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Light World Earthquakes Magnitude 4-4.9

Light earthquake 4.5 mag, 223 km SE of Hachijo-jima, Japan


Earthquake location 31.4992S, 141.2638WA light earthquake magnitude 4.5 (ml/mb) has struck on Friday, 223 km SE of Hachijo-jima, Japan (139 miles). Global time and date of event 21/07/17 / 2017-07-21 01:24:08 / July 21, 2017 @ 1:24 am UTC/GMT. The epicenter of the earthquake was roughly 40.75 km (25 miles) below the earth’s surface. All ids that are associated to the event: us2000a1bi. Unique identifier: us2000a1bi. Exact location of earthquake, 141.2638° East, 31.4992° North, depth 40.75 km. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The 4.5-magnitude earthquake has occurred at 10:24:08 / 10:24 am (local time epicenter).

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 twenty-one 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. Every year there are an estimated 13,000 light earthquakes in the world.

Questions or comments?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity at your home, city and country. This data comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, that has occurred near: 223 km SE of Hachijo-jima, Japan.

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More information

Parameter Value Description
Magnitude 4.5 mb The magnitude for the event.
Longitude 141.2638° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 31.4992° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 40.75 km Depth of the event in kilometers.
Place 223km SE of Hachijo-jima, Japan Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2017-07-21 01:24:08 Time when the event occurred. UTC/GMT
Updated 2017-08-17 04:41:32 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 312 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 2.025 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.44 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 173 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 us2000a1bi Id of event.
Event Code 2000a1bi An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us2000a1bi, A comma-separated list of event ids that are associated to an event.

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