Light earthquake, 4.1 mag was detected near Ogano in Japan

Posted by admin on September 19, 2025 0 Comments

A light earthquake magnitude 4.1 (ml/mb) strikes 3 kilometers (2 miles) from Ogano in Japan on Saturday. Event id: us7000qwxi. Ids that are associated to the earthquake: us7000qwxi. Global time and date of event 23/08/25 / 2025-08-23 10:22:11 / August 23, 2025 @ 10:22 am UTC/GMT. Exact location of event, longitude 138.9697 East, latitude 36.0353 North, depth = 129.454 km. The 4.1-magnitude earthquake has occurred at 10:22:11 / 10:22 am (local time epicenter). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The earthquake occurred at a depth of 129.454 km (80 miles).

Nearest cities/city/towns to hypocenter/epicentrum was Mitsukaidō, Shiojiri, Ishige (min 5000 pop). Close country/countries, Japan (c. 127 288 000 pop) (That might be effected). Earthquake epicenter was 76 km (47 miles) from Tokyo (c. 8 336 600 pop), 89 km (55 miles) from Yokohama (c. 3 574 400 pop), 88 km (55 miles) from Kawasaki (c. 1 306 800 pop), 63 km (39 miles) from Saitama (c. 1 193 400 pop), 62 km (39 miles) from Yono (c. 1 077 700 pop), 53 km (33 miles) from Hachiōji (c. 579 400 pop).

In the past 24 hours, there have been three, in the last 10 days three, in the past 30 days five and in the last 365 days thirty-five earthquakes of magnitude 3.0 or greater that has struck near. 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.

Did you feel the quake?

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: 3 km WNW of Ogano, Japan.

More information

Parameter	Value	Description
Magnitude	4.1 mb	The magnitude for the event.
Longitude	138.9697° East	Decimal degrees longitude. Negative values for western longitudes.
Latitude	36.0353° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	129.454 km	Depth of the event in kilometers.
Place	3 km WNW of Ogano, Japan	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-08-23 10:22:11	Time when the event occurred. UTC/GMT
Updated	2025-09-19 10:11:38	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	259	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	41	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.796	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	1.11 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	136	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	us7000qwxi	Id of event.
Event Code	7000qwxi	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us7000qwxi,	A comma-separated list of event ids that are associated to an event.

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Light earthquake, 4.1 mag was detected near Ogano in Japan

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