Local News 3.9 Earthquake in Redwood Valley Mendocino County Public Broadcasting | By Jeff Zolitor Published October 13, 2017 at 5:38 PM PDT Facebook Twitter LinkedIn Email M 3.9 - 3km NW of Redwood Valley, CaliforniaTime 2017-10-13 23:10:31 (UTC)Location 39.287°N 123.237°WDepth -0.5 km