An earthquake during the day, when most people are out and about, could be worse than one in the middle of the night.
No one can say when exactly the next Cascadia megaquake will strike other than there's a fair chance it'll happen in our lifetimes. Having a well-stocked earthquake kit is a good place to start.The Portland Bureau of Emergency Management has been working to train a cadre of volunteers under the moniker That last point will take on special significance in a mass casualty event, Douthit said, as it will keep those with minor injuries from flooding to emergency rooms. While a quake on that fault is less likely than a subduction zone quake, a large temblor on a fault running right through Portland could be far more deadly.The report produced damage estimates for both a magnitude 9.0 quake on the Cascadia Subduction Zone and a magnitude 6.8 quake on the Portland Hills Fault.
When the 'Big One' hits, Portland faces mass casualties, widespread destruction: Study Updated Jan 30, 2019; Posted Mar 15, 2018 Earthquake damage at … Vast swaths of Portland's west side, a large stretch of the south bank of the Columbia River and portions of the city's inner east side are all at high risk of liquefaction or landslides, especially if the quake strikes during the wet winter months, the report said.A map of the metro area shows which areas are susceptible to liquefaction and landslides during a major earthquake. Continue Reading How Will ‘The Big One’ Earthquake Affect Portland And SW Washington? Some other subduction zones have such earthquakes every 100 to 200 years; the longer interval results from slower plate motions. Monetary estimates for repairs and rebuilding range from $23 billion to $36 billion.Up to 85,000 people could be displaced for long periods of time and the quake would produce between roughly 13 and 18 million tons of debris. "Although damage estimates vary widely throughout the study area, no community will be unharmed," the report said.While the Cascadia Subduction Zone has garnered more public attention in recent years, the lesser-known Portland Hills Fault has the potential to cause more damage, according to the report, though it is far less likely to occur.While the subduction zone has seen some 40 major quakes over the last 10,000 years, the Portland Hills Fault is thought to have only produced two sizable seismic events over the last 15,000 years. New research from the University of Oregon provides a clearer picture of where the "Big One" could strike along the Cascadia Subduction Zone. "Note to readers: if you purchase something through one of our affiliate links we may earn a commission.Registration on or use of this site constitutes acceptance of our Another 1,600 structures are built of unreinforced masonry, Douthit said, and are particularly vulnerable to shaking. A southern Big One would likely strike a little further away from the heart of Los Angeles, so the impact might be smaller.
Earthquake damage at Molalla High School following the Spring Break Quake in 1993. All of those critical pieces of infrastructure, as well as the 1.6 million people who live in the region, would be affected by a major earthquake.Not every earthquake is the same, however, and the report laid out a few different scenarios for what could be waiting for Portland and the surrounding area.The earthquake that Pacific Northwesterners have long known about and feared is one caused by a rupture of the Cascadia Subduction Zone, the 600-mile-long fault that sits ominously off the west coast, running from Northern California up to Vancouver, B.C.The subduction zone, and the danger it poses, was cast into stark relief by The fault is divided into sections, each of which could produce a moderate quake, but the report is modeled for the so-called "big one," in which the whole fault slips and a massive magnitude 9.0 temblor shakes the entire region.But the fault buried under the ocean is not the only one that threatens the metro area. "Dan Douthit, a spokesman for the Portland Bureau of Emergency Management, agreed, saying the report was not intended to scare people, but to reinforce the need to prepare.
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