M4.3 Earthquake in the Santa Cruz Islands region — April 1, 2023
2023-04-01 17:57:50 UTC (2023-04-01) · approx. 4:57 AM UTC+11 local
On April 1, 2023 at 17:57 UTC, a magnitude 4.3 deep-focus earthquake struck in the Santa Cruz Islands region, at a depth of 643.1 km and coordinates -12.8968°, 169.2742°.
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
169.2742°E
Technical Information
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Common Questions
How strong was the magnitude 4.3 earthquake in the Santa Cruz Islands region?
The magnitude 4.3 earthquake that struck in the Santa Cruz Islands region on April 1, 2023 at 17:57 UTC had a depth of 643.1 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 4.3 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: us6000k2dc). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, April 1, 2023). M4.3 Earthquake in the Santa Cruz Islands region — April 1, 2023. Retrieved June 3, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000k2dc/