M7.1 Earthquake 60 km ENE of Pondaguitan, Philippines — August 11, 2021
2021-08-11 17:46:13 UTC (2021-08-11) · approx. 1:46 AM UTC+8 local
Felt by 153 people across surrounding communities. Maximum shaking intensity MMI 6.8 (very strong).
On August 11, 2021 at 17:46 UTC, a magnitude 7.1 shallow crustal earthquake struck 60 km ENE of Pondaguitan, Philippines, at a depth of 55.1 km and coordinates 6.4748°, 126.7151°. The earthquake was reported felt by 153 peopleacross surrounding communities, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 6.8 (very strong). The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. The nearest populated place is Bobon (population 4,515).
Physical scale: An earthquake of magnitude 7.1 releases seismic energy equivalent to roughly 674 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 48 km — a useful intuition for the size of the slip patch on the fault.
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
Nearest Populated Places
What the Shaking Felt Like
At MMI 6.8 (very strong), people in the most strongly affected areas would have experienced: Strong shaking felt by everyone. Heavy furniture may move. Books fall from shelves. Plaster and chimneys may crack. Damage is generally slight in well-built structures.
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
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 153 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
Population exposure (USGS PAGER)
Estimated population that experienced each level of shaking. Based on the USGS PAGER rapid impact assessment, which combines ShakeMap output with global population grids.
| Shaking intensity (MMI) | Description | Population exposed |
|---|---|---|
| MMI 3 | weak | 16,903,912 |
| MMI 4 | light | 13,167,114 |
| MMI 5 | moderate | 7,034,505 |
| MMI 6 | strong | 805,640 |
| MMI 7 | very strong | 137,321 |
Earthquake Details
126.7151°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 7.1 earthquake near Pondaguitan, Philippines?
The magnitude 7.1 earthquake that struck 60 km ENE of Pondaguitan, Philippines on August 11, 2021 at 17:46 UTC had a depth of 55.1 km. It was felt by 153 people with maximum shaking intensity of MMI 6.8 (very strong). For context, this was a strong earthquake capable of causing significant damage.
Where did the earthquake occur?
The earthquake epicenter was located at 6.4748°, 126.7151°, which is 60 km ENE of Pondaguitan, Philippines. The nearest populated place is Bobon (population 4,515). View all earthquakes in Philippines.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 7.1 earthquakes can continue for months to years and gradually diminish over time.
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 7.1 event is within one magnitude unit of that historical record.
Authoritative source: USGS event page (event ID: us6000f48v). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 11, 2021). M7.1 Earthquake 60 km ENE of Pondaguitan, Philippines — August 11, 2021. Retrieved December 22, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000f48v/