M4.8 Earthquake south of the Mariana Islands — September 19, 2023
2023-09-19 21:10:54 UTC (2023-09-19) · approx. 7:10 AM UTC+10 local
Felt by 1 person across nearby locations.
On September 19, 2023 at 21:10 UTC, a magnitude 4.8 shallow crustal earthquake struck south of the Mariana Islands, at a depth of 10.0 km and coordinates 10.8218°, 144.0692°. This earthquake was detected by 48 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 355, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.8 releases seismic energy equivalent to roughly 239 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.2 km — a useful intuition for the size of the slip patch on the fault.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 1 citizen response to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
144.0692°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.8 earthquake south of the Mariana Islands?
The magnitude 4.8 earthquake that struck south of the Mariana Islands on September 19, 2023 at 21:10 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 10.8218°, 144.0692°, which is south of the Mariana Islands.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.8 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us7000kwrt). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, September 19, 2023). M4.8 Earthquake south of the Mariana Islands — September 19, 2023. Retrieved December 2, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kwrt/