Reported by BMKG today.
It is one of only 2 we have recorded within 20 km of this point since 4 September 2026.
What the source measured
BMKG reported: Pusat gempa berada di laut 77 km tenggara Cilacap · Felt: III Kebumen, III Bantul, III Cilacap, III Kulonprogo, II-III Pangandaran, II Sleman, II Pacitan, III Purwokerto, II Wonogiri
BMKG recorded magnitude 5.4 at a depth of 10 km.
The seismic region given by the source is Pusat gempa berada di laut 77 km tenggara Cilacap.
An estimated 6,988 people live within 70 km of this point.
How we know
Confirmed by 4 independent sources, including BMKG.
Our own score for this event is 27 out of 100, at 91 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Earthquakes |
| Severity | Medium |
| Calamity Score (ours) | 27 / 100 |
| Our confidence | 91% |
| Coordinates | -8.4200, 109.0200 |
| Nearest City | Cilacap (77 km) |
| Population Exposed | 7.0K within 70 km |
| Impact Tier | significant |
| Timestamp | 2026-09-04T05:04:59.000Z |
| Source | https://www.bmkg.go.id/tews.html |
Score Breakdown
Technical Details
| Mag | 5.4 |
| Depth | 10 |
| Region | Pusat gempa berada di laut 77 km tenggara Cilacap |
| TsunamiPotential | true |
| Felt | III Kebumen, III Bantul, III Cilacap, III Kulonprogo, II-III Pangandaran, II Sleman, II Pacitan, III Purwokerto, II Wonogiri |
| Usgs Mag | 5.2 |
| Usgs Depth | 10 |
| Usgs Tsunami | false |
| Usgs Felt | 4 |
| Usgs Sig | 418 |
| Emsc Mag | 5.2 |
| Emsc Depth | -79 |
| Emsc MagType | mb |
| Emsc Region | JAVA, INDONESIA |
| Emsc Auth | EMSC |
| Emsc SourceId | 2055562 |
| Gfz Mag | 5.29 |
| Gfz Depth | 75 |
| Gfz MagType | mb |
| Gfz Region | Java, Indonesia |
Safety Information
If you feel shaking: Drop, Cover, and Hold On. Move away from windows, heavy objects, and exterior walls. After shaking stops, check for injuries and structural damage. Be prepared for aftershocks, which can occur minutes to months after the mainshock. Follow instructions from local emergency management authorities.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Want to know when something happens in this area?
Calamity.live data shows a earthquake event with CalamityScore 27/100, in Indonesia (Indonesia), based on data from bmkg. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.