Natural History Wanderings

3:20 am this morning I felt an earthquake. I live in Berkeley about 25 miles from the epicenter of the quake. It had a rolling quality and didn’t feel very strong compared to some quakes based in Berkeley that were only 4.0 so I didn’t think it was that strong. An hour later I got up, looked on the internet and was surprised to find that it was a 6.0 quake with some injuries and damage. There are many stories about the quake on the web so I won’t repeat information about the damage and injuries. What you may not have seen is which fault it actually was (not yet absolutely clear yet) and what causes a quake. You can read about that at What Caused California’s Napa Valley Earthquake? Faults Explained