M4.7 Earthquake in the Mariana Islands region — July 20, 2023
2023-07-20 02:44:24 UTC (2023-07-20) · approx. 12:44 PM UTC+10 local
On July 20, 2023 at 02:44 UTC, a magnitude 4.7 shallow crustal earthquake struck in the Mariana Islands region, at a depth of 10.0 km and coordinates 18.8371°, 147.0789°. This earthquake was detected by 88 seismic stations with good 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.
Earthquake Details
147.0789°E
Technical Information
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Common Questions
How strong was the magnitude 4.7 earthquake in the Mariana Islands region?
The magnitude 4.7 earthquake that struck in the Mariana Islands region on July 20, 2023 at 02:44 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 18.8371°, 147.0789°, which is in the Mariana Islands region.
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.
Actions
Authoritative source: USGS event page (event ID: us7000kh0n). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, July 20, 2023). M4.7 Earthquake in the Mariana Islands region — July 20, 2023. Retrieved September 28, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kh0n/