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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.2 mag has occurred near Itoman in Japan



Earthquake location 24.6993S, 127.6218WA light earthquake with magnitude 4.2 (ml/mb) was reported 157 km S of Itoman, Japan (98 miles) on Tuesday. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The 4.2-magnitude earthquake was detected at 01:06:27 / 1:06 am (local time epicenter). The earthquake occurred at a depth of 10 km (6 miles). Exact location of event, depth 10 km, 127.6218° East, 24.6993° North. Exact time and date of earthquake 23/10/17 / 2017-10-23 16:06:27 / October 23, 2017 @ 4:06 pm UTC/GMT. Id of earthquake: us1000az5y. Event ids that are associated: us1000az5y.

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

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. 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: 157 km S of Itoman, Japan.

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More information

Parameter Value Description
Magnitude 4.2 mb The magnitude for the event.
Longitude 127.6218° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 24.6993° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 10 km Depth of the event in kilometers.
Place 157km S of Itoman, Japan Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2017-10-23 16:06:27 Time when the event occurred. UTC/GMT
Updated 2017-11-06 18:29:05 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 2.207 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.91 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 94 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 us1000az5y Id of event.
Event Code 1000az5y An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us1000az5y, A comma-separated list of event ids that are associated to an event.

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