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Light earthquake, 4.46 mag strikes near Humboldt Hill in CA


Earthquake location 40.7463341S, -124.3613358WA light earthquake with magnitude 4.46 (ml/mb) was detected on Thursday, 15 kilometers (9 miles) from Humboldt Hill in CA. Exact time and date of earthquake 22/03/18 / 2018-03-22 16:24:49 / March 22, 2018 @ 4:24 pm UTC/GMT. The epicenter was at a depth of 19.23 km (12 miles). A tsunami warning has been issued near Humboldt Hill in CA (Does not indicate if a tsunami actually did or will exist). Unique identifier: nc72988726. Ids that are associated to the event: nc72988726, at00p602xd, us1000d7jk. Exact location of event, depth 19.23 km, -124.3613358° West, 40.7463341° North. The temblor was reported at 08:24:49 / 8:24 am (local time epicenter).

Close country/countries that might be effected, United States (c. 310 233 000 pop). Nearest city/cities or towns, with min 5000 pop, to epicentrum/hypocenter was McKinleyville, Bayside, Arcata. Event epicenter was 18 km (11 miles) from Eureka (c. 27 200 pop), 27 km (17 miles) from Arcata (c. 17 200 pop), 27 km (17 miles) from Bayside (c. 17 100 pop), 31 km (19 miles) from McKinleyville (c. 15 200 pop), 24 km (15 miles) from Fortuna (c. 11 900 pop).

In the past 24 hours, there have been one, in the last 10 days two, in the past 30 days four and in the last 365 days thirty-eight earthquakes of magnitude 3.0 or greater that has occurred nearby. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. There are an estimated 13,000 light earthquakes in the world each year.

Did you feel anything?

Did objects rattle, topple over, or fall off shelves? Leave a comment or report about activity, shaking and damage at your home, country and city. This data comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, that has occurred near: 15 km W of Humboldt Hill, CA.

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More information

Parameter Value Description
Magnitude 4.46 mb The magnitude for the event.
Longitude -124.3613358° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 40.7463341° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 19.23 km Depth of the event in kilometers.
Place 15km W of Humboldt Hill, CA Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2018-03-22 16:24:49 Time when the event occurred. UTC/GMT
Updated 2018-03-22 16:41:04 Time when the event was most recently updated. UTC/GMT
Timezone offset -480 Timezone offset from UTC in minutes at the event epicenter.
Felt 196 The total number of felt reports
CDI 4.5 The maximum reported intensity for the event.
MMI 4.62 The maximum estimated instrumental intensity for the event.
Alert Level green 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 1 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 394 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,at,us, A comma-separated list of network contributors.
Number of Stations Used 38 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.2618 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.12 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 202 The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type mw The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID nc72988726 Id of event.
Event Code 72988726 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,nc72988726,at00p602xd,us1000d7jk, A comma-separated list of event ids that are associated to an event.

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