The authors of the new work studied the rings in the Douglas firs and learned about the scale of the earthquake that
Cascadia subduction zone - it is a convergent plate boundary that extends from North Vancouver Islandin Canada to Northern California in the United States.Every 300 yearsCascadia has a major earthquake of magnitude 9 or 10, the last major earthquake occurred in 1700.
The authors of the new work suggest that in 1700 there was not only an earthquake, but also a tsunami that affected the growthtrees, as it caused a massive flood of Moska water. The updated tsunami model shows that this tsunamiThis area could be 10 meters submerged in water.
The tsunami appears to have been the event that has had the biggest impact on growthThis information will help us predict whenthe next event like this.
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To begin with, the authors found the most suitabletrees that grow as close as possible to the coastline, then they collected core samples from about 38 of them: all this was done without prejudice to the general condition of the trees. Most of them have been growing since about 1670.
The authors analyzed the growth rates of the rings andcompared them with data on fir trees that grow in other areas. They found that in 1700, trees in the tsunami flood zone began to grow much more slowly.
Researchers are still working to figure out how the tsunami affected the growthtrees, as they grow relatively far from the shoreline.They believe that this could have happened with a combination of an earthquake and seawater flooding.
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