M4.7 Earthquake 68 km NNW of Masohi, Indonesia — September 27, 2023
2023-09-27 22:32:59 UTC (2023-09-27) · approx. 7:32 AM UTC+9 local
On September 27, 2023 at 22:32 UTC, a magnitude 4.7 shallow crustal earthquake struck 68 km NNW of Masohi, Indonesia, at a depth of 23.6 km and coordinates -2.7226°, 128.7449°. This earthquake was detected by 61 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 Indonesia, a region characterized by the convergence of the Indo-Australian, Eurasian, and Philippine Sea plates, forming the Sunda-Banda arc system. The nearest mapped fault system is the Sunda megathrust. View all earthquakes in Indonesia.
Learn more: Magnitude scale · Aftershock sequences
Earthquake Details
128.7449°E
Technical Information
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Common Questions
How strong was the magnitude 4.7 earthquake near Masohi, Indonesia?
The magnitude 4.7 earthquake that struck 68 km NNW of Masohi, Indonesia on September 27, 2023 at 22:32 UTC had a depth of 23.6 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -2.7226°, 128.7449°, which is 68 km NNW of Masohi, Indonesia. View all earthquakes in Indonesia.
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 Indonesia had earthquakes this big before?
The largest recorded earthquake in Indonesia was the M9.1 Indian Ocean earthquake of December 26, 2004. Today's magnitude 4.7 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us6000lb8b). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, September 27, 2023). M4.7 Earthquake 68 km NNW of Masohi, Indonesia — September 27, 2023. Retrieved December 9, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000lb8b/