NAMUR (BE)
Quarry blast15 June 2021
- Magnitude
- 1.1ML
- Depth
- –
- Belgian time
- 13:44:522021-06-15
- UTC
- 11:44:522021-06-15
Main parameters
| Date and time | 2021-06-15 11:44:52 UTC 2021-06-15 13:44:52 Belgian time |
|---|---|
| Magnitude | ML 1.1 |
| Epicentral coordinates | 50.497° N, 4.967° E Uncertainty ± 1.8 km |
| Event ID | ROB 13690 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-06-18 11:15:52 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
- 8
- Epicentral distance
- 15.1 – 75.0km
- Mean velocity, P wave
- 5.2km/s
- Mean velocity, S wave
- 2.9km/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 0.40 s. S wave: 6 measurements, root-mean-square deviation 0.79 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)7 stations | |||||
| GESGesves | 15.1 | 146 | 11:44:54.20+2.17 s | 11:44:56.52+4.49 s | 2.32 |
| CLAClavier | 25.3 | 110 | 11:44:56.50+4.47 s | 11:44:59.28+7.25 s | 2.78 |
| MRDMaredsous | 25.9 | 213 | 11:44:56.89+4.86 s | 11:44:59.64+7.61 s | 2.75 |
| TGATangissart | 33.8 | 291 | 11:44:57.83+5.80 s | 11:45:02.40+10.37 s | 4.57 |
| SNFSeneffe | 48.5 | 272 | 11:45:00.54+8.51 s | – | – |
| DOUDourbes | 52.0 | 211 | 11:45:01.34+9.31 s | 11:45:08.01+15.98 s | 6.67 |
| MEMHMembach | 75.0 | 80 | 11:45:05.07+13.04 s | 11:45:18.38+26.35 s | 13.31 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 74.4 | 66 | 11:45:05.02+12.99 s | – | – |