4.7

M4.7 Earthquake 113 km N of Hirara, Japan — September 28, 2022

2022-09-28 22:06:39 UTC (2022-09-28) · approx. 6:06 AM UTC+8 local

MagnitudeM4.7(mb)
Time22:06 UTC≈ 6:06 AM UTC+8
Depth116.7 kmintermediate depth
Coordinates25.826°, 125.349°
Felt byNo felt reports
Status✓ Reviewed by USGS

On September 28, 2022 at 22:06 UTC, a magnitude 4.7 intermediate depth earthquake struck 113 km N of Hirara, Japan, at a depth of 116.7 km and coordinates 25.8263°, 125.3485°. This earthquake was detected by 60 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 340, placing it among routine seismic activity.

Physical scale: An earthquake of magnitude 4.7 releases seismic energy equivalent to roughly 169 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.1 km — a useful intuition for the size of the slip patch on the fault.

The epicenter is located in Japan, a region characterized by the intersection of four tectonic plates — Pacific, Philippine Sea, Eurasian, and North American — creating multiple subduction zones. The nearest mapped fault system is the Japan Trench. View all earthquakes in Japan.

Learn more: Magnitude scale · Aftershock sequences

Map showing earthquake epicenter at 25.83°, 125.35°

Earthquake Details

Magnitude
4.7 mb
Depth
116.7 km
intermediate depth
Location
25.8263°N
125.3485°E

Technical Information

Event ID
us6000ip35
Event Type
earthquake
Status
✓ Reviewed
Significance
340
Stations Used
60
Azimuthal Gap
79.0°
Min Station Distance
2.514°
RMS Residual
0.96 sec
Last Updated
2022-12-03 22:02:36 UTC

Common Questions

How strong was the magnitude 4.7 earthquake near Hirara, Japan?

The magnitude 4.7 earthquake that struck 113 km N of Hirara, Japan on September 28, 2022 at 22:06 UTC had a depth of 116.7 km. For context, this was a light earthquake commonly felt near the epicenter.

Where did the earthquake occur?

The earthquake epicenter was located at 25.8263°, 125.3485°, which is 113 km N of Hirara, Japan. View all earthquakes in Japan.

Were there aftershocks?

Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.7 earthquakes can continue for several days and gradually diminish over time.

Has Japan had earthquakes this big before?

The largest recorded earthquake in Japan was the M9.1 Tohoku earthquake of March 11, 2011. Today's magnitude 4.7 event is significantly smaller than that historical record.

Actions

View on USGSDid You Feel It?

Location

Japan
View all Japan earthquakes

Authoritative source: USGS event page (event ID: us6000ip35). All scientific values on this page are sourced verbatim from the USGS feed.

Cite this page: EarthquakeTracker.org. (2022, September 28, 2022). M4.7 Earthquake 113 km N of Hirara, Japan — September 28, 2022. Retrieved December 3, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000ip35/