M4.6 Earthquake 33 km SSE of Cilacap, Indonesia — May 28, 2026
2026-05-28 20:59:12 UTC (2026-05-28) · approx. 3:59 AM UTC+7 local
On May 28, 2026 at 20:59 UTC, a magnitude 4.6 intermediate depth earthquake struck 33 km SSE of Cilacap, Indonesia, at a depth of 83.4 km and coordinates -8.0169°, 109.1010°. This earthquake was detected by 75 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 326, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.6 releases seismic energy equivalent to roughly 120 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 899 m — 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
Earthquake Details
109.1010°E
Technical Information
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Common Questions
How strong was the magnitude 4.6 earthquake near Cilacap, Indonesia?
The magnitude 4.6 earthquake that struck 33 km SSE of Cilacap, Indonesia on May 28, 2026 at 20:59 UTC had a depth of 83.4 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -8.0169°, 109.1010°, which is 33 km SSE of Cilacap, Indonesia. View all earthquakes in Indonesia.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.6 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 4.6 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us7000sp6e). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, May 28, 2026). M4.6 Earthquake 33 km SSE of Cilacap, Indonesia — May 28, 2026. Retrieved June 16, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000sp6e/