ROCHEFORT (BE)
Quarry blast30 November 2021
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 12:14:432021-11-30
- UTC
- 11:14:432021-11-30
Main parameters
| Date and time | 2021-11-30 11:14:43 UTC 2021-11-30 12:14:43 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.173° N, 5.235° E Uncertainty ± 2.2 km |
| Event ID | ROB 14885 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-12-06 13:49:52 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
- 5
- Epicentral distance
- 2.1 – 57.9km
- Mean velocity, P wave
- 5.7km/s
- Mean velocity, S wave
- 3.3km/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: 5 measurements, root-mean-square deviation 0.32 s. S wave: 4 measurements, root-mean-square deviation 0.24 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)5 stations | |||||
| RCHRochefort | 2.1 | 196 | 11:14:44.02+0.17 s | 11:14:44.81+0.96 s | 0.79 |
| GESGesves | 25.8 | 336 | 11:14:48.60+4.75 s | 11:14:52.22+8.37 s | 3.62 |
| MRDMaredsous | 36.3 | 293 | 11:14:50.88+7.03 s | 11:14:54.74+10.89 s | 3.86 |
| DOUDourbes | 46.6 | 259 | 11:14:52.28+8.43 s | 11:14:57.95+14.10 s | 5.67 |
| LCHLa Chartreuse | 57.9 | 26 | 11:14:53.89+10.04 s | – | – |