1) Electric and magnetic fields can be influenced by temperature. For example in the winter if you leave your lights on your car battery will drain faster than in the summer.
Why? Because, materials that are classed as CONDUCTORS tend to INCREASE their resistance with an increase in temperature. INSULATORS however are liable to DECREASE their resistance with an increase in temperature. Materials used for practical insulators (glass, plastic etc.) only exhibit a marked drop in their resistance at very high temperatures. They remain good insulators over all temperatures they are likely to encounter in use.
This is also related to why they recommend you store batteries in the refrigerator when not in use. The insulator will increase it’s resistance with the lower temperature and limit a non-use discharge over time.
As to the faucet - two possibilities. 1) is there any heating tape/coil on any of the pipes to prevent freezing? If so then it could be one has been nicked or worn. 2) given the earthquake you mentioned it could be that there is an electrical wire that is loose/nicked/worn near the water pipe.
Do you have an outlet near the sink at all? Does it have a GFCI (ground fault current interrupter) on it at either the outlet or the circuit panel? Not that that is the cause, but it would possibly limit any dangerous current on the kitchen electrical line from becoming dangerous - standard code these days in most places.
The problem was complained about in the summer of 2017. There had been a fair amount of rain and we do have a sump pump because of the high water table. However we also tested after a dry period as well. The problem is in the bathroom tub faucet. We do have GFI in both the bathroom and the kitchen but you cannot touch it and either the sink or tub faucet at the same time. More ideas???