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Light World Earthquakes Magnitude 4-4.9

Light earthquake 4.6 mag, 238 km N of Chichi-shima, Japan


Earthquake location 29.2066S, 142.5818WA light earthquake with magnitude 4.6 (ml/mb) was detected on Friday, 238 km N of Chichi-shima, Japan (148 miles). The epicenter of the earthquake was roughly 10 km (6 miles) below the earth’s surface. Exact time and date of event in UTC/GMT: 21/12/17 / 2017-12-21 21:44:28 / December 21, 2017 @ 9:44 pm. The temblor was picked up at 07:44:28 / 7:44 am (local time epicenter). Exact location of event, longitude 142.5818 East, latitude 29.2066 North, depth = 10 km. Unique identifier: us1000c135. Ids that are associated to the event: us1000c135. 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 seven, in the last 10 days seven, in the past 30 days ten and in the last 365 days nineteen earthquakes of magnitude 3.0 or greater that has struck near. 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 anything?

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. 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: 238 km N of Chichi-shima, Japan.

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More information

Parameter Value Description
Magnitude 4.6 mb The magnitude for the event.
Longitude 142.5818° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 29.2066° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 10 km Depth of the event in kilometers.
Place 238km N of Chichi-shima, Japan Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2017-12-21 21:44:28 Time when the event occurred. UTC/GMT
Updated 2018-01-06 04:28:47 Time when the event was most recently updated. UTC/GMT
Timezone offset 600 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 326 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 2.132 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.69 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 154 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 us1000c135 Id of event.
Event Code 1000c135 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us1000c135, A comma-separated list of event ids that are associated to an event.

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