Minor earthquake, 3.49 mag strikes near Petrolia in CA

A minor earthquake with magnitude 3.49 (ml/mb) was reported 25 kilometers (16 miles) from Petrolia in CA on Thursday. All ids that are associated to the event: nc72940181. Unique identifier: nc72940181. The earthquake occurred at a depth of 18.29 km (11 miles) below the earth’s surface. Exact time and date of event in UTC/GMT: 15/12/17 / 2017-12-15 06:47:39 / December 15, 2017 @ 6:47 am. Exact location of event, depth 18.29 km, -124.5413361° West, 40.4368324° North. The 3.49-magnitude earthquake has occurred at 22:47:39 / 10:47 pm (local time epicenter).

Closest city/cities/towns to epicentrum/hypocenter was McKinleyville, Arcata, Bayside (min 5000 pop). Close country/countries that might be effected, United States (c. 310 233 000 pop). Epicenter of the event was 52 km (32 miles) from Eureka (c. 27 200 pop), 61 km (38 miles) from Arcata (c. 17 200 pop), 60 km (38 miles) from Bayside (c. 17 100 pop), 68 km (42 miles) from McKinleyville (c. 15 200 pop), 37 km (23 miles) from Fortuna (c. 11 900 pop).

In the past 24 hours, there have been one, in the last 10 days three, in the past 30 days three and in the last 365 days thirty-eight earthquakes of magnitude 3.0 or greater that was reported nearby. Earthquakes 3.0 to 4.0 are often felt, but only causes minor damage. There are an estimated 130,000 minor quakes in the world each year.

Questions or comments?

How did you react? Was there any damage to buildings? Leave a comment or report about shaking, activity and damage at your home, city and country. The information in this article comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, detected near: 25 km WNW of Petrolia, CA.

More information

Parameter	Value	Description
Magnitude	3.49 mb	The magnitude for the event.
Longitude	-124.5413361° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	40.4368324° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	18.29 km	Depth of the event in kilometers.
Place	25km WNW of Petrolia, CA	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2017-12-15 06:47:39	Time when the event occurred. UTC/GMT
Updated	2017-12-15 06:57:47	Time when the event was most recently updated. UTC/GMT
Timezone offset	-480	Timezone offset from UTC in minutes at the event epicenter.
Felt	46	The total number of felt reports
CDI	3.2	The maximum reported intensity for the event.
MMI	2.75	The maximum estimated instrumental intensity for the event.
Alert Level		The alert level from the PAGER earthquake impact scale. Green, Yellow, Orange or Red.
Review Status	reviewed	Indicates whether the event has been reviewed by a human.
Tsunami	0	This flag is set to "1" for large events in oceanic regions and "0" otherwise. The existence or value of this flag does not indicate if a tsunami actually did or will exist.
SIG	202	A number describing how significant the event is. Larger numbers indicate a more significant event.
Network	nc	The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources	,nc,	A comma-separated list of network contributors.
Number of Stations Used	28	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.1603	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.1 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	227	The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type	ml	The method or algorithm used to calculate the preferred magnitude for the event.
Event Type	earthquake	Type of seismic event.
Event ID	nc72940181	Id of event.
Event Code	72940181	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,nc72940181,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake, 3.49 mag strikes near Petrolia in CA

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