Ok I will try, but anyone with geology knowledge please help here.
This earthquake essentially created a huge seismic bang and wave that moved out relatively uniformly from the epicentre.
Around the Nth Slope area are shake stations and seismographs, including an array set up in Alaska, (see below). These measure the seismic activity and when strung together can form a picture of how the wave moved and what influenced it's travels
This earthquake will be extremely important for understanding North Slope seismicity and, more generally, how seismic waves travel throughout Alaska. We are very fortunate that this earthquake happened during the Transportable Array deployment in Alaska. Before 2013, the nearest stations would have been at Pump Station 1 and Pump Station 4. Instead, we have high quality recordings from a number of research-grade stations fairly close to the source.Below is the picture I put up with the red circle showing where IW2 is(and from there you can guess where the 88E areas are). What caught my eye was the two light blue lines not joining, (blue circle). I would have assumed that the shock radiated out relatively uniformly and the stations would have plotted that light grey line as sort of a circle.
View attachment 1238796
But the lines were not as uniform as I would have expected. I checked where the shake and seismic stations are (grey Triangles), there was good coverage out to the west where IW2 is so they should have had no problems measuring it. (See below)
View attachment 1238802
So my hypotenuse is that a significant geological structure interrupted the wave somewhere around that area and changed the way that the wave travelled, (I suspect around where the line drops vertically), this would have to be soft? as anything hard would have magnified the shock and this smothered it?
What does it mean.....no idea, someone a lot more geologically trained may have an answer to that.
How ever I will say that any 2D or 3D mapping seismic equipment in the ground at the time or after during aftershocks would now have a lot of seismic data recorded, A LOT of data from very deep and covering one hell of an area.
Will be interesting to see what comes out of this.
p.s. I will also be very interested on what the pressure readings are after the Earthquake at IW2 compared to before.
p.p.s. I could be so far off that I am on another planet, wife reckons I am anyway.
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