ANDENNE (BE)
Quarry blast19 April 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 14:32:232021-04-19
- UTC
- 12:32:232021-04-19
Main parameters
| Date and time | 2021-04-19 12:32:23 UTC 2021-04-19 14:32:23 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.506° N, 5.014° E Uncertainty ± 1.9 km |
| Event ID | ROB 13180 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-19 14:40:52 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
- 6
- Epicentral distance
- 14.4 – 54.6km
- 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: 6 measurements, root-mean-square deviation 0.22 s. S wave: 5 measurements, root-mean-square deviation 0.40 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)6 stations | |||||
| GESGesves | 14.4 | 159 | 12:32:26.15+2.48 s | 12:32:28.30+4.63 s | 2.15 |
| CLAClavier | 22.6 | 115 | 12:32:28.09+4.42 s | 12:32:30.68+7.01 s | 2.59 |
| MRDMaredsous | 28.7 | 218 | 12:32:28.78+5.11 s | 12:32:32.69+9.02 s | 3.91 |
| TGATangissart | 36.5 | 288 | 12:32:29.97+6.30 s | – | – |
| RCHRochefort | 41.9 | 159 | 12:32:31.30+7.63 s | 12:32:37.31+13.64 s | 6.01 |
| DOUDourbes | 54.6 | 213 | 12:32:33.66+9.99 s | 12:32:39.92+16.25 s | 6.26 |