M4.2 Earthquake 135 km WSW of Buala, Solomon Islands — July 17, 2023
2023-07-17 18:58:27 UTC (2023-07-17) · approx. 5:58 AM UTC+11 local
On July 17, 2023 at 18:58 UTC, a magnitude 4.2 intermediate depth earthquake struck 135 km WSW of Buala, Solomon Islands, at a depth of 162.1 km and coordinates -8.4255°, 158.3948°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 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 21 days ago 106 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
158.3948°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.2 earthquake near Buala, Solomon Islands?
The magnitude 4.2 earthquake that struck 135 km WSW of Buala, Solomon Islands on July 17, 2023 at 18:58 UTC had a depth of 162.1 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 4.2 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 4.2 earthquake is an aftershock of the larger magnitude 5.1 mainshock that occurred earlier 106 km W of Buala, Solomon Islands. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000ki8p). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, July 17, 2023). M4.2 Earthquake 135 km WSW of Buala, Solomon Islands — July 17, 2023. Retrieved September 28, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000ki8p/