M3.1 Earthquake 6 km WSW of Guánica, Puerto Rico — August 9, 2020
2020-08-09 22:31:09 UTC (2020-08-09) · approx. 6:31 PM UTC-4 local
On August 9, 2020 at 22:31 UTC, a magnitude 3.1 shallow crustal earthquake struck 6 km WSW of Guánica, Puerto Rico, at a depth of 11.0 km and coordinates 17.9503°, -66.9680°.
Physical scale: An earthquake of magnitude 3.1 releases seismic energy equivalent to roughly 747 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 87 m — a useful intuition for the size of the slip patch on the fault.
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Earthquake Details
-66.9680°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.1 earthquake near Guánica, Puerto Rico?
The magnitude 3.1 earthquake that struck 6 km WSW of Guánica, Puerto Rico on August 9, 2020 at 22:31 UTC had a depth of 11.0 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.1 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 3.1 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2020222005). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, August 9, 2020). M3.1 Earthquake 6 km WSW of Guánica, Puerto Rico — August 9, 2020. Retrieved October 21, 2020 from https://www.earthquaketracker.org/earthquakes/event/pr2020222005/