M7.1 Earthquake 180 km NNE of Gili Air, Indonesia — August 28, 2023
2023-08-28 19:55:30 UTC (2023-08-28) · approx. 3:55 AM UTC+8 local
Felt by 629 people across surrounding communities.
On August 28, 2023 at 19:55 UTC, a magnitude 7.1 deep-focus earthquake struck 180 km NNE of Gili Air, Indonesia, at a depth of 500.0 km and coordinates -6.7888°, 116.5211°. The earthquake was reported felt by 629 peopleacross surrounding communities, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 3.8 (light). The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. This earthquake was detected by 139 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 1077, making it one of the most significant global earthquakes in recent days. The nearest populated place is Banjar Mambalkajanan (population 0).
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 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 629 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 | 3,324,902 |
| MMI 4 | light | 857,621 |
Earthquake Details
116.5211°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 7.1 earthquake near Gili Air, Indonesia?
The magnitude 7.1 earthquake that struck 180 km NNE of Gili Air, Indonesia on August 28, 2023 at 19:55 UTC had a depth of 500.0 km. It was felt by 629 people with maximum shaking intensity of MMI 3.8 (light). For context, this was a strong earthquake capable of causing significant damage.
Where did the earthquake occur?
The earthquake epicenter was located at -6.7888°, 116.5211°, which is 180 km NNE of Gili Air, Indonesia. The nearest populated place is Banjar Mambalkajanan (population 0). View all earthquakes in Indonesia.
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 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 7.1 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us7000krjx). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, August 28, 2023). M7.1 Earthquake 180 km NNE of Gili Air, Indonesia — August 28, 2023. Retrieved January 26, 2024 from https://www.earthquaketracker.org/earthquakes/event/us7000krjx/