Sunday, November 10, 2024

Large Cuba earthquake - M7 thrust

 After hurricanes, power failures, etc, we have a big earthquake.  An M7 shallow thrust is like the Kobe earthquake, and is the deadliest type, based on ground velocity.  We don't know much right now.


That fault plane solution is thrust with strike-slip.


We have the main Caribbean fault there, and this is connected with the Haiti earthquake.  In the historical records, earthquakes on this fault come one right after another.  Should be a big one soon north of Haiti.

You can see the beautiful clean fault zone.  It's partially subduction with a slide to the east.  This earthquake fits the picture of being a foreshock to an M9, but that's a hundred to one.

We won't learn anything from this earthquake because all the construction is suspect, and there is no instrumentation.  I'm guessing 80 cm/s in the worst zones, and that's enough to tip a solid building.

ps. you can see the full fault now, with the aftershocks.  This is absolutely a foreshock, but it might take 20 years.  I think all the historic big earthquakes were done in 50 years, but I don't remember.


ps you can see the historical earthquakes here.  Nothing over M8, but that's a historical rating.  You can see they come in clusters.


ps please remember that there is a 90% chance that this is a one-off event for now.



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