M4.9 Earthquake 92 km SSW of Trenggalek, Indonesia — July 27, 2021
2021-07-27 16:21:48 UTC (2021-07-27) · approx. 11:21 PM UTC+7 local
Felt by 2 people across nearby locations.
On July 27, 2021 at 16:21 UTC, a magnitude 4.9 shallow crustal earthquake struck 92 km SSW of Trenggalek, Indonesia, at a depth of 49.6 km and coordinates -8.8588°, 111.4054°.
Physical scale: An earthquake of magnitude 4.9 releases seismic energy equivalent to roughly 338 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.4 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
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
Earthquake Details
111.4054°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.9 earthquake near Trenggalek, Indonesia?
The magnitude 4.9 earthquake that struck 92 km SSW of Trenggalek, Indonesia on July 27, 2021 at 16:21 UTC had a depth of 49.6 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -8.8588°, 111.4054°, which is 92 km SSW of Trenggalek, Indonesia. View all earthquakes in Indonesia.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.9 earthquakes can continue for several days 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 4.9 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us6000ezjt). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, July 27, 2021). M4.9 Earthquake 92 km SSW of Trenggalek, Indonesia — July 27, 2021. Retrieved October 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000ezjt/