And here it is.
You’re looking at the electronic seismograph for Mt. Hood. See where the lines get absolutely crazy about halfway down? That’s the energy from Japan’s 8.9 “Great quake” vibrating underneath Oregon’s most famous peak.
The really dense section is the actual subduction zone quake, which lasted an estimated 2-3 minutes. That’s non-stop shaking we’re talking about.
The smaller but still visible ‘scribbles’ on the bottom third are some of the major aftershocks being detected under Mt. Hood.
4 Facts About The March 2011 Japanese Quake
- it was the strongest quake ever recorded in Japan
- it ties for the fifth strongest earthquake in world history. at least back to 1890, when we first started measuring the quakes
- it’s similar in strength to a subduction zone quake that happened off the Oregon Coast in 1700. That quake is believed to have been about a 9.0
- the Univeristy of Washington’s Webicorder network detected the Japan quake’s energy under other peaks, too: Mt. Rainier, Mount St. Helens and even Crater Lake