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)

Coast of Northern California to Southern Indian Ocean

Vanuatu to Atlantic Ocean west of northern Africa

Kyushu to

Cayman Island to South of Sumatra

TC Alfred to Canary Is, Azores, North Atlantic, 

TC Ivone to Mexico, Guatemala, 

Jan Mayen to

Outer shadow zone edge (141-148 degrees)

Coast of Northern California to Comores Islands,

Vanuatu to  Greece, Italy, Crete, Macedonia, North Atlantic Ridge, France, 

Nepal to coast of Mexico, Galapagos, Pacific-Antarctic Ridge, Costa Rica, Ecuador

Kyushu to Central Peru, Central Atlantic, South Atlantic,  

Cayman Islands to Mindanao, North of North Island, Kermadec Is. Fiji, Tonga, New Zealand, Myanmar, Mindanao, Talaud, Halmahera, Indonesia, south Australia

TC Alfred to Italy, Iceland, Quebec, Puerto Rico, Virgin Islands,

TC Ivone to Northern California, Vancouver, 

Jan Mayen to

Node 3 (120 degrees)

Coast of Northern California to Sumatra, Balleny Is, Sumba, Bali, South Georgia, Java, Nicobar Islands, Sumatra, 

Vanuatu to Serbia, Svalbard, Yemen, New York, Indian Ocean, Greenland Sea, Iran, Northern Colombia, Quebec,  

Nepal to northern Baja California, Mexico, western Texas, Alabama, Mississippi, New Mexico, Baja, northern Gulf of California,

Kyushu to Nicaragua, North Atlantic, Honduras, Guatemala, Vancouver, East Pacific Rise,

Cayman Islands to Xizang, Pakistan, Afghanistan, Yemen, Ethiopia, Solomon Is, New Ireland/New Britain, Kyushu, Japan

TC Alfred to Oklahoma, Armenia, El Salvador, Peru, Chiapas, Guatemala, Iran, Southern Texas, Kansas,   

TC Ivone to

Jan Mayen to

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

Coast of Northern California to Celebes, Turkmenistan, Assam, India, China, Iran, Mid-Atlantic, New Zealand, Myanmar, Ceram, Halhahera, Molucca, Cyprus, Crete, Greece, Ceram, Christchurch, New Zealand, Molucca, Afghanistan, Caucasus, Irian Jaya, Mindanao,  

Vanuatu to Peru, Western Texas, Missouri, Kyrgyzstan, Scotia Sea, Central Chile, Arctic Ocean, Pakistan, Xinjiang, China, Oaxaca, Chiapas, Mexico, Guatemala, Tajikistan, South of Africa, South Sandwich Islands, Uzbekistan, Pakistan, Mexico, Oklahoma, Hindu Kush,

Nepal to Nova Scotia, Quebec-Ontario, Maine, Oregon, Washington State, Montana, Northern Mid-Atlantic, Tonga/Fiji, Saskatchewan, Canada, South Island, New Zealand, Southern Mid-Atlantic Ridge, Coast of Oregon, Maine, Yellowstone, New York, Ontario,  Idaho, South Island, New Zealand, Kermadec, Tonga, Fiji, Balleny Islands, San Francisco, CA., Michigan, New Hampshire, Hawaii, Samoa, Tonga, Fiji, New Zealand, Quebec, Yellowstone, Idaho, 

Kyushu to Jalisco, Michoacan, Mexico, North Atlantic, Madeira Islands, Tennessee, North Carolina, western Mexico, Missouri, Pennyslvania, 

Cayman Islands to South of Africa, Southern Kuril Islands, Hokkaido, Northern Honshu, Japan,  north of North Island, Kermadec Is, New Zealand, Tonga/Fiji, Angola, Israel, Jordan, eastern TurkeyCaucasus, Mongolia, Sea of Japan, Sakhalin.

TC Alfred to Vancouver Island, Washington State, San Francisco, Gulf of California, Baja, southern California, Bio Bio, Chile, Southern Alaska,  

TC Ivone to Jan Mayen,

Jan Mayen to

Node 4 (90 degrees)

Coast of Northern California to Algeria, New Guinea, Romania, Kermadec Is. New Ireland, Algeria, Central Chile, Spain, Taiwan, Algeria, Morocco, China, Bismarck Sea, Serbia, New Guinea, Central Mid-Atlantic

Vanuatu to Washington State, Gulf of California, Central China, Revillo Gigedo Island, Mexico, Jalisco, Mexico, Nevada, Nepal, Arizona, Oregon, Northern, Central East Pacific Rise, Nepal, Utah, Gulf of California, 

Nepal to Azores, 

Kyushu to Reykjanes Ridge, France, Imperial, Baja, California, Utah, Arizona

Cayman Islands to Western Turkey,  Dodecanese Islands, Greece,  Kamchatka, Samoa, 

TC Alfred to

TC Ivone to Fiji, Tonga, 

Jan Mayen to

Node 5 (72 degrees)

Coast of Northern California to England, Azores, Tokyo, Japan, Tonga, Samoa, North Sea, Southern Peru, Siberia

Vanuatu to Fox Islands, Aleutians, Laos, Sumatra, 

Nepal to Iceland, Andreanof, Rat Islands, Northern Australia,  New Guinea, New Britain, Portugal

Kyushu to Nunavit, Tonga/Fiji, Jan Mayen, 

Cayman Islands to Unimak Island, Alaska, Bering Sea, Arctic Ocean, Central Mid-Atlantic, Sicily, Malta,

TC Alfred to

TC Ivone to

Jan Mayen to

Node 6 (60 degrees)

Coast of Northern California to Jan Mayen, Southern Kuril Islands, Colombia, Ecuador, northern Peru

Vanuatu to Honshu, Japan, Kuril Islands, Taiwan, Sumatra, Pacific-Antarctic Ridge, Java, Kyushu, Japan,  

Nepal to New Guinea, Norway, Italy, Guam, North Pole, Norwegian Sea, Greenland Sea,  

Kyushu to Vanuatu, Turkmenistan,

Cayman Islands to Central Mid-Atlantic, eastern Alaska, Chile Rise, Gulf of Alaska, Iceland, Araucania, Chile, 

TC Alfred to Taiwan, Sumatra, south of Honshu, 

TC Ivone to

Jan Mayen to Puerto Rico, Northern, Central California,

Node 7 (52 degrees)

Northern California to coast of Panama, Dominican Republic, Puerto Rico, Kamchatka, South of Panama

Vanuatu to Mindanao, Minahasa, Hawaii, South of Australia, Bonin/Izu Islands, Japan,

Nepal to Ukraine, Kuril Islands, Quebec, Bonin Islands, Crete, Greece, Mariana Is., Izu Islands, Japan, Timor, Mariana Islands, 

Kyushu to Alaska Peninsula, So. Sumatra, Tennant Creek, Solomon Islands, Northern Australia,

Cayman Islands to Coquimbo,  Central Chile, SE Alaska, Yukon, Canada, Azores, ,

TC Alfred to

TC Ivone to Central Philippines,

Jan Mayen to