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

Posted by admin on May 15, 2025 0 Comments

Earthquake location 38.4027S, 141.3992WA light earthquake with magnitude 4.2 (ml/mb) was reported 6 kilometers (4 miles) from Onagawa Chō in Japan on Tuesday. Exact location, longitude 141.3992° East, latitude 38.4027° North, depth = 63.303 km. Date and time of earthquake in UTC/GMT: 29/04/25 / 2025-04-29 17:30:34 / April 29, 2025 @ 5:30 pm. Event id: us7000pzdr. Ids that are associated to the earthquake: us7000pzdr. 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 17:30:34 / 5:30 pm (local time epicenter). The epicenter of the earthquake was roughly 63.303 km (39 miles) below the earth’s surface.

Epicenter of the earthquake was 48 km (30 miles) from Sendai-shi (c. 1 063 100 pop), 49 km (31 miles) from Sendai (c. 1 063 100 pop), 92 km (57 miles) from Yamagata-shi (c. 254 500 pop), 9 km (5 miles) from Ishinomaki (c. 117 200 pop), 43 km (27 miles) from Furukawa (c. 76 300 pop), 90 km (56 miles) from Tendō (c. 65 400 pop). Nearest cities/city/villages to epicentrum/hypocenter was Yanagawamachi-saiwaichō, Yamagata-shi, Tendō (min 5000 pop). Close country/countries that might be effected, Japan (c. 127 288 000 pop).

Each year there are an estimated 13,000 light quakes in the world. In the past 24 hours, there have been two, in the last 10 days four, in the past 30 days six and in the last 365 days fifty-one 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?

How did you react? Was there any damage to buildings? Leave a comment or report about shaking, activity and damage 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: 6 km SW of Onagawa Chō, Japan.

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More information

Parameter Value Description
Magnitude 4.2 mb The magnitude for the event.
Longitude 141.3992° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 38.4027° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 63.303 km Depth of the event in kilometers.
Place 6 km SW 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 2025-04-29 17:30:34 Time when the event occurred. UTC/GMT
Updated 2025-05-15 17:41:43 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 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 26 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 2.398 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.3 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 201 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 us7000pzdr Id of event.
Event Code 7000pzdr An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us7000pzdr, A comma-separated list of event ids that are associated to an event.

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