BRAINE-LE-COMTE (BE)
Quarry blast16 September 2021
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 14:04:322021-09-16
- UTC
- 12:04:322021-09-16
Main parameters
| Date and time | 2021-09-16 12:04:32 UTC 2021-09-16 14:04:32 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.603° N, 4.123° E Uncertainty ± 1.6 km |
| Event ID | ROB 14435 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-09-16 15:46:26 Belgian time
Location map
- Epicentre
- Station that recorded the event
Arrival times at the stations
Each station first records the P wave, the fastest, then the S wave. The farther a station is from the epicentre, the later the waves reach it and the wider the gap between the two.
- Stations
- 7
- Epicentral distance
- 5.9 – 72.6km
- Mean velocity, P wave
- 6.0km/s
- Mean velocity, S wave
- 3.2km/s
- P wave
- S wave
- Curve fitted to the measurements
Notes and method
Curves: travel time of a direct wave in a homogeneous medium. The velocity of each wave and an origin-time shift, common to both, are fitted to the measurements by least squares. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 7 measurements, root-mean-square deviation 0.42 s. S wave: 4 measurements, root-mean-square deviation 0.35 s.
Station measurements
P- and S-wave arrivals and ground displacement measured at each station. Click a column heading to change the order.
| km | ° | UTC | UTC | s | |
|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)7 stations | |||||
| SKQSteenkerque | 5.9 | 329 | 12:04:33.82+1.01 s | 12:04:35.01+2.20 s | 1.19 |
| RQRRonquières | 7.2 | 88 | 12:04:34.43+1.62 s | – | – |
| BRQBracquegnies | 13.6 | 176 | 12:04:34.17+1.36 s | – | – |
| SNFSeneffe | 15.3 | 132 | 12:04:35.39+2.58 s | 12:04:38.25+5.44 s | 2.86 |
| TGATangissart | 28.2 | 89 | 12:04:37.74+4.93 s | 12:04:41.80+8.99 s | 4.06 |
| MRDMaredsous | 56.8 | 126 | 12:04:42.51+9.70 s | 12:04:50.20+17.39 s | 7.69 |
| GESGesves | 72.6 | 109 | 12:04:45.17+12.36 s | – | – |