M4.3 Earthquake 65 km E of Yilan, Taiwan — August 4, 2021
2021-08-04 23:28:13 UTC (2021-08-04) · approx. 7:28 AM UTC+8 local
On August 4, 2021 at 23:28 UTC, a magnitude 4.3 shallow crustal earthquake struck 65 km E of Yilan, Taiwan, at a depth of 15.5 km and coordinates 24.7973°, 122.3945°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
122.3945°E
Technical Information
Common Questions
How strong was the magnitude 4.3 earthquake near Yilan, Taiwan?
The magnitude 4.3 earthquake that struck 65 km E of Yilan, Taiwan on August 4, 2021 at 23:28 UTC had a depth of 15.5 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 4.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000f4ji). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 4, 2021). M4.3 Earthquake 65 km E of Yilan, Taiwan — August 4, 2021. Retrieved October 14, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000f4ji/