Mexico earthquake M5.4 - a little spice

They've been getting a few now.  This coast usually spits out M8's, with the capability for a doozy M9.  The last big Mexico City earthquake was around here.  That basin is deep soft soil inside a soft rock basin.  It is capable of amplifying PGV by a 100 times.  Of course, it doesn't amplify PGA, so nobody cares.  :(   It's just one of those many cities with zero seismic capacity, with the same odds for a big earthquake.  Most likely the next big earthquake won't be here.

M3.1 earthquake at Arkansas lake

Wow, can the Fish predict them or what?  I just did a blog of the earthquakes around the lake, and this pops up.  As with Virginia, larger earthquakes should be farther away from the source, since they need more room (fault area).  This was what I was looking for, namely a sustaining mechanism.

With a lot of earthquakes, they spring the 'rat trap' of high stresses, and then become locked out.  In other  words, the stress release is in the form of an isolated 'bubble'.  No more action is expected.  However, where there is a steady supply of water, as in a river, lake or injection, every earthquake will provide a channel for flow.   The best mechanism was the original Arkansas injection sequence, and I expect big things from this one.  :)

Update:  Downgraded to an M2.8, but now we have three of them at this location.  The only other possibility is injection.

Update2:  Up to 4 earthquakes now.

Arkansas lake effect earthquakes

The earthquakes continue around the dammed lake.  Looks fairly random and I can't see a mechanism developing.  Nevertheless, we should all remember Virginia.  As I was tracking this earthquake and aftershocks there was a pattern to that lake, indicating a trigger.  However, for the life of me, I can't find a good map of all the earthquakes there.  A time sequence would be nice, as well.  Just think of this basement rock as full of big rat traps, baited and ready to go, just waiting for a little bit of water.  :)