A significant escalation is occurring at the Puerto Rico Subduction Zone. A swarm of quakes continue with close to one hundred quakes in just the last three days. What is most alarming is the increase in magnitudes. When a swarm starts to hit a series of high 3's and into 4's magnitude, it trips a geological/seismological switch often elevating an 'observation' into a 'watch'. (see EQ link below)
If the earthquake swarm maintains magnitude 4's, it is likely that a "warning" will be issued. In what might be considered a 'unique' situation, it would be rare to call for evacuation of an area based on earthquake foreshocks. However, with current technology and a better understanding of earthquake patterns, I would not be surprised if Puerto Rico and Caribbean Islands are put on alert.
What is being outlined above very much resembles the procedures of volcanic escalation which uses color codes and levels describing each position of elevation. If this occurs, it will be the first time measuring seismic escalation was used to foretell a large/mega earthquake event.
Volcanic Color Codes/Levels: http://www.earthchangesmedia.com/images/volcanic_color_code.jpg
It is not typical to witness an earthquake 'swarm' with high-moderate magnitude events. They are usually in the magnitude 1, 2, 3 range. Take a look below at what is happening right now on the Puerto Rico Subduction Zone. I will present two links. The World EQ's - Past 7 days and the Puerto Rico Region.
1) World Earthquakes Last 7 Days: http://earthquake.usgs.gov/eqcenter/recenteqsww/Quakes/quakes_all.html
2) Puerto Rico Region: http://earthquake.usgs.gov/eqcenter/recenteqsww/Maps/10/295_20_eqs.php
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