M4.0 Earthquake 71 km NE of Hengchun, Taiwan — September 28, 2020
2020-09-28 19:05:08 UTC (2020-09-28) · approx. 3:05 AM UTC+8 local
On September 28, 2020 at 19:05 UTC, a magnitude 4.0 shallow crustal earthquake struck 71 km NE of Hengchun, Taiwan, at a depth of 19.1 km and coordinates 22.4542°, 121.2435°.
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
121.2435°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near Hengchun, Taiwan?
The magnitude 4.0 earthquake that struck 71 km NE of Hengchun, Taiwan on September 28, 2020 at 19:05 UTC had a depth of 19.1 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: us6000c4qx). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, September 28, 2020). M4.0 Earthquake 71 km NE of Hengchun, Taiwan — September 28, 2020. Retrieved December 5, 2020 from https://www.earthquaketracker.org/earthquakes/event/us6000c4qx/