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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.2 mag was detected near Oarai in Japan

Earthquake location 36.2262S, 140.9751WA light earthquake with magnitude 4.2 (ml/mb) was reported 35 kilometers (22 miles) from Oarai in Japan on Thursday. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Exact time and date of event in UTC/GMT: 03/01/18 / 2018-01-03 19:29:31 / January 3, 2018 @ 7:29 pm. The 4.2-magnitude earthquake was detected at 04:29:31 / 4:29 am (local time epicenter). Id of earthquake: us2000ckef. Event ids that are associated: us2000ckef. Exact location, longitude 140.9751° East, latitude 36.2262° North, depth = 35 km. The earthquake occurred at a depth of 35 km (22 miles) below the earth’s surface.

Epicenter of the earthquake was 92 km (57 miles) from Iwaki (c. 357 300 pop), 49 km (30 miles) from Mito-shi (c. 246 500 pop), 51 km (32 miles) from Hitachi (c. 186 300 pop), 88 km (54 miles) from Sakura (c. 182 500 pop), 79 km (49 miles) from Tsukuba (c. 175 600 pop), 44 km (27 miles) from Hitachi-Naka (c. 156 800 pop). Close country/countries, Japan (c. 127 288 000 pop) (That might be effected). Closest city/cities or villages, with min 5000 pop, to hypocenter/epicentrum was Tōgane, Mitsukaidō, Iwaki.

In the past 24 hours, there have been seven, in the last 10 days eight, in the past 30 days thirteen and in the last 365 days one hundred 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. Each year there are an estimated 13,000 light earthquakes in the world.

Questions or comments?

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 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: 35 km ESE of Oarai, Japan.

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More information

Parameter Value Description
Magnitude 4.2 mb The magnitude for the event.
Longitude 140.9751° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 36.2262° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 35 km Depth of the event in kilometers.
Place 35km ESE of Oarai, Japan Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2018-01-03 19:29:31 Time when the event occurred. UTC/GMT
Updated 2018-01-17 23:26:30 Time when the event was most recently updated. UTC/GMT
Timezone offset 540 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 271 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 1.646 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.72 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 156 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 us2000ckef Id of event.
Event Code 2000ckef An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us2000ckef, A comma-separated list of event ids that are associated to an event.

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