ANDENNE (BE)
Quarry blast18 May 2021
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 14:30:112021-05-18
- UTC
- 12:30:112021-05-18
Main parameters
| Date and time | 2021-05-18 12:30:11 UTC 2021-05-18 14:30:11 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.503° N, 5.008° E Uncertainty ± 3.3 km |
| Event ID | ROB 13470 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-05-19 10:38:35 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
- 14.3 – 54.1km
- 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 0.19 s. S wave: 5 measurements, root-mean-square deviation 0.31 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 | |||||
| GESGesves | 14.3 | 157 | 12:30:14.17+2.52 s | 12:30:16.10+4.45 s | 1.93 |
| CLAClavier | 22.9 | 114 | 12:30:15.89+4.24 s | 12:30:19.05+7.40 s | 3.16 |
| MRDMaredsous | 28.1 | 217 | 12:30:16.39+4.74 s | 12:30:20.61+8.96 s | 4.22 |
| RCHRochefort | 41.8 | 158 | 12:30:19.23+7.58 s | 12:30:25.03+13.38 s | 5.80 |
| DOUDourbes | 54.1 | 213 | 12:30:21.38+9.73 s | 12:30:27.93+16.28 s | 6.55 |