4.4

M4.4 Earthquake 37 km SE of Bobon, Philippines — August 21, 2020

2020-08-21 21:50:07 UTC (2020-08-21) · approx. 5:50 AM UTC+8 local

MagnitudeM4.4(mb)
Time21:50 UTC≈ 5:50 AM UTC+8
Depth59.4 kmshallow crustal
Coordinates6.624°, 126.564°
Felt byNo felt reports
Status✓ Reviewed by USGS

On August 21, 2020 at 21:50 UTC, a magnitude 4.4 shallow crustal earthquake struck 37 km SE of Bobon, Philippines, at a depth of 59.4 km and coordinates 6.6243°, 126.5635°.

Physical scale: An earthquake of magnitude 4.4 releases seismic energy equivalent to roughly 60 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 655 m — a useful intuition for the size of the slip patch on the fault.

Map showing earthquake epicenter at 6.62°, 126.56°

Earthquake Details

Magnitude
4.4 mb
Depth
59.4 km
shallow crustal
Location
6.6243°N
126.5635°E

Technical Information

Event ID
us7000bds1
Event Type
earthquake
Status
✓ Reviewed
Significance
298
Azimuthal Gap
81.0°
Min Station Distance
1.072°
RMS Residual
0.41 sec
Last Updated
2020-10-31 19:06:33 UTC

Common Questions

How strong was the magnitude 4.4 earthquake near Bobon, Philippines?

The magnitude 4.4 earthquake that struck 37 km SE of Bobon, Philippines on August 21, 2020 at 21:50 UTC had a depth of 59.4 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 4.4 earthquakes can continue for several days and gradually diminish over time.

Understanding This Data

Magnitude 4.4 earthquakes are often felt but rarely cause damage.

Learn more about magnitude →

Authoritative source: USGS event page (event ID: us7000bds1). All scientific values on this page are sourced verbatim from the USGS feed.

Cite this page: EarthquakeTracker.org. (2020, August 21, 2020). M4.4 Earthquake 37 km SE of Bobon, Philippines — August 21, 2020. Retrieved October 31, 2020 from https://www.earthquaketracker.org/earthquakes/event/us7000bds1/