M4.0 Earthquake 33 km NE of Chabahar, Iran — December 18, 2021
2021-12-18 19:40:33 UTC (2021-12-18) · approx. 11:40 PM UTC+4 local
On December 18, 2021 at 19:40 UTC, a magnitude 4.0 shallow crustal earthquake struck 33 km NE of Chabahar, Iran, at a depth of 10.0 km and coordinates 25.5047°, 60.8744°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
60.8744°E
Technical Information
Common Questions
How strong was the magnitude 4.0 earthquake near Chabahar, Iran?
The magnitude 4.0 earthquake that struck 33 km NE of Chabahar, Iran on December 18, 2021 at 19:40 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 4.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000gekf). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 18, 2021). M4.0 Earthquake 33 km NE of Chabahar, Iran — December 18, 2021. Retrieved March 1, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000gekf/