transition area.

“The expansion of coastal flood plains after the Earthquake of Cascadi's cutting area has not been previously estimated, and the effects needed to use lands can significantly increase the timeline of healing,” said Professor of Earth Sciences at Virginia Tech, author of the previous study of the study in Cal Polly Homold (2017-18).

The research shows that the most sharp effects will strike southern Washington, northern Oregon and northern California.

The researchers have created tens of thousands of earthquake models to estimate the potential scope of the landing-moving earthquake-excessive lands-which can be expected from the following large CASCADIA earthquake. Next, using spatial geographical analysis, the expansion team set by the earthquake in the flood plains by 1 % in 24 calamities and society along the CASCADIA spread. Since the timing of the next large earthquake is not certain, the team was determined to formulate the effects of the stunning earthquake today or in the year 2100, when the climate -moving sea level rise leads to an enlarged effects of the earthquake -based degradation.

The study indicates that after today's earthquake, 14350 of the population, 22,500 structures, and 777 miles of roads will fall into the flood plains after Earthquake, more than double exposure to floods. Possible floods will affect five airports; 18 critical facilities, including public schools, hospitals, police stations and firefighters; Eight wastewater treatment plants. One electrical sub -station; And 57 possible polluting sources, including animal feeding, fuel stations, and solid waste facilities.

By the year 2100, the international governmental committee concerned with climate change shows the expectations of the level of relative sea level that sea levels along the CASCADIA cut area may reach three feet of the day. This height at the sea level, which the climate is exaggerated, amplifies the effects of future earthquakes, more than three times the exposure of floods to the population, structures and roads.

The immediate impact of the outbreak of the earthquake will delay the response and recovery. Dura said that long -term monuments could make many coastal societies uninterrupted.

The low current lands that were developed to graze livestock and agriculture will witness a severe economic loss, as the increase in tidal dumping will lead to the armament of the soil and make it unusable. Additional effects include erosion of natural systems, especially coastal calamities, wetlands, dunes and protective beaches. This acts as warehouses against storm storms and helps to dispel the wave energy to prevent the erosion of sediments and protect property damage.

According to Dura, the loss of these ecosystems may not be recovered, and the internal movement may be bound by terrain and human development.

Dura said: “The loss of wetland land directly directly affects the services of the ecosystem such as water filtering, habitats for fisheries and coastal birds, and the capacity of carbon storage,” advanced wetlands operate as a natural carbon laundry, erosion or convert them into tidal surfaces in a large way. “

The CASCADIA is one of many areas in the “Fire ring”, where the Pacific Panel meets another tectonic plate, causing the strongest earthquakes in the world and the majority of volcanic explosions. However, a large earthquake – who have a seismic volume of more than 8.0 – has not occurred along the CASCADIA spread area since January 26, 1700, making the coastal geological records of previous earthquakes and the associated slope is important to understand this danger.

Researchers, who are documenting geological evidence on a decline in the past, are participating in the seismology group funded by the National Corporation, the Earthquake Center in the Cascadia (Crescent).

Geological evidence from the last 6000 to 7000 years indicates that 11 great earthquakes occurred about 200 to 800 years in the northwest of the Pacific. The last earthquake in the region resulted between 1.5 to 6.5 feet of Earth along the coastal line immediately drowned.

“CASCADIA is a unique place. It is not populated, but most of the estuary of rivers has a society in it, and they are all in the landing zone,” said Dura. “This is frankly as I think the drop can have greater effects than it was during other large earthquakes all over the world.”

Global importance

The areas of spread, which can also be found off the coast of Alaska, Russia, Japan, Indonesia, New Zealand and South America are all similar to that to another. Along parts of these merger areas, there is an initial lift in the upper plate. The pressure between the two paintings is gradually built over the centuries. The resulting earthquake is created when the above plate becomes unexpected. Abroad, the plate rises, forcing an increase in upward water that leads to tsunami. On the beach, the plate retracts, and immediately falls the coast to 6.5 feet.

The earthquake is shaken. For an earthquake 9 size or more, it takes about four to six minutes. During the occurrence of shaking, the Earth decreases, and depending on the tidal conditions, low -floods may face immediate floods. Within 15-20 minutes, he hits a tsunami with more floods. The entire process takes more than 30 minutes, and multiple tsunami may occur more than one to two hours. However, the drowning of the ground will last for decades after centuries after the earthquake.

According to a cycle, the Chilean earthquake in 1960 was immersed in the jungle and pine farms, turning it into the tidal swamps, and the coastal cities were flooded, forcing the residents to abandon their homes; The Alaska earthquake in 1964 was forced to transfer the aircraft societies and aircraft to a higher land; In 2004, the Sumatra Motoric earthquake was destroyed on the waterfront and caused the coast erosion; The 2011 earthquake in Japan caused corrosion, ports, and contributed to a nuclear disaster.

“The impact of global climate change on sea level is widely recognized,” Kelissy said. “However, coastal societies near the merger areas face a greater threat, and often overlooked: the sudden rise in the surface level of the sea reaches 6.5 feet caused by earthquakes of the integration area. While this study focuses on the CASCADIA cutting area in the northwest of the Pacific, threatening similar risks from other coasts – especially those that fall throughout the Pacific, where these risks are always.”

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