4.6

M4.6 Earthquake 78 km ESE of Saipan, Northern Mariana Islands — April 5, 2021

2021-04-05 22:09:01 UTC (2021-04-05) · approx. 8:09 AM UTC+10 local

Felt by 3 people across nearby locations.

MagnitudeM4.6(mb)
Time22:09 UTC≈ 8:09 AM UTC+10
Depth92.0 kmintermediate depth
Coordinates14.997°, 146.449°
Felt by3DYFI responses
Status✓ Reviewed by USGS

On April 5, 2021 at 22:09 UTC, a magnitude 4.6 intermediate depth earthquake struck 78 km ESE of Saipan, Northern Mariana Islands, at a depth of 92.0 km and coordinates 14.9970°, 146.4494°.

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.

Map showing earthquake epicenter at 15.00°, 146.45°

Did You Feel It? — community-reported shaking

Aggregated felt-report intensity from 3 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 M4.6 earthquake near 78 km ESE of Saipan, Northern Mariana Islands

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

Earthquake Details

Magnitude
4.6 mb
Depth
92.0 km
intermediate depth
Location
14.9970°N
146.4494°E
Felt Reports
3
DYFI responses
Community Intensity
3.7
CDI from reports

Technical Information

Event ID
us6000dza4
Event Type
earthquake
Status
✓ Reviewed
Significance
327
Azimuthal Gap
144.0°
Min Station Distance
0.677°
RMS Residual
0.78 sec
Last Updated
2022-08-29 13:17:10 UTC

Common Questions

How strong was the magnitude 4.6 earthquake near Saipan, Northern Mariana Islands?

The magnitude 4.6 earthquake that struck 78 km ESE of Saipan, Northern Mariana Islands on April 5, 2021 at 22:09 UTC had a depth of 92.0 km. For context, this was a light earthquake commonly felt near the epicenter.

Where did the earthquake occur?

The earthquake epicenter was located at 14.9970°, 146.4494°, which is 78 km ESE of Saipan, Northern Mariana 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.

Actions

View on USGSDid You Feel It?

Authoritative source: USGS event page (event ID: us6000dza4). All scientific values on this page are sourced verbatim from the USGS feed.

Cite this page: EarthquakeTracker.org. (2021, April 5, 2021). M4.6 Earthquake 78 km ESE of Saipan, Northern Mariana Islands — April 5, 2021. Retrieved August 29, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000dza4/