M4.1 Earthquake 55 km NNW of Poso, Indonesia — July 30, 2023
2023-07-30 23:39:21 UTC (2023-07-30) · approx. 7:39 AM UTC+8 local
On July 30, 2023 at 23:39 UTC, a magnitude 4.1 shallow crustal earthquake struck 55 km NNW of Poso, Indonesia, at a depth of 10.0 km and coordinates -0.9468°, 120.5307°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
120.5307°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.1 earthquake near Poso, Indonesia?
The magnitude 4.1 earthquake that struck 55 km NNW of Poso, Indonesia on July 30, 2023 at 23:39 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000kymy). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, July 30, 2023). M4.1 Earthquake 55 km NNW of Poso, Indonesia — July 30, 2023. Retrieved October 7, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000kymy/