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Light World Earthquakes Magnitude 4-4.9

Light earthquake: M4.1 quake has struck near Maindong in China

Earthquake location 33.1185S, 86.8138WA light earthquake with magnitude 4.1 (ml/mb) was detected on Wednesday, 237 km NNE of Maindong, China (147 miles). Unique identifier: us20002z3a. Ids that are associated to the event: us20002z3a. The temblor was reported at 07:35:05 / 7:35 am (local time epicenter). The earthquake occurred at a depth of 43.72 km (27 miles). Date and time of earthquake in UTC/GMT: 21/07/15 / 2015-07-21 23:35:05 / July 21, 2015 @ 11:35 pm. Exact location of earthquake, 86.8138° East, 33.1185° North, depth 43.72 km. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist).

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 two 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 quakes in the world each year.

Did you feel it?

Were you asleep? Was it difficult to stand and/or walk? Leave a comment or report about shaking, activity and damage at your city, home and country. 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: 237 km NNE of Maindong, China.

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More information

Parameter Value Description
Magnitude 4.1 mb The magnitude for the event.
Longitude 86.8138° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 33.1185° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 43.72 km Depth of the event in kilometers.
Place 237km NNE of Maindong, China Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2015-07-21 23:35:05 Time when the event occurred. UTC/GMT
Updated 2015-08-11 22:57:01 Time when the event was most recently updated. UTC/GMT
Timezone offset 480 Timezone offset from UTC in minutes at the event epicenter.
Felt 0 The total number of felt reports
CDI 1 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 259 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 5.018 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 1.38 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 109 The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type mb The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID us20002z3a Id of event.
Event Code 20002z3a An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us20002z3a, A comma-separated list of event ids that are associated to an event.

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