M5.1 Earthquake 15 km S of Sarangani, Philippines — October 29, 2021
2021-10-29 04:33:31 UTC (2021-10-29) · approx. 12:33 PM UTC+8 local
Felt by 3 people across nearby locations. Aftershock of the M5.2 mainshock.
On October 29, 2021 at 04:33 UTC, a magnitude 5.1 intermediate depth earthquake struck 15 km S of Sarangani, Philippines, at a depth of 177.3 km and coordinates 5.2665°, 125.4891°.
Physical scale: An earthquake of magnitude 5.1 releases seismic energy equivalent to roughly 674 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 2.0 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 5.2 mainshock that occurred 17 days ago 44 km SE of Sarangani, Philippines. 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.
The epicenter is located in Philippines, a region characterized by the Manila Trench and Philippine Trench subduction systems, where the Philippine Sea Plate overrides the Eurasian Plate. The nearest mapped fault system is the Philippine Fault. View all earthquakes in Philippines.
Learn more: Magnitude scale · Aftershock sequences
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.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
125.4891°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 5.1 earthquake near Sarangani, Philippines?
The magnitude 5.1 earthquake that struck 15 km S of Sarangani, Philippines on October 29, 2021 at 04:33 UTC had a depth of 177.3 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at 5.2665°, 125.4891°, which is 15 km S of Sarangani, Philippines. View all earthquakes in Philippines.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.1 earthquakes can continue for days to weeks and gradually diminish over time.
Is this the same earthquake as the M5.2 one earlier?
No. This magnitude 5.1 earthquake is an aftershock of the larger magnitude 5.2 mainshock that occurred earlier 44 km SE of Sarangani, Philippines. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
Has Philippines had earthquakes this big before?
The largest recorded earthquake in Philippines was the M8.0 Mindanao earthquake of August 17, 1976. Today's magnitude 5.1 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us7000fpmk). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, October 29, 2021). M5.1 Earthquake 15 km S of Sarangani, Philippines — October 29, 2021. Retrieved January 14, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000fpmk/