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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.6 mag strikes near Ohara in Japan

Earthquake location 35.1704S, 140.6009WA light earthquake with magnitude 4.6 (ml/mb) was detected on Sunday, 21 kilometers (13 miles) from Ohara in Japan. The epicenter of the earthquake was roughly 38.05 km (24 miles) below the earth’s surface. Exact location of event, depth 38.05 km, 140.6009° East, 35.1704° North. Exact time and date of event in UTC/GMT: 21/10/18 / 2018-10-21 11:02:52 / October 21, 2018 @ 11:02 am. Event ids that are associated to the earthquake: us1000hf8e. Id of event: us1000hf8e. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The 4.6-magnitude earthquake was detected at 20:02:52 / 8:02 pm (local time epicenter).

Nearest city/cities or towns, with min 5000 pop, to epicentrum/hypocenter was Ushiku, Kamakura, Kashiwa. Close country/countries that might be effected, Japan (c. 127 288 000 pop). The epicenter was 92 km (57 miles) from Yokohama (c. 3 574 400 pop), 89 km (55 miles) from Kawasaki (c. 1 306 800 pop), 65 km (40 miles) from Chiba (c. 919 700 pop), 81 km (50 miles) from Funabashi (c. 560 700 pop), 93 km (58 miles) from Matsudo (c. 470 300 pop), 86 km (53 miles) from Yokosuka (c. 429 000 pop), 95 km (59 miles) from Kashiwa (c. 340 200 pop).

Each year there are an estimated 13,000 light quakes in the world. In the past 24 hours, there have been one, in the last 10 days three, in the past 30 days five and in the last 365 days sixty-one earthquakes of magnitude 3.0 or greater that have been detected nearby. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage.

Questions or comments?

Did objects rattle, topple over, or fall off shelves? Leave a comment or report about activity, shaking and damage at your home, country and city. 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: 21 km ESE of Ohara, Japan.

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More information

Parameter Value Description
Magnitude 4.6 mb The magnitude for the event.
Longitude 140.6009° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 35.1704° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 38.05 km Depth of the event in kilometers.
Place 21km ESE of Ohara, Japan Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2018-10-21 11:02:52 Time when the event occurred. UTC/GMT
Updated 2018-10-26 07:58:01 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 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 2.046 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.96 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 120 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 us1000hf8e Id of event.
Event Code 1000hf8e An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us1000hf8e, A comma-separated list of event ids that are associated to an event.

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