NAMUR (BE)
Quarry blast8 March 2021
- Magnitude
- 0.8ML
- Depth
- –
- Belgian time
- 12:59:312021-03-08
- UTC
- 11:59:312021-03-08
Main parameters
| Date and time | 2021-03-08 11:59:31 UTC 2021-03-08 12:59:31 Belgian time |
|---|---|
| Magnitude | ML 0.8 |
| Epicentral coordinates | 50.497° N, 4.913° E Uncertainty ± 1.2 km |
| Event ID | ROB 12735 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-03-09 18:26:16 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
- 17.6 – 50.2km
- Mean velocity, P wave
- 6.1km/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: 6 measurements, root-mean-square deviation 0.27 s. S wave: 5 measurements, root-mean-square deviation 0.21 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 | 17.6 | 135 | 11:59:34.24+3.03 s | 11:59:36.78+5.57 s | 2.54 |
| MRDMaredsous | 24.0 | 206 | 11:59:35.66+4.45 s | 11:59:39.17+7.96 s | 3.51 |
| CLAClavier | 28.9 | 107 | 11:59:36.50+5.29 s | 11:59:40.82+9.61 s | 4.32 |
| TGATangissart | 30.2 | 294 | 11:59:36.13+4.92 s | 11:59:40.91+9.70 s | 4.78 |
| SNFSeneffe | 44.7 | 272 | 11:59:39.28+8.07 s | – | – |
| DOUDourbes | 50.2 | 207 | 11:59:39.60+8.39 s | 11:59:46.83+15.62 s | 7.23 |