I was awake in Sunnyvale around 3 am during the 6.0 “Napa Earthquake” (officially the “American Canyon Earthquake”.)
I knew immediately it was over 5.0 because the walls were moving and groaning, for about 30 seconds.
Napa suffered almost 200 injuries and several historic brick buildings were heavily damaged due to the shallow quake only a few miles away. 911 was briefly overwhelmed, 64,000 were left without power and fire broke out.
Thousands of bottles and barrels of wine fell down.