CELLES (BE)
Quarry blast6 September 2021
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:00:112021-09-06
- UTC
- 11:00:112021-09-06
Main parameters
| Date and time | 2021-09-06 11:00:11 UTC 2021-09-06 13:00:11 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.659° N, 3.510° E Uncertainty ± 7.7 km |
| Event ID | ROB 14385 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-09-08 09:10:14 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
- 10
- Epicentral distance
- 24.2 – 115.9km
- Mean velocity, P wave
- 6.4km/s
- Mean velocity, S wave
- 3.5km/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: 10 measurements, root-mean-square deviation 0.53 s. S wave: 8 measurements, root-mean-square deviation 0.41 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)10 stations | |||||
| LESLessines | 24.2 | 76 | 11:00:16.09+4.79 s | – | – |
| SKQSteenkerque | 40.3 | 91 | 11:00:18.15+6.85 s | 11:00:24.00+12.70 s | 5.85 |
| BOUBougnies | 43.0 | 134 | 11:00:19.91+8.61 s | 11:00:25.25+13.95 s | 5.34 |
| BRQBracquegnies | 48.5 | 114 | 11:00:19.36+8.06 s | 11:00:25.96+14.66 s | 6.60 |
| RQRRonquières | 50.9 | 96 | 11:00:19.92+8.62 s | 11:00:26.66+15.36 s | 6.74 |
| SNFSeneffe | 57.2 | 106 | 11:00:20.56+9.26 s | 11:00:28.43+17.13 s | 7.87 |
| UCCBUccle | 61.9 | 75 | 11:00:22.83+11.53 s | 11:00:30.62+19.32 s | 7.79 |
| TGATangissart | 71.8 | 94 | 11:00:23.26+11.96 s | 11:00:32.29+20.99 s | 9.03 |
| DOUDourbes | 99.4 | 129 | 11:00:28.10+16.80 s | 11:00:40.41+29.11 s | 12.31 |
| GESGesves | 115.9 | 105 | 11:00:30.70+19.40 s | – | – |