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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.3 mag was detected near Onagawa Chō in Japan

Posted by admin on August 18, 2025 0 Comments

Earthquake location 37.424S, 144.5986WA light earthquake magnitude 4.3 (ml/mb) strikes 299 km ESE of Onagawa Chō, Japan (186 miles) on Wednesday. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Exact location, longitude 144.5986° East, latitude 37.424° North, depth = 10 km. The earthquake was roughly at a depth of 10 km (6 miles). The 4.3-magnitude earthquake was detected at 08:26:33 / 8:26 am (local time epicenter). Unique identifier: us6000qym8. Ids that are associated to the event: us6000qym8. Global date and time of event UTC/GMT: 23/07/25 / 2025-07-23 08:26:33 / July 23, 2025 @ 8:26 am.

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

Did you feel anything?

How did you respond? Did any furniture slide, topple over, or become displaced? Leave a comment or report about activity, shaking and damage at your home, city 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: 299 km ESE of Onagawa Chō, Japan.

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More information

Parameter Value Description
Magnitude 4.3 mb The magnitude for the event.
Longitude 144.5986° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 37.424° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 10 km Depth of the event in kilometers.
Place 299 km ESE of Onagawa Chō, Japan Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2025-07-23 08:26:33 Time when the event occurred. UTC/GMT
Updated 2025-08-18 13:15:56 Time when the event was most recently updated. UTC/GMT
Timezone offset 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 284 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 34 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 4.341 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 1.09 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 153 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 us6000qym8 Id of event.
Event Code 6000qym8 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us6000qym8, A comma-separated list of event ids that are associated to an event.

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