ROCHEFORT (BE)
Quarry blast1 December 2021
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 12:57:552021-12-01
- UTC
- 11:57:552021-12-01
Main parameters
| Date and time | 2021-12-01 11:57:55 UTC 2021-12-01 12:57:55 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.179° N, 5.236° E Uncertainty ± 1.0 km |
| Event ID | ROB 14910 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-12-06 14:05:07 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
- 2.7 – 63.0km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.6km/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 0.16 s. S wave: 5 measurements, root-mean-square deviation 0.25 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 | 2.7 | 194 | 11:57:56.40+0.74 s | 11:57:57.06+1.40 s | 0.66 |
| GESGesves | 25.3 | 335 | 11:58:00.43+4.77 s | 11:58:03.20+7.54 s | 2.77 |
| CLAClavier | 27.1 | 10 | 11:58:00.50+4.84 s | 11:58:04.30+8.64 s | 3.80 |
| DOUDourbes | 46.8 | 259 | 11:58:04.00+8.34 s | 11:58:09.07+13.41 s | 5.07 |
| KLBKalborn | 63.0 | 98 | 11:58:06.50+10.84 s | 11:58:13.69+18.03 s | 7.19 |