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Last Week's Sumatra Quake Triggering Global Swarm of Strong Quakes - Could Trigger Santorini: sitting on Critical Geo-node
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Original Message
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IT’S THE SEVENTH NODE FROM SUMATRA
In our summary yesterday we noted that the earthquakes at the fifth node (72, 144 degrees) were occurring at large magnitude in Chile and Greece.
Seismicity switched from the fifth node to the seventh node and the edge of the seismic shadow zone associated with wave returns from the core-mantle boundary (52, 103, 155 degrees).
The strongest of these was an M 6.8 aftershock in the Papua New Guinea area (52-54 degrees from Sumatra) while the most unusual was an M 6.2-6.4 in the South Atlantic Ocean east of the South Sandwich Islands (103 degrees from Sumatra).
Readers may recall that immediately following the Sumatra earthquake an M 6.7 hit Michoacan, Mexico at the seventh node (154.5 degrees) from Sumatra.
A number of years ago we introduced the idea that strong wave concentration at about 103 degrees from major earthquakes after reflection and refraction off the core-mantle boundary could promote seismicity in this distance zone. This has been called the P103 theory by netizens.
Today we can add some fuel to this theory.
The strong earthquake, the first of this magnitude in more than two decades in the South Atlantic within 200 km of the epicenter was located at 103 degrees from three major earthquakes of the past week.
It was at 102 degrees from the M 8.6 in Sumatra; at 103 degrees from the Michoacan, Mexico quake of April 11 and at 102 degrees from the Vanuatu earthquake of M 6.6 of April 14.
The combination of effects from these three events probably softened this aseismic area to the point of a major rupture.
The earthquake in Papua New Guinea is likewise located at 102 degrees from the M 6.9 in the Gulf of California which occurred on April 12.
We are in a fortunate period for seeing these effects, especially if they are due to a combination of energies as appears likely.
Since the Sumatra earthquake there have been an unprecedented series of strong earthquakes around the world, most of which have struck at nodal distances from Sumatra.
These include the South Atlantic event and the Papua New Guinea (M 6.8) today; the earthquake of M 6.7 in Chile yesterday; an M 6.5 in Vanuatu on April 14 and earthquakes in Michoacan (M 6.7), the Drake Passage, the Gulf of California (M 6.9) in the period April 11-14.
For comparison there were no earthquakes of M>6.2 located in the world between March 26 and April 10 and eleven such events from April 11 through April 17.
Five earthquakes of M>6.2 were located in the world during the entire month of March.
There must be a strong suspicion that the unprecedented strike-slip earthquakes in Sumatra were the factor which brought on this seismic spasm in the earth.
If this is accepted, the entire field of long-distance triggering must be accepted as legitimate research.
[link to www.earthquakesummary.info]
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