MONS-WASMUEL
Earthquake12 April 1911
- Magnitude
- 3.1MWH
- Depth
- 2.4km ± 1.1
- Max. int.
- 4
- Belgian time
- 16:151911-04-12
- UTC
- 16:151911-04-12
Main parameters
| Date and time | 1911-04-12 16:15 UTC 1911-04-12 16:15 Belgian time |
|---|---|
| Magnitude | MWH 3.1 |
| Epicentral coordinates | 50.440° N, 3.920° E Uncertainty ± 1.8 km |
| Maximum intensity | 4 |
| Depth of hypocenter | 2.4 ± 1.1 km |
| Event ID | ROB 449 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-05 10:24:31 Belgian time
Location map
Macroseismic intensities
Intensities assessed for each municipality by the seismologists of the Royal Observatory, from the official questionnaires sent to the municipalities, letters received, the press and published studies. They make up the Belgian Traditional Macroseismic database (BTM).
- Intensity data points
- 94
- Maximum intensity
- IV
- Farthest municipality
- 22km · BASECLES
- Source quality
- C
- I
- II
- III
- IV
- V
- VI
- VII+
- Epicentre
Points by intensity
| Intensity | Points | |
|---|---|---|
| I | 71 | |
| II | 2 | |
| III | 18 | |
| IV | 3 | |
| Total | 94 |
Municipalities assessed with a range (Imin < Imax): 5. Switching between Imin and Imax shows the spread of the assessment.
List of the points (94)
Sources of the intensities
| Source | Points |
|---|---|
| Cornet (1911) | 94 |
- Cornet J (1911). Le tremblement de terre de Mons (12 avril 1911). Annales de la Société géologique de Belgique 39, 39–97.
Data point set published by Camelbeeck T, Van Noten K, Lecocq T, Hendrickx M (2022). The damaging character of shallow 20th century earthquakes in the Hainaut coal area (Belgium). Solid Earth 13, 469-495. doi:10.5194/se-13-469-2022
Belgian Traditional Macroseismic database: Neefs B, Van Noten K, Vanneste K, Camelbeeck T (2025). The Belgian traditional macroseismic (BTM) database of the twentieth century. Journal of Seismology 29, 1005–1036. doi:10.1007/s10950-024-10266-9
Data set: Neefs B, Van Noten K, Vanneste K, Camelbeeck T (2024). The Belgian Traditional Macroseismic (BTM) Database of the 20th Century [data set]. Royal Observatory of Belgium. doi:10.24414/2b5w-j029
Notes and method
For each municipality, an assessment on the European Macroseismic Scale EMS-98: minimum and maximum intensity (Imin, Imax), equal or forming a range (III–IV) that reflects the spread of the testimonies in the municipality, “F” when the earthquake was felt but no degree could be given.
Seismic activity in the area
Known earthquakes around the epicentre, from the catalogue of the Royal Observatory of Belgium.
Within 10 km of the epicentre
119 other earthquakes in the catalogue since 1887. 110 of them occurred after this one.
Latest earthquakes before this one
Municipality of Mons
54 other earthquakes in the catalogue since 1887. 45 of them occurred after this one.
Latest earthquakes before this one
Largest known earthquakes
| Date | Place | Magnitude | Intensity | Distance km |
|---|---|---|---|---|
| 1949-04-03 | HAVRE | ML 3.9 | 6 | 9.5 |
| 1949-04-14 | HAVRE | ML 3.8 | 6 | 10.2 |
| 1946-03-09 | HAVRE | ML 3.6 | 5 | 9.5 |
| 1948-12-25 | HAVRE | ML 3.5 | 5 | 9.5 |
| 1949-04-14 | HAVRE-BOUSSOIT | MWH 3.5 | 5 | 10.9 |
Notes and method
Tectonic and induced earthquakes from the Observatory’s catalogue, suspected ones included; quarry blasts, explosions and other events are not counted. Epicentral distances on the WGS84 ellipsoid.
Municipality: 2025 municipal boundaries (Statbel), applied to every earthquake, including those before the merger of municipalities. For an epicentre outside Belgium, only the circular area is given. Each earthquake’s name is the catalogue’s: it may refer to a place near the epicentre.
Magnitude: the one given on each earthquake’s page (ML preferably, otherwise MW or MS); magnitudes of different types are compared as they are.
The epicentres of historical earthquakes are only known to within a few kilometres, sometimes more: whether they fall in the area is indicative. Small earthquakes have only been recorded as the station network grew: the area’s older earthquakes are mostly the largest ones, and recent activity looks more frequent.