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05-12-2015, 09:04 PM
Hi Brian,
while I would like Kathy to filter the information she supplies more, I think there is at least a minor influence of Great quakes (and maybe high-end Major quake) at great distances. For example, seismic waves from Denali in Alaska I think is known to have triggered small quakes in the continental USA. Great quakes, and especially M9 quakes, ring the earth like a bell (free earth oscillations). I suppose the effect of this for triggering is extremely weak or nil. It has been a long time since I looked at this, but I recall there that there were two M8+quakes on the same day in 1905 (?). Yes, I know, statistics of small numbers.
With work by Roger, about a decade ago we looked into whether there is triggering at certain angular distances. The answer seemed to be "no" although there was something that I recall stood out a little bit at something like 103 (?) degrees. This investigation was related to Lowell Whiteside's Ph.D thesis.
Chris
while I would like Kathy to filter the information she supplies more, I think there is at least a minor influence of Great quakes (and maybe high-end Major quake) at great distances. For example, seismic waves from Denali in Alaska I think is known to have triggered small quakes in the continental USA. Great quakes, and especially M9 quakes, ring the earth like a bell (free earth oscillations). I suppose the effect of this for triggering is extremely weak or nil. It has been a long time since I looked at this, but I recall there that there were two M8+quakes on the same day in 1905 (?). Yes, I know, statistics of small numbers.
With work by Roger, about a decade ago we looked into whether there is triggering at certain angular distances. The answer seemed to be "no" although there was something that I recall stood out a little bit at something like 103 (?) degrees. This investigation was related to Lowell Whiteside's Ph.D thesis.
Chris