a Mag 1.7 near San Francisco, California
and a Mag 3.4 near Milpitas, California
Mag 1.7 near Mineral, California and close to Mount Lassen
"A lava dome, Lassen Peak has a volume of 0.6 cubic miles making it the largest lava dome on Earth. The volcano arose from the destroyed northern flank of now-collapsed Mount Tehama about 27,000 years ago, from a series of eruptions over the course of a few years. Since 25,000 years ago, the mountain has been significantly eroded by glaciers, and it is now covered in talus deposits." https://en.wikipedia.org/wiki/Lassen_Peak
"On May 22, 1915, a powerful explosive eruption at Lassen Peak devastated nearby areas, and spread volcanic ash as far as 280 miles to the east. This explosion was the most powerful in a series of eruptions from 1914 through 1917. Lassen Peak and Mount St. Helens were the only two volcanoes in the contiguous United States to erupt during the 20th century."
