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Minor earthquake, 2.8 mag strikes near Helena Valley Northwest in Montana



Earthquake location 46.7201S, -112.086WA minor earthquake with magnitude 2.8 (ml/mb) was detected on Saturday, 2 kilometers (1 miles) from Helena Valley Northwest in Montana. Exact location, longitude -112.086° West, latitude 46.7201° North, depth = 6.32 km. The 2.8-magnitude earthquake was detected at 01:42:46 / 1:42 am (local time epicenter). Date and time of earthquake in UTC/GMT: 17/10/15 / 2015-10-17 07:42:46 / October 17, 2015 @ 7:42 am. The epicenter was at a depth of 6.32 km (4 miles). All ids that are associated to the event: us10003pbh. Unique identifier: us10003pbh.

Closest city/cities/towns to epicentrum/hypocenter was Helena Valley Southeast, Helena, Helena Valley West Central (min 5000 pop). Nearby country/countries that might be effected, United States (c. 310 233 000 pop). Earthquake epicenter was 15 km (9 miles) from Helena (c. 28 200 pop), 17 km (11 miles) from Helena Valley Southeast (c. 8 200 pop), 7 km (4 miles) from Helena Valley West Central (c. 7 900 pop).

Earthquakes 2.5 to 2.9 are often felt, but only causes minor damage. There are an estimated 1,300,000 minor earthquakes in the world each year. In the past 24 hours, there have been one, in the last 10 days one, in the past 30 days two and in the last 365 days three earthquakes of magnitude 3.0 or greater that has struck near.

How would you describe the shaking?

How did you respond? Did any furniture slide, topple over, or become displaced? Leave a comment or report about activity, shaking and damage at your home, city and country. Read more about the earthquake, Distances, Seismometer information, Date-Time, Parameters, Location and details about this quake, that has struck: 2 km WSW of Helena Valley Northwest, Montana. This data comes from the USGS Earthquake Notification Service.

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More information

Parameter Value Description
Magnitude 2.8 mb The magnitude for the event.
Longitude -112.086° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 46.7201° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 6.32 km Depth of the event in kilometers.
Place 2km WSW 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 2015-10-17 07:42:46 Time when the event occurred. UTC/GMT
Updated 2015-10-17 08:35:34 Time when the event was most recently updated. UTC/GMT
Timezone offset -360 Timezone offset from UTC in minutes at the event epicenter.
Felt 1 The total number of felt reports
CDI 3.8 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 0.175 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.38 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 77 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 us10003pbh Id of event.
Event Code 10003pbh An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us10003pbh, A comma-separated list of event ids that are associated to an event.

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