DISTANCE RELATIONS BETWEEN EARTHQUAKES

 

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)

 

Kermadec Islands to

Loyalty Islands to

Brazil to

Venezuela to Sumbawa, Java, Lombok, Indonesia, 

Fiji to

Lomboc, Indonesia to  Venezuela,

 

Outer shadow zone edge (141-148 degrees)

 

Kermadec Islands to Iceland, Crimea, 

Loyalty Islands to Turkey, Bosnia, 

Brazil to Honshu, Japan, Volcano Is, Mariana Islands, , 

Venezuela to Solomon Islands, Bonin Islands, Papua New Guinea, 

Fiji to England, 

Lomboc, Indonesia to Eastern Texas, Ohio, Kentucky, Guerrero, Mexico, Central Chile, Quebec, Canada, 

 

Node 3 (120 degrees)

 

Kermadec Islands to

Loyalty Islands to Ural Mts,

Brazil to Western Iran, Ural Mts,

Venezuela to Fiji, Hokkaido, Southern Kurils, 

Fiji to Puerto Rico, Virgin Is,

Lomboc, Indonesia to Central, northern California, 

 

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

 

Kermadec Islands to Arkansas, Ecuador,  Northern Alaska,

Loyalty Islands to Southwest Indian Ocean, Texas, South Sandwich Is, Ecuador, Kansas, Oklahoma, Tajikistan, Costa Rica, central, Northern Chile, eastern Mexico,  South Sandwich Is, 

Brazil to Southwest Indian Ocean, Turkey, Uganda, New Zealand, Fiji, Fox Islands, Aleutians,

Venezuela to Ural Mts, Andreanof Is, Northern Kamchatka, South of Africa, 

Fiji to Peru, Missouri, Ecuador, Colombia, Panama, Cayman Islands, South Sandwich Is, Brazil, Peru, Chile, Kentucky, 

Lomboc, Indonesia to Bosnia, South Sandwich Is, South Shetland Is, Germany, Northern Alaska, Arctic Ocean, Albania, Alaska, Italy, Southern Atlantic, Scotia Sea, Greenland Sea, South Sandwich Islands, Gulf of California,

 

Node 4 (90 degrees)

 

Kermadec Islands to California-Nevada border, 

Loyalty Islands to Southern, Central California, SE Alaska, 

Brazil to Hawaii,

Venezuela to

Fiji to Southern Chile, Northern Alaska, Mexico, Guatemala,

Lomboc, Indonesia to

 

Node 5 (72 degrees)

 

Kermadec Islands to

Loyalty Islands to

Brazil to North Atlantic, Oregon, 

Venezuela to South Shetland Islands, 

Fiji to Hokkaido, Fox Islands, Kurils,

Lomboc, Indonesia to

 

Node 6 (60 degrees)

 

Kermadec Islands to

Loyalty Islands to Central Philippines,

Brazil to Colorado, Azores, Southern, northern California, South Sandwich Islands,  

Venezuela to Kuril Islands, 

Fiji to Australia, Mindanao, Philippines, 

Lomboc, Indonesia to Honshu, Southern Kuril Islands,

 

Node 7 (52 degrees)

 

Kermadec Islands to Australia

Loyalty Islands to Southern Mindanao, Philippines, 

Brazil to Pennyslvania, South Sandwich Islands, 

Venezuela to Texas, Yellowstone, Northern Colorado, 

Fiji to Mariana Is,

Lomboc, Indonesia to Macquarie Island, Honshu, Japan, 

 

Node 8 (45 degrees)

 

Kermadec Islands to

Loyalty Islands to

Brazil to

Venezuela to

Fiji to

Lomboc, Indonesia to