BRABANT WALLON (BE)
Suspected induced event19 April 2011
- Magnitude
- –
- Depth
- –
- Max. int.
- 3
- Belgian time
- 10:16:542011-04-19
- UTC
- 08:16:542011-04-19
Main parameters
| Date and time | 2011-04-19 08:16:54 UTC 2011-04-19 10:16:54 Belgian time |
|---|---|
| Magnitude | – |
| Epicentral coordinates | 50.653° N, 4.602° E Uncertainty ± 10.0 km |
| Maximum intensity | 3 |
| Event ID | ROB 4512 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2016-11-24 12:11:36 Belgian time
Location map
Macroseismic inquiry
Intensities derived from the answers to the online questionnaire “Did you feel an earthquake?”, grouped by municipality (former municipalities included). The map and the chart give the intensity of each municipality.
- Answers
- 49
- Municipalities
- 11
- Farthest municipality
- 537km · GREIZ
- Countries
- Belgium, Germany
- I
- II
- III
- IV
- V
- VI
- VII+
- 3–4
- 5–9
- 10–19
- 20–49
- ≥ 50
- felt, fewer than 3 answers
- Epicentre
Answers by intensity
| Intensity | Answers | |
|---|---|---|
| I | 14 | |
| II | 12 | |
| III | 10 | |
| IV | 12 | |
| V | 1 | |
| Total | 49 |
Intensity against distance
- Intensity of the municipality (CII)
Arrival of the answers
All47 of 48 answers (98%)
- Answers at the same position (rounded to about 1 km):
- 1
- 10
- 50
- Epicentre
2 answers after +3 d, outside the chart.
Warning: the intensities derived from the inquiry are raw, unverified data.
Notes and method
Intensity of a municipality or a cell (CII, Community Internet Intensity) is computed as follows:
- I if no answer reports that the earthquake was felt;
- F earthquake felt, but fewer than 3 answers kept per municipality or cell;
- II–IX computed from 3 answer(s) kept: CII = 3.40 ln(CWS) − 4.38 (Wald et al., 1999), applied to the weighted sum (CWS) of the mean indexes of the answers; at least II if felt, at most IX.
Answers kept (USGS method, as applied by the ROB): reliability of 80 or more, given on the ground floor up to the 4th floor (or unknown floor), without those more than two standard deviations from the mean. The “felt” index is weighted by the answer to “Did others nearby feel it?”.
Distribution by intensity: macroseismic intensity (MI) recorded for each answer.
Cells: 5 or 10 km squares of the Belgian Lambert 72 grid, each answer placed at its geocoded address or at the point it placed on the map, otherwise at the centre of its municipality. The positions of the answers are published only rounded to about 1 km, in “Arrival of the answers”. Grid cell method: Van Noten et al. (2017), Solid Earth 8, 453–477, doi:10.5194/se-8-453-2017.
Arrival of the answers: time each answer of reliability 80 or more was sent, duplicates removed; position rounded to 0.01° (about 1 km), geocoded or otherwise at the centre of the municipality, where several answers may therefore pile up. Answers without a usable sending time or position, not shown: 1.
Depth not determined: distances measured from the epicentre.
Answers read on 2026-11-09 10:08.
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
257 other earthquakes in the catalogue since 1953. 7 of them occurred after this one.
Latest earthquakes before this one
| Date | Place | Magnitude | Intensity | Distance km |
|---|---|---|---|---|
| 2011-01-30 | COURT-SAINT-ETIENNE (BE) | ML 1.0 | – | 3.6 |
| 2011-01-30 | COURT-SAINT-ETIENNE (BE) | ML 1.2 | – | 4.9 |
| 2010-03-08 | BELGIUM (BE)induced | – | 3 | 3.7 |
| 2010-01-18 | COURT-SAINT-ETIENNE (BE) | ML 0.9 | 2 | 3.1 |
| 2010-01-12 | COURT-SAINT-ETIENNE (BE) | ML 0.3 | 2 | 2.3 |
Largest known earthquakes
| Date | Place | Magnitude | Intensity | Distance km |
|---|---|---|---|---|
| 1953-01-06 | COURT-SAINT-ETIENNE | ML 4.0 | 5 | 4.1 |
| 1953-08-28 | COURT-SAINT-ETIENNE | ML 3.6 | 6 | 4.1 |
| 1953-08-28 | COURT-SAINT-ETIENNE | ML 3.4 | 5 | 4.1 |
| 2008-07-13 | COURT-SAINT-ETIENNE (BE) | ML 3.2 | 3 | 2.9 |
| 2009-03-03 | COURT-SAINT-ETIENNE (BE) | ML 2.8 | 4 | 3.1 |
Municipality of Court-Saint-Etienne
230 other earthquakes in the catalogue since 1955. 5 of them occurred after this one.
Latest earthquakes before this one
| Date | Place | Magnitude | Intensity | Distance km |
|---|---|---|---|---|
| 2011-01-30 | COURT-SAINT-ETIENNE (BE) | ML 1.0 | – | 3.6 |
| 2011-01-30 | COURT-SAINT-ETIENNE (BE) | ML 1.2 | – | 4.9 |
| 2010-03-08 | BELGIUM (BE)induced | – | 3 | 3.7 |
| 2010-01-18 | COURT-SAINT-ETIENNE (BE) | ML 0.9 | 2 | 3.1 |
| 2010-01-12 | COURT-SAINT-ETIENNE (BE) | ML 0.3 | 2 | 2.3 |
Largest known earthquakes
| Date | Place | Magnitude | Intensity | Distance km |
|---|---|---|---|---|
| 2008-07-13 | COURT-SAINT-ETIENNE (BE) | ML 3.2 | 3 | 2.9 |
| 2009-03-03 | COURT-SAINT-ETIENNE (BE) | ML 2.8 | 4 | 3.1 |
| 2008-09-13 | OTTIGNIES-LOUVAIN-LA-NEUVE (BE) | ML 2.6 | 4 | 3.7 |
| 2009-12-26 | COURT-SAINT-ETIENNE (BE) | ML 2.5 | 3 | 3.7 |
| 2008-12-20 | OTTIGNIES-LOUVAIN-LA-NEUVE (BE) | ML 2.4 | 3 | 3.3 |
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.