When was the most recent earthquake near san francisco

1989, major earthquake which caused death of 63 nearly 3800 injuries.

Explanation:

Loma Prieta is the name given to the earthquake that struck the San Francisco Bay area on 17th October and an estimate of 6 billion dollar property loss. It was the strongest of the earthquake recorded since 1906. After this occurring on 5.04pm UTC. The shock was centered around the state park 16 kilometers of Santa Cruz, with a magnitude of 6.9. The depth of this earthquake creates a seismic gap, landslides and liquefaction became a significant issue. As this area already has a history of San Andreas fault, and its duration was about 8 to 15 seconds.

May consider a group  g=({0,1},+)g=({0,1},+)where  ++  will work as the xor operator like we work in boolean algebra. note here, that ‘00’ and ‘11’ are not the usual 0 and 1 that we work with everyday. the elements are  called  ‘00’ and ‘11’ and  may not mean  zero (nothing) and one (single). ‘00’ is the identity for the given binary operator +, meaning that any element operated with ‘00’ gets us that element itself.  for a set  ss  in  g′g′  having more elements than just  {0,1}{0,1}  the values for  a+b∈sa+b∈s, such that  a∈s,b∈sa∈s,b∈s, have to be first defined, only then can you determine the value of  1+11+1. the answer could possibly have been  22  if oanswer is25,000