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Light World Earthquakes Magnitude 4-4.9

Light earthquake: M4.2 quake has struck near Yonakuni in Japan

Earthquake location 23.9572S, 122.4579WA light earthquake magnitude 4.2 (ml/mb) has struck on Saturday, 78 kilometers (48 miles) from Yonakuni in Japan. Exact location, longitude 122.4579° East, latitude 23.9572° North, depth = 10 km. The temblor was reported at 14:33:17 / 2:33 pm (local time epicenter). All ids that are associated to the event: us1000c225. Unique identifier: us1000c225. Exact time and date of event in UTC/GMT: 23/12/17 / 2017-12-23 06:33:17 / December 23, 2017 @ 6:33 am. The epicenter was at a depth of 10 km (6 miles). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist).

Epicenter of the earthquake was 87 km (54 miles) from Hualian (c. 350 500 pop). Country/countries that might be effected, Taiwan (c. 22 894 000 pop). Closest city/cities/towns to epicentrum/hypocenter was Hualian (min 5000 pop).

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

How would you describe the shaking?

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: 78 km SW of Yonakuni, Japan.

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More information

Parameter Value Description
Magnitude 4.2 mb The magnitude for the event.
Longitude 122.4579° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 23.9572° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 10 km Depth of the event in kilometers.
Place 78km SW of Yonakuni, Japan Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2017-12-23 06:33:17 Time when the event occurred. UTC/GMT
Updated 2018-01-20 10:09:07 Time when the event was most recently updated. UTC/GMT
Timezone offset 480 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 0.716 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.56 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 104 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 us1000c225 Id of event.
Event Code 1000c225 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us1000c225, A comma-separated list of event ids that are associated to an event.

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