NAMUR (BE)
Quarry blast24 June 2021
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:46:392021-06-24
- UTC
- 11:46:392021-06-24
Main parameters
| Date and time | 2021-06-24 11:46:39 UTC 2021-06-24 13:46:39 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.498° N, 4.939° E Uncertainty ± 3.5 km |
| Event ID | ROB 13785 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-06-28 11:10:57 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
- 5
- Epicentral distance
- 31.9 – 76.9km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.5km/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: 5 measurements, root-mean-square deviation 0.27 s. S wave: 5 measurements, root-mean-square deviation 0.17 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)5 stations | |||||
| TGATangissart | 31.9 | 292 | 11:46:44.63+5.16 s | 11:46:49.29+9.82 s | 4.66 |
| SNFSeneffe | 46.5 | 272 | 11:46:47.82+8.35 s | 11:46:53.64+14.17 s | 5.82 |
| DOUDourbes | 51.1 | 209 | 11:46:48.40+8.93 s | 11:46:54.52+15.05 s | 6.12 |
| MEMHMembach | 76.9 | 80 | 11:46:52.52+13.05 s | 11:47:01.99+22.52 s | 9.47 |
| MEMSMembach | 76.9 | 80 | 11:46:52.52+13.05 s | 11:47:02.01+22.54 s | 9.49 |