ROCHEFORT (BE)
Quarry blast20 April 2021
- Magnitude
- 1.1ML
- Depth
- –
- Belgian time
- 11:40:202021-04-20
- UTC
- 09:40:202021-04-20
Main parameters
| Date and time | 2021-04-20 09:40:20 UTC 2021-04-20 11:40:20 Belgian time |
|---|---|
| Magnitude | ML 1.1 |
| Epicentral coordinates | 50.160° N, 5.261° E Uncertainty ± 0.4 km |
| Event ID | ROB 13195 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-22 08:12:33 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
- 2.5 – 61.0km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.4km/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 0.08 s. S wave: 6 measurements, root-mean-square deviation 0.19 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 | |||||
| RCHRochefort | 2.5 | 256 | 09:40:21.31+0.44 s | 09:40:21.65+0.78 s | 0.34 |
| GESGesves | 27.9 | 334 | 09:40:25.92+5.05 s | 09:40:29.14+8.27 s | 3.22 |
| CLAClavier | 28.9 | 6 | 09:40:26.04+5.17 s | 09:40:29.96+9.09 s | 3.92 |
| MRDMaredsous | 38.5 | 294 | 09:40:27.81+6.94 s | 09:40:32.54+11.67 s | 4.73 |
| DOUDourbes | 48.2 | 262 | 09:40:29.35+8.48 s | 09:40:35.12+14.25 s | 5.77 |
| HOUHouvegnez | 57.3 | 68 | 09:40:30.93+10.06 s | – | – |
| KLBKalborn | 61.0 | 96 | 09:40:31.51+10.64 s | 09:40:39.02+18.15 s | 7.51 |