Here’s the electronic seismograph from Mt. Hood on Friday night September 7, 2012–at 9:57.
The bright red squiggle shows energy from the Willamette Valley 3.5 earthquake as it passed under the mountain.
Next, here’s the actual map of the epicenter–between Woodburn & Molalla!
This earthquake centered 27 miles south of Portland was pretty deep – nearly 20 miles below the surface. So that limits its power and energy that we can feel.
This is not terribly far from the Mt. Angel area – the epicenter of Oregon’s infamous ‘spring break quake.’
What’s strange about this earthquake? For me, it’s this: my wife & I were talking about some fatal earthquakes that hit China today. At that instant, our window cracked (I heard that) and our bed shook (my wife felt that). We both said, “What? Was that an earthquake?” I doubted it was–but my wife was convinced she’d felt a quake. She was right!
So, what does this earthquake mean? Most of the time–it’s just earth’s way of relieving stress along a fault line. But on very rare occasions–it can signal a bigger quake or perhaps be the start of a series of quakes in an area.
Hopefully this is in the ‘most of the time’ category!