ANDENNE (BE)
Quarry blast25 August 2021
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 13:47:022021-08-25
- UTC
- 11:47:022021-08-25
Main parameters
| Date and time | 2021-08-25 11:47:02 UTC 2021-08-25 13:47:02 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.488° N, 5.019° E Uncertainty ± 2.1 km |
| Event ID | ROB 14310 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-08-25 16:38:18 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
- 12.4 – 53.1km
- Mean velocity, P wave
- 5.6km/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 0.18 s. S wave: 5 measurements, root-mean-square deviation 0.33 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 | 12.4 | 157 | 11:47:04.99+2.25 s | 11:47:07.21+4.47 s | 2.22 |
| CLAClavier | 21.5 | 111 | 11:47:07.01+4.27 s | 11:47:09.04+6.30 s | 2.03 |
| MRDMaredsous | 27.3 | 221 | 11:47:07.71+4.97 s | 11:47:10.79+8.05 s | 3.08 |
| RCHRochefort | 39.9 | 158 | 11:47:10.32+7.58 s | 11:47:15.07+12.33 s | 4.75 |
| DOUDourbes | 53.1 | 215 | 11:47:12.32+9.58 s | 11:47:18.92+16.18 s | 6.60 |