M5.1 Earthquake 52 km E of Yilan, Taiwan — August 4, 2021
2021-08-04 21:56:27 UTC (2021-08-04) · approx. 5:56 AM UTC+8 local
Felt by 1 person across nearby locations.
On August 4, 2021 at 21:56 UTC, a magnitude 5.1 shallow crustal earthquake struck 52 km E of Yilan, Taiwan, at a depth of 10.0 km and coordinates 24.7534°, 122.2717°.
Physical scale: An earthquake of magnitude 5.1 releases seismic energy equivalent to roughly 674 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 2.0 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Taiwan, a region characterized by the collision of the Luzon volcanic arc with the Eurasian continental margin, where the Philippine Sea Plate converges at 80 mm per year. View all earthquakes in Taiwan.
Learn more: Magnitude scale · Aftershock sequences
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 1 citizen response 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
122.2717°E
Technical Information
Common Questions
How strong was the magnitude 5.1 earthquake near Yilan, Taiwan?
The magnitude 5.1 earthquake that struck 52 km E of Yilan, Taiwan on August 4, 2021 at 21:56 UTC had a depth of 10.0 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at 24.7534°, 122.2717°, which is 52 km E of Yilan, Taiwan. View all earthquakes in Taiwan.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.1 earthquakes can continue for days to weeks and gradually diminish over time.
Has Taiwan had earthquakes this big before?
The largest recorded earthquake in Taiwan was the M7.6 Chi-Chi earthquake of September 21, 1999. Today's magnitude 5.1 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us6000f29z). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 4, 2021). M5.1 Earthquake 52 km E of Yilan, Taiwan — August 4, 2021. Retrieved October 14, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000f29z/