Statistical evidence indicates that some triggering or promotion forward in time can occur in regions which are under high stress due to additional stress events of  small size. Among these are surface and body waves passing through a region. Triggering may be dynamic with the promoted earthquake occurring at the same time as the stress event or delayed with an earthquake occurring later in time but still related to the stress event through water lubrication or other various geophysical effects on the faults. We have argued in this report for the past 35 years that this effect is most observable where the seismic waves are largest. In general this occurs at distances from the rupture ends of  the earthquake producing those waves (mainshock) which we have termed nodal distances. These are defined by the formula D=360*m/n where D is the distance in degrees and m<=m where n an m are small integers. These are also the locations of  the maximum corrections to magnitude in the standard Jeffreys-Bullen tables. In addition there is focusing of  seismic energy from reflections and refractions of f the core-mantle and the inner-outer core boundary of  the earth. This focuses energy at the surface in the distance between 101 and 108 degrees (core-mantle) and 141-148 degrees (inner-outer core boundary). In this report we monitor seismicity at these distances following major earthquakes as experience has shown that strong and/or unusual earthquake are much more likely to occur at these distance from the mainshock.


Antipodal (~180 degrees)


Honduras to

Southern Peru to


Outer shadow zone edge (141-148 degrees)


Honduras to Myanmar, Banda, Molucca, Central Philippines, 

Southern Peru to Tajikistan, NE China, Hindu Kush, Siberia, 


Node 3 (120 degrees)


Honduras to Northern Mariana Islands, Southern Iran, Hindu Kush, Tajikistan, Bonin Is,  Kyushu, Tajikistan,  

Southern Peru to


P- and S- shadow zone edge and node 7 (101-110 degrees)


Honduras to Tonga, Kermadec Islands, Kurils,  Iran-Iraq border, Fiji, North Is. New Zealand, Fiji, Tonga,  Hokkaido, Japan, 

Southern Peru to Tonga, Bering Sea, Greece, Arctic Ocean, Unimak Is, Hungary, Crete,  Andreanof Islands, 


Node 4 (90 degrees)


Honduras to Greece,

Southern Peru to Iceland,


Node 5 (72 degrees)


Honduras to Arctic Ocean,

Southern Peru to Northern California,


Node 6 (60 degrees)


Honduras to

Southern Peru to Colorado, Southern California


Node 7 (52 degrees)


Honduras to

Southern Peru to


Node 8 (45 degrees)


Honduras to

Southern Peru to