M4.9 Earthquake in the Mariana Islands region — July 8, 2022
2022-07-08 23:42:44 UTC (2022-07-08) · approx. 9:42 AM UTC+10 local
On July 8, 2022 at 23:42 UTC, a magnitude 4.9 shallow crustal earthquake struck in the Mariana Islands region, at a depth of 27.6 km and coordinates 18.6712°, 147.0012°. The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. This earthquake was detected by 80 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 369, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.9 releases seismic energy equivalent to roughly 338 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.4 km — 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
147.0012°E
Technical Information
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Common Questions
How strong was the magnitude 4.9 earthquake in the Mariana Islands region?
The magnitude 4.9 earthquake that struck in the Mariana Islands region on July 8, 2022 at 23:42 UTC had a depth of 27.6 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 18.6712°, 147.0012°, which is in the Mariana Islands region.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.9 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us6000i2py). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, July 8, 2022). M4.9 Earthquake in the Mariana Islands region — July 8, 2022. Retrieved September 13, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000i2py/