M5.7 Earthquake 106 km NE of Poso, Indonesia — August 26, 2021
2021-08-26 02:14:22 UTC (2021-08-26) · approx. 10:14 AM UTC+8 local
Felt by 2 people across nearby locations. Maximum shaking intensity MMI 7.2 (severe).
On August 26, 2021 at 02:14 UTC, a magnitude 5.7 shallow crustal earthquake struck 106 km NE of Poso, Indonesia, at a depth of 8.0 km and coordinates -0.8389°, 121.5296°. The earthquake was reported felt by 2 peopleacross nearby locations, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 7.2 (severe). The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. The nearest populated place is Ampana (population 0).
Physical scale: An earthquake of magnitude 5.7 releases seismic energy equivalent to roughly 5 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 5.2 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Indonesia, a region characterized by the convergence of the Indo-Australian, Eurasian, and Philippine Sea plates, forming the Sunda-Banda arc system. The nearest mapped fault system is the Sunda megathrust. View all earthquakes in Indonesia.
Learn more: Magnitude scale · Aftershock sequences
Nearest Populated Places
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 2 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 | 3,711,213 |
| MMI 4 | light | 429,237 |
| MMI 5 | moderate | 7,822 |
| MMI 6 | strong | 4,130 |
| MMI 7 | very strong | 12,399 |
Earthquake Details
121.5296°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 5.7 earthquake near Poso, Indonesia?
The magnitude 5.7 earthquake that struck 106 km NE of Poso, Indonesia on August 26, 2021 at 02:14 UTC had a depth of 8.0 km. It was felt by 2 people with maximum shaking intensity of MMI 7.2 (severe). For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at -0.8389°, 121.5296°, which is 106 km NE of Poso, Indonesia. The nearest populated place is Ampana (population 0). View all earthquakes in Indonesia.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.7 earthquakes can continue for days to weeks and gradually diminish over time.
Has Indonesia had earthquakes this big before?
The largest recorded earthquake in Indonesia was the M9.1 Indian Ocean earthquake of December 26, 2004. Today's magnitude 5.7 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us7000f3zp). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 26, 2021). M5.7 Earthquake 106 km NE of Poso, Indonesia — August 26, 2021. Retrieved December 22, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000f3zp/