The physical evidence from the Douglas-fir tree rings confirms modeling that depicts the reach of the January 1700 quake, which was the last major earthquake to hit the Cascadia Subduction Zone ...

The physical evidence from the Douglas-fir tree rings confirms modeling that depicts the reach of the January 1700 quake, which was the last major earthquake to hit the Cascadia Subduction Zone, ...

Black has been applying tree-ring techniques to the growth increments of long-lived marine and ... (2009, August 8). Douglas-fir, Geoducks Make Strange Bedfellows In Studying Climate Change ...

The trees' growth between 1984 and 2008 was packed into just a millimeter. The trees had a particularly severe case of Swiss needle cast, a disease caused by a fungus that infects Douglas fir ...

Tree-ring increment cores collected from bigcone Douglas fir trees growing on Mount Pinos in Southern California. Each growth ring is a couplet of light colored spring wood and dark colored summer ...

This Douglas-fir sample from the Southwest has annual tree rings dating back to the year 1527. The narrowing of the rings that formed from the 1560s through the 1590s indicates that the tree grew ...

For this study, the BYU geographer took sample cores from Douglas fir and pinyon pine trees. The thickness of annual growth rings for these species is especially sensitive to water supply. Using ...

Jessie and Bryan believe this tree is so old, they won't be able to rely on the known Douglas fir chronology for the region. Instead, they'll have to use a far newer trick of the dendrochronology ...

The Douglas fir, the state tree of Oregon, can grow incredibly tall and live impressively long. The oldest Douglas fir trees have lived to be over 1,000 years old. Fox News Media ...

While Douglas firs also go by Douglas tree, Oregon pine, and Douglas spruce, this tree is not a fir, pine, or spruce. This can make identification challenging when you look at the needle formation ...

If your gorgeous Douglas fir is looking sickly or defoliated, there’s one pest you’d better check for, and fast! We show you how to tackle the Douglas fir tussock moth ...