Even scientists are stumped by the ea...

Even scientists are stumped by the earthquake that rattled the Keys

There are 3 comments on the Front www.keysnet.com story from Jan 11, 2014, titled Even scientists are stumped by the earthquake that rattled the Keys. In it, Front www.keysnet.com reports that:

Even seasoned scientists were surprised by a rare 5.1-magnitude earthquake that struck Thursday afternoon off the northern coast of Cuba, rattling residents on both sides of the Florida Straits, including in Key West and Marathon.

Join the discussion below, or Read more at Front www.keysnet.com.

“Geologist [I'm Climate Change]”

Since: Mar 07

formerly Nuneaton

#1 Jan 13, 2014
Saw the beachball diagram in the USGS and it is a rift aligned mostly with the late Cretaceous Cuba arc (which collided with the Bahamas and got arrested), and also with the central American arc & the Cayman trough rift.

Appears to be crustal extension spreading the Cuba arc which is therefore uplifting slowly due to isostasy, as the hot deep rock is brought slowly to the surface. This quake is the drop of a keystone block in the uplifting Cuba forearc.

The other cause of the rift & spread is the crustal relaxation caused by a prior megathrust earthquake @ the Central America arc, & Backarc basin, Guatemala arc & range, & also the Chiapas arc & backarc basin, which was about 950AD & caused a major palaeo tsunami in New Zealand with a height of over 10m @ the time. As the crust is relaxed from this major megathrust event and is only slowly compressing (so far)@ the forearc & arc, equilibration results in a small amount of continuing backarc spread which continues right to the ex Cuba megathrust which is now a backarc backfault.

An interesting result this one as it is a mite bigger than the average cuba arc quake & therefore big enough to give a beachball diagram (handy).

Have a nice day: Ag
Mannie

United States

#2 Jan 13, 2014
Adrian Godsafe MSc wrote:
Saw the beachball diagram in the USGS and it is a rift aligned mostly with the late Cretaceous Cuba arc (which collided with the Bahamas and got arrested), and also with the central American arc & the Cayman trough rift.
Appears to be crustal extension spreading the Cuba arc which is therefore uplifting slowly due to isostasy, as the hot deep rock is brought slowly to the surface. This quake is the drop of a keystone block in the uplifting Cuba forearc.
The other cause of the rift & spread is the crustal relaxation caused by a prior megathrust earthquake @ the Central America arc, & Backarc basin, Guatemala arc & range, & also the Chiapas arc & backarc basin, which was about 950AD & caused a major palaeo tsunami in New Zealand with a height of over 10m @ the time. As the crust is relaxed from this major megathrust event and is only slowly compressing (so far)@ the forearc & arc, equilibration results in a small amount of continuing backarc spread which continues right to the ex Cuba megathrust which is now a backarc backfault.
An interesting result this one as it is a mite bigger than the average cuba arc quake & therefore big enough to give a beachball diagram (handy).
Have a nice day: Ag
Thanks for the comment on the earthquake.
Edith

Fort Myers, FL

#4 Jan 13, 2014
Mannie wrote:
<quoted text>
Thanks for the comment on the earthquake.
www.mannieandcubanarejerks.com

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