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Deep earthquakes within Juan de Fuca plate produce few aftershocks
In the Cascadia subduction zone, medium- and large-sized “intraslab” earthquakes, in which the slip happens within the oceanic plate and below the continental plate, will likely produce only a few detectable aftershocks, according to a new study from the University of Washington and the U.S. Geological Survey.
Seismologists currently make aftershock forecasts based in part on data from other subduction zones around the world. But new research shows that Cascadia intraslab earthquakes, slips that occur within the subducting Juan de Fuca tectonic plate, produce fewer aftershocks compared to similar quakes in other subduction zones. The study shows that in Cascadia, the number of aftershocks for a given magnitude event are less than half the global average for this type of earthquake.
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Hermit Thrush (Photos by Blair Bernson)
There are six spot-breasted thrushes that summer in the United States. The Hermit Thrush is the only one that also winters here. It can be found throughout the year in Washington’s mountains: the Olympics, the Cascades, the Selkirks in the northeast, and the Blues in the southeast. Some birds migrate in late fall to the Puget Lowlands and coastal Washington. This species leaves in spring for its breeding grounds about the time the Swainson’s Thrush arrives.
Insects and berries make up most of the Hermit Thrush’s diet. Insects include ants, beetles, caterpillars, grasshoppers, true bugs, earthworms, spiders, and occasionally small salamanders. It forages on the ground for insects, plucking them from leaf litter and soil. It will also forage by a technique called foot quivering. It shakes bits of grass with its feet to get at insects. Berries are particularly important to its winter diet. They include elderberries, servic