4.9

M4.9 Earthquake 63 km WSW of Merizo Village, Guam — September 16, 2024

2024-09-16 18:11:59 UTC (2024-09-16) · approx. 4:11 AM UTC+10 local

Felt by 13 people across nearby locations. Aftershock of the M5.0 mainshock.

MagnitudeM4.9(mb)
Time18:11 UTC≈ 4:11 AM UTC+10
Depth10.0 kmshallow crustal
Coordinates12.950°, 144.175°
Felt by13DYFI responses
Status✓ Reviewed by USGS

On September 16, 2024 at 18:11 UTC, a magnitude 4.9 shallow crustal earthquake struck 63 km WSW of Merizo Village, Guam, at a depth of 10.0 km and coordinates 12.9499°, 144.1752°. This earthquake was detected by 51 seismic stations with good location accuracy and was assigned a USGS significance rating of 375, 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.

This earthquake is part of an ongoing aftershock sequence following the magnitude 5.0 mainshock that occurred 18 days ago 58 km SSW of Merizo Village, Guam. 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.

Map showing earthquake epicenter at 12.95°, 144.18°

Did You Feel It? — community-reported shaking

Aggregated felt-report intensity from 13 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.

USGS DYFI community-reported intensity map for the M4.9 earthquake near 63 km WSW of Merizo Village, Guam

Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report

Earthquake Details

Magnitude
4.9 mb
Depth
10.0 km
shallow crustal
Location
12.9499°N
144.1752°E
Felt Reports
13
DYFI responses
Community Intensity
4.1
CDI from reports

Technical Information

Event ID
us7000nean
Event Type
earthquake
Status
✓ Reviewed
Significance
375
Stations Used
51
Azimuthal Gap
92.0°
Min Station Distance
2.759°
RMS Residual
0.59 sec
Last Updated
2024-11-23 23:27:19 UTC

Nearby Earthquakes (Last 7 Days)

4.3
159 km ESE of Saipan, Northern Mariana Islands
6 days ago · 10.0 km deep

Common Questions

How strong was the magnitude 4.9 earthquake near Merizo Village, Guam?

The magnitude 4.9 earthquake that struck 63 km WSW of Merizo Village, Guam on September 16, 2024 at 18:11 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.

Where did the earthquake occur?

The earthquake epicenter was located at 12.9499°, 144.1752°, which is 63 km WSW of Merizo Village, Guam.

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.

Is this the same earthquake as the M5.0 one earlier?

No. This magnitude 4.9 earthquake is an aftershock of the larger magnitude 5.0 mainshock that occurred earlier 58 km SSW of Merizo Village, Guam. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.

Actions

View on USGSDid You Feel It?

Authoritative source: USGS event page (event ID: us7000nean). All scientific values on this page are sourced verbatim from the USGS feed.

Cite this page: EarthquakeTracker.org. (2024, September 16, 2024). M4.9 Earthquake 63 km WSW of Merizo Village, Guam — September 16, 2024. Retrieved November 23, 2024 from https://www.earthquaketracker.org/earthquakes/event/us7000nean/