A different kind of Oklahoma boom
That was not an explosion that woke people up in Edmond-north Oklahoma City-Guthrie and environs the other day. As strange as it might have sounded, it was an earthquake.
• 10 km (6 miles) N of Edmond, Oklahoma.
• 15 km (9 miles) SSW of Guthrie, Oklahoma.
• 27 km (16 miles) NNE of Warr Acres, Oklahoma.
• 28 km (17 miles) NNE of Bethany, Oklahoma.
Plus some other details about “surface wave magnitude” and the like.
But here's the really fun part: The “Did You Feel It” page at http://earthquake.usgs.gov/earthquakes/eventpage/dyfi/.
It lets you submit your own details:
What was your situation during the earthquake? (Inside a building, in my case). Select the option that best describes the structure you were in at the time. (Single-family home). Were you asleep? Did others nearby feel it? Shaking strength? Shaking duration (2 seconds, in my case). How did you react? (Excitement).
Was there any damage to the building? Options range from “No Damage” and “Hairline cracks in walls” to “Masonry fell from block or brick wall(s)” to “Separation of porch, balcony, or other addition from building” and “Building permanently shifted over foundation.”
In a nutshell: It sounded like an explosion a mile or two away. The sensation lasted just that long: the duration of a boom. I was surprised, actually, to learn it was an earthquake.
No shake, not much of a rattle, no roll. Just a boom. A real different kind of boom.