1/3: There is increased risk after a big earthquake, but it depends on location. Increase is highest at the fault that produced 1st quake & dies off with distance, time and magnitude. So immediately after a M3 (on a 10m fault) there is a tiny increase right at the site.
2/3: Immediately after a M8 on a 500 km fault, there is a big increase at the fault, that dies off with distance and approaches background around 3-4 times the fault length or something like 2000 km away. The Venezuela earthquake increased the risk in the southern Caribbean.
3/3: The M8.2 Fiji earthquake increased the risk for a section of the South Pacific - and we saw M6s in Indonesia, Vanuatu and New Guinea. The increase in number of quakes you saw does have a pattern - it just doesn’t extend to the US.
