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Metro Vancouver quake estimates get shakeup

UBC researchers have concluded shaking during an earthquake could be significantly worse than previously estimated in parts of Metro Vancouver due to the dynamics created by an underlying sedimentary basin.

Their findings indicate the shaking intensity and duration could be as much as three to four times more severe in the region due to the presence of the silty Georgia Basin compared to areas with harder bedrock underneath.

The effect of amplified seismic waves would be particularly pronounced in areas such as Delta and Richmond if the earthquake struck to the south or southwest of Metro Vancouver, researchers said.

The Georgia Basin covers the Lower Mainland, southeastern Vancouver Island and northwestern Washington State.

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