M4.6 Earthquake 99 km WSW of Buala, Solomon Islands — December 17, 2023
2023-12-17 21:28:14 UTC (2023-12-17) · approx. 8:28 AM UTC+11 local
Aftershock of the M5.1 mainshock.
On December 17, 2023 at 21:28 UTC, a magnitude 4.6 intermediate depth earthquake struck 99 km WSW of Buala, Solomon Islands, at a depth of 118.3 km and coordinates -8.3658°, 158.7158°. This earthquake was detected by 50 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 326, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.6 releases seismic energy equivalent to roughly 120 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 899 m — a useful intuition for the size of the slip patch on the fault.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.1 mainshock that occurred 13 days ago 110 km W of Buala, Solomon Islands. Since the mainshock, the USGS has recorded 0 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
158.7158°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.6 earthquake near Buala, Solomon Islands?
The magnitude 4.6 earthquake that struck 99 km WSW of Buala, Solomon Islands on December 17, 2023 at 21:28 UTC had a depth of 118.3 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -8.3658°, 158.7158°, which is 99 km WSW of Buala, Solomon Islands.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.6 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.1 one earlier?
No. This magnitude 4.6 earthquake is an aftershock of the larger magnitude 5.1 mainshock that occurred earlier 110 km W of Buala, Solomon Islands. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
Authoritative source: USGS event page (event ID: us7000ljr5). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, December 17, 2023). M4.6 Earthquake 99 km WSW of Buala, Solomon Islands — December 17, 2023. Retrieved February 27, 2024 from https://www.earthquaketracker.org/earthquakes/event/us7000ljr5/