Is this a natural quake, or is something afoot here, given the fact that the area is under fire (literally)? Several Ukiah residents located 15 km away reported feeling the quake that struck Redwood Valley.

M 3.9 - NORTHERN CALIFORNIA - 2017-10-13 23:10:31 UTC
CSEM / EMSC
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Magnitude Mw 3.9
Region NORTHERN CALIFORNIA
Date time 2017-10-13 23:10:31.9 UTC
Location 39.29 N ; 123.24 W
Depth 0 km

Distances 733 km NW of Los Angeles, United States / pop: 3,793,000 / local time: 16:10:31.9 2017-10-13
171 km NW of Sacramento, United States / pop: 467,000 / local time: 16:10:31.9 2017-10-13
16 km N of Ukiah, United States / pop: 16,100 / local time: 16:10:31.9 2017-10-13
4 km NW of Redwood Valley, United States / pop: 1,800 / local time: 16:10:31.9 2017-10-13

TESTIMONIES

Witness location : Ukiah (United States) (15 km S from epicenter)
Rolling with 1 North to South jerk

Witness location : Ukiah (United States) (15 km S from epicenter)
From where i was the building felt like it was swaying from south to north.

Witness location : Ukiah (United States) (15 km S from epicenter)
Mild to moderate shaking for 3 to 5 seconds

Witness location : Ukiah (United States) (18 km S from epicenter)
(V)Ery quick. Shook the dining table side to side.

Witness location : Crescent City (United States) (287 km NW from epicenter)
All dogs within hearing range randomly started barking.

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MENDOCINO-LAKE COMPLEX (2 fires)
CAL FIRE Incident Management Team assigned
Redwood Valley, Mendocino County
North of Hwy 20 in Potter Valley and Redwood Valley
34,000 acres, 10% contained
8 civilian fatalities
Significant structures destroyed

Cal Fire Summary Report