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New seismic data provide structural basis for strong earthquakes that strike at both ends of the Pacific Northwest fault zone.
With four years of data from 268 seismometers on the ocean floor and several hundred on land, researchers have found anomalies in the upper mantle below both ends of the Cascadia Subduction Zone. They may influence the location, frequency and strength of earthquake events along the U.S. Pacific Northwest.
The mantle is rising under the southern Gorda deformation zone at the north edge of the San Andreas Fault and under the Olympic Peninsula and southern Vancouver Island.
“Our study is worse news for Portland northward to Seattle and for southern Cascadia, but central Cascadia is not off the hook,” said Toomey. “More frequent earthquakes to the north and south are seen in historical seismicity patterns. This research helps to understand that.”
In the Pacific Northwest, the area of impact will cover* some hundred and forty thousand square miles, including Seattle, Tacoma, Portland, Eugene, Salem (the capital city of Oregon), Olympia (the capital of Washington), and some seven million people. When the next full-margin rupture happens, that region will suffer the worst natural disaster in the history of North America.
Tremors shove Washington state west, offer clues to next big earthquake
The Seattle Times Thousands of tiny tremors over the past few months have moved parts of Washington state and Vancouver Island westward. It's a near-annual event that backs expectations by some scientists that a big earthquake may hit the Seattle area harder than their previous models suggested.
originally posted by: Oldtimer2
a reply to: infolurker
Sounds like it is just an example what will happen when that star system gets closer to earth,it will literally be years of disasters,the new madrid will split the US in 2,bad ju ju comming
When the next full-margin rupture happens, that region will suffer the worst natural disaster in the history of North America.