Bad News: New active fault lines discovered on Mount Hood could potentially trigger a 7.2 magnitude earthquake, devastating everything as far as Portland

Tuesday, October 23, 2018
By Paul Martin
Oct 23, 2018

Mount Hood is a potentially active stratovolcano in the Cascade Volcanic Arc of northern Oregon. Researchers have discovered active fault lines on Mount Hood that could potentially trigger a 7.2 magnitude earthquake, devastating communities and infrastructure as far west as Portland. The fault networks are located to the north, south and southwest of Mt. Hood and extend to the Columbia River.

A 7.2 magnitude earthquake is larger than the 1989 earthquake near the San Francisco Bay Area. The faults on Mount Hood are closer to Portland that the epicenter of the 1989 earthquake was to San Francisco.

This would be a crustal earthquake as opposed to the Cascadia subduction zone earthquake Portland has been bracing for. Subduction zone quakes are deeper below the surface, they last longer — as long as seven minutes — but they are lower in amplitude. The kind of quake we would get from Mt. Hood would be shorter — 20 seconds to less than a minute — and would be strong enough to knock you off your feet.

A large quake like that would pose a significant hazard to the cities of Hood River, Odell, Parkdale, White Salmon, Stevenson, Cascade Locks, Government Camp and the Villages at Mount Hood.

The Portland metro would experience strong ground motions and could suffer liquefaction damage along waterfront areas.

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