The latest earthquake to hit Humboldt County was initially reported to have a magnitude of 4.4 on the Richter Scale. That estimate changed to 4.6 within a few minutes. Absolutely no reports of damage or injuries were heard on scanner traffic, and it was barely noticeable in Eureka. One person in the office felt it, another didn’t. It hit at 12:46 a.m. local time and was centered approximately 22 miles due West (offshore) of Petrolia.
|Depth||12.5 km (7.8 miles)|
|Region||OFFSHORE NORTHERN CALIFORNIA|
|Location Uncertainty||horizontal +/- 0.7 km (0.4 miles); depth +/- 0.5 km (0.3 miles)|
|Parameters||Nph= 36, Dmin=35 km, Rmss=0.06 sec, Gp=238°,
M-type=regional moment magnitude (Mw), Version=4