M4.0 Earthquake 166 km S of ?yama, Japan — August 19, 2020
2020-08-19 22:37:44 UTC (2020-08-19) · approx. 7:37 AM UTC+9 local
On August 19, 2020 at 22:37 UTC, a magnitude 4.0 deep-focus earthquake struck 166 km S of ?yama, Japan, at a depth of 324.6 km and coordinates 33.1200°, 137.9320°.0
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.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from submitted 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
137.9320°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near ?yama, Japan?
The magnitude 4.0 earthquake that struck 166 km S of ?yama, Japan on August 19, 2020 at 22:37 UTC had a depth of 324.6 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: us6000bhgg). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, August 19, 2020). M4.0 Earthquake 166 km S of ?yama, Japan — August 19, 2020. Retrieved October 31, 2020 from https://www.earthquaketracker.org/earthquakes/event/us6000bhgg/