NAMUR (BE)
Quarry blast20 January 2020
- Magnitude
- 0.9ML
- Depth
- –
- Belgian time
- 14:39:592020-01-20
- UTC
- 13:39:592020-01-20
Main parameters
| Date and time | 2020-01-20 13:39:59 UTC 2020-01-20 14:39:59 Belgian time |
|---|---|
| Magnitude | ML 0.9 |
| Epicentral coordinates | 50.506° N, 4.903° E Uncertainty ± 0.6 km |
| Event ID | ROB 9145 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-01-20 15:33:08 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
- 8
- Epicentral distance
- 18.7 – 63.7km
- 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: 8 measurements, root-mean-square deviation 0.22 s. S wave: 4 measurements, root-mean-square deviation 0.16 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)8 stations | |||||
| GESGesves | 18.7 | 136 | 13:40:02.87+3.27 s | 13:40:05.29+5.69 s | 2.42 |
| MRDMaredsous | 24.6 | 203 | 13:40:04.29+4.69 s | 13:40:07.38+7.78 s | 3.09 |
| TGATangissart | 29.2 | 292 | 13:40:04.73+5.13 s | 13:40:08.42+8.82 s | 3.69 |
| CLAClavier | 29.9 | 109 | 13:40:05.14+5.54 s | – | – |
| RCHRochefort | 45.3 | 149 | 13:40:07.96+8.36 s | 13:40:13.05+13.45 s | 5.09 |
| DOUDourbes | 50.7 | 206 | 13:40:09.01+9.41 s | – | – |
| SKQSteenkerque | 60.4 | 286 | 13:40:10.18+10.58 s | – | – |
| EBNEben-Emael | 63.7 | 59 | 13:40:10.68+11.08 s | – | – |