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Minor earthquake 2.8 mag, 25 km W of Helena, Oklahoma


Earthquake location 36.5584S, -98.5533WA minor earthquake magnitude 2.8 (ml/mb) has occurred on Monday, 25 kilometers (16 miles) from Helena in Oklahoma. Exact location of earthquake, longitude -98.5533 West, latitude 36.5584 North, depth = 5 km. The epicenter of the earthquake was roughly 5 km (3 miles) below the earth’s surface. Id of earthquake: us1000bl7u. Event ids that are associated: us1000bl7u. Global date and time of event UTC/GMT: 05/12/17 / 2017-12-05 00:31:59 / December 5, 2017 @ 12:31 am. The 2.8-magnitude earthquake was detected at 18:31:59 / 6:31 pm (local time epicenter).

The epicenter was 63 km (39 miles) from Enid (c. 49 400 pop), 76 km (47 miles) from Woodward (c. 12 100 pop). Close country/countries that might be effected, United States (c. 310 233 000 pop). Closest city/cities or villages, with min 5000 pop, to hypocenter/epicentrum was Woodward, Enid.

In the past 24 hours, there have been 0, in the last 10 days two, in the past 30 days six and in the last 365 days one hundred and fourty-six earthquakes of magnitude 3.0 or greater that has occurred nearby. Earthquakes 2.5 to 2.9 are often felt, but only causes minor damage. Every year there are an estimated 1,300,000 minor earthquakes in the world.

How would you describe the shaking?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity at your home, city and country. This information comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Date-Time, Location, Distances, Parameters and details about this quake, recorded: 25 km W of Helena, Oklahoma.

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More information

Parameter Value Description
Magnitude 2.8 mb The magnitude for the event.
Longitude -98.5533° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 36.5584° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 5 km Depth of the event in kilometers.
Place 25km W of Helena, Oklahoma Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2017-12-05 00:31:59 Time when the event occurred. UTC/GMT
Updated 2017-12-05 00:52:44 Time when the event was most recently updated. UTC/GMT
Timezone offset -360 Timezone offset from UTC in minutes at the event epicenter.
Felt The total number of felt reports
CDI The maximum reported intensity for the event.
MMI 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 121 A number describing how significant the event is. Larger numbers indicate a more significant event.
Network us The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources ,us, A comma-separated list of network contributors.
Number of Stations Used The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.171 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.4 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 76 The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type mb_lg The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID us1000bl7u Id of event.
Event Code 1000bl7u An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us1000bl7u, A comma-separated list of event ids that are associated to an event.

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