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11-06-2014, 01:00 PM
Hi all,
OK, I'm now very curious about what is going on. So, I actually made a figure comparing Nov 6 2014 earthquakes to Google Earth at same scale. I could not find easily much geology, but did find:
"The western edge is formed by a spectacular fault scarp with huge rims above vegetated talus slopes."
at:
http://www.blm.gov/style/medialib/blm/nv...%20WSA.pdf
I put a red oval on area of main quake swarm, which may have spread, and is now ~20 km across (=big).
Arrows are to possible fault scarps. This looks to be the Basin and Range of extension, where the ranges are footwalls of normal faults and the basins are the hanging-walls. It is common for the ranges to be back-tilted into the faults, above each fault. This could be the case here. While a very large scale geologic map of Nevada online showed faults in this area, I made no attempt to get a detailed map and match it to Google Earth. So, my interpretation is educated/speculative.
More on this in next post: I want to see if graphics work first:
OK, there is a symbol but cannot see graphics
Chris
OK, I'm now very curious about what is going on. So, I actually made a figure comparing Nov 6 2014 earthquakes to Google Earth at same scale. I could not find easily much geology, but did find:
"The western edge is formed by a spectacular fault scarp with huge rims above vegetated talus slopes."
at:
http://www.blm.gov/style/medialib/blm/nv...%20WSA.pdf
I put a red oval on area of main quake swarm, which may have spread, and is now ~20 km across (=big).
Arrows are to possible fault scarps. This looks to be the Basin and Range of extension, where the ranges are footwalls of normal faults and the basins are the hanging-walls. It is common for the ranges to be back-tilted into the faults, above each fault. This could be the case here. While a very large scale geologic map of Nevada online showed faults in this area, I made no attempt to get a detailed map and match it to Google Earth. So, my interpretation is educated/speculative.
More on this in next post: I want to see if graphics work first:
OK, there is a symbol but cannot see graphics
Chris