NAMUR (BE)
Quarry blast7 February 2020
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 14:22:042020-02-07
- UTC
- 13:22:042020-02-07
Main parameters
| Date and time | 2020-02-07 13:22:04 UTC 2020-02-07 14:22:04 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.475° N, 4.949° E Uncertainty ± 1.4 km |
| Event ID | ROB 9270 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-02-10 12:51:20 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
- 14.0 – 73.5km
- Mean velocity, P wave
- 5.3km/s
- Mean velocity, S wave
- 3.2km/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 0.29 s. S wave: 7 measurements, root-mean-square deviation 0.43 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 | 14.0 | 135 | 13:22:06.83+2.16 s | 13:22:08.78+4.11 s | 1.95 |
| MRDMaredsous | 23.1 | 214 | 13:22:09.13+4.46 s | 13:22:12.05+7.38 s | 2.92 |
| CLAClavier | 25.8 | 104 | 13:22:08.79+4.12 s | 13:22:12.05+7.38 s | 3.26 |
| TGATangissart | 33.5 | 296 | 13:22:10.43+5.76 s | 13:22:14.45+9.78 s | 4.02 |
| RCHRochefort | 40.7 | 151 | 13:22:11.87+7.20 s | 13:22:17.16+12.49 s | 5.29 |
| DOUDourbes | 49.2 | 211 | 13:22:13.92+9.25 s | 13:22:20.42+15.75 s | 6.50 |
| Dutch seismic network (KNMI)1 station | |||||
| VKBValkenburg | 73.5 | 53 | 13:22:18.21+13.54 s | 13:22:26.75+22.08 s | 8.54 |