M4.9 Earthquake 41 km SW of Mashhad, Iran — April 27, 2023
2023-04-27 22:39:01 UTC (2023-04-27) · approx. 2:39 AM UTC+4 local
Felt by 74 people across nearby locations.
On April 27, 2023 at 22:39 UTC, a magnitude 4.9 shallow crustal earthquake struck 41 km SW of Mashhad, Iran, at a depth of 10.0 km and coordinates 35.9918°, 59.3364°. This earthquake was detected by 115 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 400, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.9 releases seismic energy equivalent to roughly 338 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.4 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Iran, a region characterized by the Zagros fold-and-thrust belt, where the Arabian Plate collides with Eurasia at 20-25 mm per year. The nearest mapped fault system is the Zagros Fault. View all earthquakes in Iran.
Learn more: Magnitude scale · Aftershock sequences
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 74 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
59.3364°E
Technical Information
Common Questions
How strong was the magnitude 4.9 earthquake near Mashhad, Iran?
The magnitude 4.9 earthquake that struck 41 km SW of Mashhad, Iran on April 27, 2023 at 22:39 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 35.9918°, 59.3364°, which is 41 km SW of Mashhad, Iran. View all earthquakes in Iran.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.9 earthquakes can continue for several days and gradually diminish over time.
Has Iran had earthquakes this big before?
The largest recorded earthquake in Iran was the M7.8 Tabas earthquake of September 16, 1978. Today's magnitude 4.9 event is significantly smaller than that historical record.
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Location
Authoritative source: USGS event page (event ID: us7000jwf5). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, April 27, 2023). M4.9 Earthquake 41 km SW of Mashhad, Iran — April 27, 2023. Retrieved October 15, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000jwf5/