Upon further review and importing data I have into google earth, I now believe this swarm activity could very well be related to the Salton Buttes
volcanic field. Take a look at this pic I generated of all the activity, which includes activity near the volcano you may not be seeing at the main
USGS quake site:
There are several points which I feel I should mention to support this possibility:
1. Note the recent quake activity directly in the field, not just in the swarm location.
2. The swarm activity is coincident with the activity in the volcanic field, now that you can see all the quakes. This is all recent activity, in the
3. The activity is consistently shallow, typical of volcanic- generated seismicity- but not always.
4. The wide area of epicenters does not exhibit the typical main shock/after shock sequence- if this were tectonic. Note that specifically, a lot of
the seismicity is actually away from the faults, marked in red. But I may not have all the faults listed, going to check further on that.
5. This could be some kind of dyke intrusion or other magmatic driven seismicity. It could even be a combination of both- a magmatic process that
induced movement on the fault to create the bigger quakes in the series. Volcanoes don't usually have quakes in the the upper 5's. And that is
particularly perplexing in this sequence. Because if this is volcanic, and we are seeing quakes that big...umm... that is not good. At all.
I don't discount totally the possibility of this all being tectonic, but after I got more info, my opinion is back to center, and not leaning towards
tectonic. I await further comment from professionals, as information surfaces. The area is known for spreading, so it still could be that.
I felt this information was deserving of its own thread so it doesn't get lost in the shuffle, however if the mods feel differently, then close
edit on Sun Aug 26th 2012 by TrueAmerican because: (no reason given)