M4.8 Earthquake 76 km NNE of Mamuju, Indonesia — September 13, 2020
2020-09-13 16:59:58 UTC (2020-09-13) · approx. 12:59 AM UTC+8 local
On September 13, 2020 at 16:59 UTC, a magnitude 4.8 shallow crustal earthquake struck 76 km NNE of Mamuju, Indonesia, at a depth of 25.6 km and coordinates -2.0784°, 119.2332°.
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.
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
119.2332°E
Technical Information
Common Questions
How strong was the magnitude 4.8 earthquake near Mamuju, Indonesia?
The magnitude 4.8 earthquake that struck 76 km NNE of Mamuju, Indonesia on September 13, 2020 at 16:59 UTC had a depth of 25.6 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -2.0784°, 119.2332°, which is 76 km NNE of Mamuju, Indonesia. View all earthquakes in Indonesia.
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.
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 4.8 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us7000bmqx). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, September 13, 2020). M4.8 Earthquake 76 km NNE of Mamuju, Indonesia — September 13, 2020. Retrieved November 21, 2020 from https://www.earthquaketracker.org/earthquakes/event/us7000bmqx/