Country profile · USGS ComCat
Earthquakes in Bulgaria
Bulgaria has catalogued 36 M4+ earthquakes since 2005 (ranked 112th of 187 countries), with the strongest reaching magnitude M7.1.
Bulgaria ranks 112th of 187 countries by catalogued seismic activity - a country with limited but non-zero seismic activity, averaging about 2 M4+ events a year alongside 7 significant M6+ earthquakes since 1900. The M6+ record here is thin - 7 events in all, so a single quake moves every figure on this page.
- 36
- M4+ events (since 2005)
- 7
- Major M6+ (since 1900)
- M7.1
- Strongest
- ~2
- M4+ per year
The verdict
Bulgaria is below the global median in catalogued seismic activity, with 36 M4+ earthquakes logged since 2005 and 7 major M6+ events since 1900, the strongest reaching magnitude 7.1.
- 1904
- busiest year (2 major events)
- 14 km
- average recorded event depth
- 100%
- of events are shallow (<70 km, the most damaging kind)
Average catalogued magnitude is 4.3 - most events are moderate M4-5 tremors that are felt but rarely cause damage. On the M4+ activity ladder Malaysia sits immediately above at 37 events and Bhutan sits immediately below at 35.
Where Bulgaria sits in the catalog
Rank 112th of 187 tracked countries (40th percentile by M4+ count since 2005). On the M4+ activity ladder Malaysia sits immediately above at 37 events and Bhutan sits immediately below at 35.
Same M4+ count, broken by peak magnitude
2 tracked countries share Bulgaria's exact count of 36 M4+ events since 2005. Among that cohort, Bulgaria ranks 2nd of 2 by strongest recorded magnitude (M5.0).
| Country | M4+ count | Strongest |
|---|---|---|
| Libya | 36 | M5.2 |
| Bulgaria (this page) | 36 | M5.0 |
Major (M6+) earthquakes in Bulgaria by year
Count of significant (magnitude 6.0+) events catalogued each year
- 1904
1904: 2 major (M6+) events
2
- 1905
1905: 1 major (M6+) events
1
- 1909
1909: 1 major (M6+) events
1
- 1913
1913: 1 major (M6+) events
1
- 1928
1928: 2 major (M6+) events
2
What this shows Bulgaria's most active year for major earthquakes was 1904 (2 M6+ events). Major-quake counts are irregular, they track the episodic release of tectonic stress, not a smooth trend.
0 of 36 catalogued M4+ events since 2005 reached M6.0 or higher.
Magnitude distribution of major events
Breakdown of the 7 significant (M6+) earthquakes on record for Bulgaria.
M7.0-7.9
3
42.9%
M6.0-6.9
4
57.1%
Depth of major earthquakes
Hypocentral depth of the 7 M6+ events, shallow quakes shake the surface hardest. Average depth: 14 km.
Shallow (<70 km)
7
100.0% of events
Intermediate (70–300 km)
0
0.0% of events
Deep (>300 km)
0
0.0% of events
Strongest earthquakes in Bulgaria
The 7 most powerful events on record (USGS, since 1900).
| Mag | Location | Depth | Date |
|---|---|---|---|
| 7.1 | 3 km W of Brezovo, Bulgaria | 10.0 km | Apr 18, 1928 |
| 7.1 | 9 km S of Stara Zagora, Bulgaria | 10.0 km | Apr 14, 1928 |
| 7.0 | 7 km SE of Stara Kresna, Bulgaria | 15.0 km | Apr 4, 1904 |
| 6.8 | 6 km W of Stara Kresna, Bulgaria | 15.0 km | Apr 4, 1904 |
| 6.7 | 5 km NNE of Lyaskovets, Bulgaria | 15.0 km | Jun 14, 1913 |
| 6.1 | 15 km NE of Bobov Dol, Bulgaria | 15.0 km | Oct 8, 1905 |
| 6.1 | 11 km ENE of Elhovo, Bulgaria | 15.0 km | Feb 15, 1909 |
Significant earthquake record (7 events)
Every catalogued magnitude-6.0-and-above earthquake in Bulgaria since 1900, most recent first.
| Mag | Location | Depth | Date |
|---|---|---|---|
| 7.1 | 3 km W of Brezovo, Bulgaria | 10.0 km | Apr 18, 1928 |
| 7.1 | 9 km S of Stara Zagora, Bulgaria | 10.0 km | Apr 14, 1928 |
| 6.7 | 5 km NNE of Lyaskovets, Bulgaria | 15.0 km | Jun 14, 1913 |
| 6.1 | 11 km ENE of Elhovo, Bulgaria | 15.0 km | Feb 15, 1909 |
| 6.1 | 15 km NE of Bobov Dol, Bulgaria | 15.0 km | Oct 8, 1905 |
| 7.0 | 7 km SE of Stara Kresna, Bulgaria | 15.0 km | Apr 4, 1904 |
| 6.8 | 6 km W of Stara Kresna, Bulgaria | 15.0 km | Apr 4, 1904 |
Other countries in this catalog sample
A Bulgaria-keyed shuffle of the full 186-country roster, not the six nearest by count.
Peak-magnitude sample from the same roster
A second Bulgaria-keyed shuffle of countries with a recorded max magnitude.
Understand the data
Frequently asked questions
How many earthquakes have occurred in Bulgaria? ▼
What was the strongest earthquake in Bulgaria? ▼
How seismically active is Bulgaria? ▼
How deep are earthquakes in Bulgaria? ▼
Where does this data come from? ▼
About Bulgaria's figures
36 M4+ events since 2005 · strongest M7.1 · average M4.3 · 7 M6+ significant events since 1900 · latest M4+ catalog stamp Apr 25, 2022. Computed from the USGS Comprehensive Earthquake Catalog (ComCat). See the methodology and USGS ComCat.
Disclaimer: PlainQuake is informational only, not an emergency service or engineering advice. See our full disclaimer.
What Bulgaria's numbers mean
Bulgaria ranks 112th of 187 countries tracked - a country with limited but non-zero seismic activity.
- About 2 M4+ earthquakes strike Bulgaria per year on average, though major (M6+) activity is episodic - 1904 was the busiest year on record with 2 significant events. See the full country ranking
- 100% of Bulgaria's catalogued major earthquakes are shallow (under 70km) - shallow events generally produce stronger surface shaking than deep ones of the same magnitude. How depth affects shaking
- The strongest catalogued event reached M7.1. Compare against neighboring or similarly-ranked countries before drawing conclusions from magnitude alone. Compare strongest earthquakes
Figures reflect the USGS ComCat catalog (M4+ since 2005, M6+ significant events since 1900) - not a real-time hazard assessment. For official guidance, see the USGS Earthquake Hazards Program.
According to the US Geological Survey Earthquake Hazards Program, PlainQuake's figures are rendered directly from 315,341 recorded M4+ earthquakes and 14,428 significant M6+ events (USGS ComCat, 2005-present) -- no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026-07-19.