M4.4 Earthquake 111 km S of Koshima, Japan — October 19, 2023
2023-10-19 20:03:37 UTC (2023-10-19) · approx. 5:03 AM UTC+9 local
On October 19, 2023 at 20:03 UTC, a magnitude 4.4 shallow crustal earthquake struck 111 km S of Koshima, Japan, at a depth of 39.6 km and coordinates 29.2329°, 130.5372°.
Physical scale: An earthquake of magnitude 4.4 releases seismic energy equivalent to roughly 60 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 655 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
130.5372°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.4 earthquake near Koshima, Japan?
The magnitude 4.4 earthquake that struck 111 km S of Koshima, Japan on October 19, 2023 at 20:03 UTC had a depth of 39.6 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.4 earthquakes can continue for several days and gradually diminish over time.
Actions
Location
Understanding This Data
Magnitude 4.4 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000l60d). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, October 19, 2023). M4.4 Earthquake 111 km S of Koshima, Japan — October 19, 2023. Retrieved December 26, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000l60d/