Light earthquake, 4.5 mag strikes near Ryūgasaki in Japan

Posted by admin on May 27, 2025 0 Comments

A light earthquake with magnitude 4.5 (ml/mb) was detected on Monday, 1 kilometers (1 miles) from Ryūgasaki in Japan. Exact time and date of earthquake 12/05/25 / 2025-05-12 23:33:35 / May 12, 2025 @ 11:33 pm UTC/GMT. The 4.5-magnitude earthquake was detected at 23:33:35 / 11:33 pm (local time epicenter). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Exact location, longitude 140.1659° East, latitude 35.8935° North, depth = 77.893 km. The epicenter of the earthquake was roughly 77.893 km (48 miles) below the earth’s surface. Unique identifier: us6000qg8d. Ids that are associated to the event: us6000qg8d.

Earthquake epicenter was 48 km (30 miles) from Tokyo (c. 8 336 600 pop), 68 km (43 miles) from Yokohama (c. 3 574 400 pop), 58 km (36 miles) from Kawasaki (c. 1 306 800 pop), 46 km (29 miles) from Saitama (c. 1 193 400 pop), 48 km (30 miles) from Yono (c. 1 077 700 pop), 32 km (20 miles) from Chiba (c. 919 700 pop), 80 km (50 miles) from Hachiōji (c. 579 400 pop). Nearest cities/city/villages to epicentrum/hypocenter was Isehara, Honjō, Chigasaki (min 5000 pop). Country/countries that might be effected, Japan (c. 127 288 000 pop).

There are an estimated 13,000 light quakes in the world each year. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. 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 seventy-five earthquakes of magnitude 3.0 or greater that has struck near.

Did you feel it?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity 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: 1 km WSW of Ryūgasaki, Japan.

More information

Parameter	Value	Description
Magnitude	4.5 mb	The magnitude for the event.
Longitude	140.1659° East	Decimal degrees longitude. Negative values for western longitudes.
Latitude	35.8935° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	77.893 km	Depth of the event in kilometers.
Place	1 km WSW of Ryūgasaki, Japan	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-05-12 23:33:35	Time when the event occurred. UTC/GMT
Updated	2025-05-27 23:46:45	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	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	34	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	1.71	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.51 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	145	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	us6000qg8d	Id of event.
Event Code	6000qg8d	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us6000qg8d,	A comma-separated list of event ids that are associated to an event.

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Light earthquake, 4.5 mag strikes near Ryūgasaki in Japan

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