M5.5 Earthquake 115 km NW of Alotau, Papua New Guinea — June 23, 2022
2022-06-23 02:04:30 UTC (2022-06-23) · approx. 12:04 PM UTC+10 local
Maximum shaking intensity MMI 5.7 (strong).
On June 23, 2022 at 02:04 UTC, a magnitude 5.5 shallow crustal earthquake struck 115 km NW of Alotau, Papua New Guinea, at a depth of 10.0 km and coordinates -9.4793°, 149.8333°. The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. This earthquake was detected by 110 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 465, placing it among routine seismic activity. The nearest populated place is Samarai (population 1,638).
Physical scale: An earthquake of magnitude 5.5 releases seismic energy equivalent to roughly 3 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 3.8 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Papua New Guinea, a region characterized by the collision and subduction of the Pacific, Australian, and Solomon Sea plates. View all earthquakes in Papua New Guinea.
Learn more: Magnitude scale · Aftershock sequences
Nearest Populated Places
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
Population exposure (USGS PAGER)
Estimated population that experienced each level of shaking. Based on the USGS PAGER rapid impact assessment, which combines ShakeMap output with global population grids.
| Shaking intensity (MMI) | Description | Population exposed |
|---|---|---|
| MMI 3 | weak | 324,878 |
| MMI 4 | light | 89,992 |
| MMI 5 | moderate | 12,471 |
| MMI 6 | strong | 35 |
Earthquake Details
149.8333°E
Technical Information
Common Questions
How strong was the magnitude 5.5 earthquake near Alotau, Papua New Guinea?
The magnitude 5.5 earthquake that struck 115 km NW of Alotau, Papua New Guinea on June 23, 2022 at 02:04 UTC had a depth of 10.0 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at -9.4793°, 149.8333°, which is 115 km NW of Alotau, Papua New Guinea. The nearest populated place is Samarai (population 1,638). View all earthquakes in Papua New Guinea.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.5 earthquakes can continue for days to weeks and gradually diminish over time.
Has Papua New Guinea had earthquakes this big before?
The largest recorded earthquake in Papua New Guinea was the M8.0 New Britain earthquake of July 18, 1971. Today's magnitude 5.5 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us7000hjgi). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, June 23, 2022). M5.5 Earthquake 115 km NW of Alotau, Papua New Guinea — June 23, 2022. Retrieved August 28, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000hjgi/