NAMUR (BE)
Quarry blast23 March 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 14:28:132021-03-23
- UTC
- 13:28:132021-03-23
Main parameters
| Date and time | 2021-03-23 13:28:13 UTC 2021-03-23 14:28:13 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.498° N, 4.980° E Uncertainty ± 1.0 km |
| Event ID | ROB 12845 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-03-26 18:50:20 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
- 10
- Epicentral distance
- 14.7 – 91.8km
- Mean velocity, P wave
- 5.9km/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: 10 measurements, root-mean-square deviation 0.33 s. S wave: 10 measurements, root-mean-square deviation 0.51 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)9 stations | |||||
| GESGesves | 14.7 | 149 | 13:28:15.32+2.24 s | 13:28:17.34+4.26 s | 2.02 |
| CLAClavier | 24.5 | 111 | 13:28:17.24+4.16 s | 13:28:20.95+7.87 s | 3.71 |
| MRDMaredsous | 26.5 | 215 | 13:28:17.80+4.72 s | 13:28:21.80+8.72 s | 4.00 |
| TGATangissart | 34.6 | 290 | 13:28:18.78+5.70 s | 13:28:23.44+10.36 s | 4.66 |
| RCHRochefort | 42.0 | 155 | 13:28:20.58+7.50 s | 13:28:26.56+13.48 s | 5.98 |
| DOUDourbes | 52.6 | 212 | 13:28:22.56+9.48 s | 13:28:29.01+15.93 s | 6.45 |
| SKQSteenkerque | 65.9 | 285 | 13:28:23.83+10.75 s | 13:28:33.96+20.88 s | 10.13 |
| MEMHMembach | 74.0 | 80 | 13:28:26.22+13.14 s | 13:28:34.88+21.80 s | 8.66 |
| KLBKalborn | 91.8 | 118 | 13:28:28.92+15.84 s | 13:28:40.25+27.17 s | 11.33 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 73.5 | 66 | 13:28:25.67+12.59 s | 13:28:35.65+22.57 s | 9.98 |