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Minor earthquake 2.87 mag, 8 km NNE of Helena Valley Northwest, Montana



Earthquake location 46.7965S, -112.0126667WA minor earthquake magnitude 2.87 (ml/mb) strikes 8 kilometers (5 miles) from Helena Valley Northwest in Montana on Saturday. Event id: mb80100289. Ids that are associated to the earthquake: mb80100289. Exact location of event, depth 9.18 km, -112.0126667° West, 46.7965° North. Exact time and date of event in UTC/GMT: 04/10/15 / 2015-10-04 03:31:19 / October 4, 2015 @ 3:31 am. The temblor was reported at 21:31:19 / 9:31 pm (local time epicenter). The earthquake occurred at a depth of 9.18 km (6 miles).

Event epicenter was 23 km (14 miles) from Helena (c. 28 200 pop), 21 km (13 miles) from Helena Valley Southeast (c. 8 200 pop), 15 km (10 miles) from Helena Valley West Central (c. 7 900 pop). Nearest cities/city/towns to hypocenter/epicentrum was Helena, Helena Valley Southeast, Helena Valley West Central (min 5000 pop). Nearby country/countries that might be effected, United States (c. 310 233 000 pop).

Each year there are an estimated 1,300,000 minor earthquakes in the world. In the past 24 hours, there have been one, in the last 10 days one, in the past 30 days one and in the last 365 days four earthquakes of magnitude 3.0 or greater that have been detected in the same area. Earthquakes 2.5 to 2.9 are often felt, but only causes minor damage.

Did you feel it?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity 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: 8 km NNE of Helena Valley Northwest, Montana.

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More information

Parameter Value Description
Magnitude 2.87 mb The magnitude for the event.
Longitude -112.0126667° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 46.7965° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 9.18 km Depth of the event in kilometers.
Place 8km NNE of Helena Valley Northwest, Montana Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2015-10-04 03:31:19 Time when the event occurred. UTC/GMT
Updated 2015-10-04 16:18:51 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 127 A number describing how significant the event is. Larger numbers indicate a more significant event.
Network mb The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources ,mb, A comma-separated list of network contributors.
Number of Stations Used 34 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.151 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.21 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 171 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 mb80100289 Id of event.
Event Code 80100289 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,mb80100289, A comma-separated list of event ids that are associated to an event.

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