M4.7 Earthquake 238 km NNE of Tobelo, Indonesia — September 12, 2021
2021-09-12 13:34:34 UTC (2021-09-12) · approx. 10:34 PM UTC+9 local
On September 12, 2021 at 13:34 UTC, a magnitude 4.7 shallow crustal earthquake struck 238 km NNE of Tobelo, Indonesia, at a depth of 10.0 km and coordinates 3.7563°, 128.7363°.
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
128.7363°E
Technical Information
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Common Questions
How strong was the magnitude 4.7 earthquake near Tobelo, Indonesia?
The magnitude 4.7 earthquake that struck 238 km NNE of Tobelo, Indonesia on September 12, 2021 at 13:34 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 3.7563°, 128.7363°, which is 238 km NNE of Tobelo, 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: us7000fajk). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 12, 2021). M4.7 Earthquake 238 km NNE of Tobelo, Indonesia — September 12, 2021. Retrieved November 23, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000fajk/