NAMUR (BE)
Quarry blast20 September 2022
- Magnitude
- 0.8ML
- Depth
- –
- Belgian time
- 13:23:122022-09-20
- UTC
- 11:23:122022-09-20
Main parameters
| Date and time | 2022-09-20 11:23:12 UTC 2022-09-20 13:23:12 Belgian time |
|---|---|
| Magnitude | ML 0.8 |
| Epicentral coordinates | 50.498° N, 4.904° E Uncertainty ± 2.5 km |
| Event ID | ROB 17180 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-09-26 13:28:36 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
- 18.1 – 96.6km
- Mean velocity, P wave
- 5.6km/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: 6 measurements, root-mean-square deviation 0.27 s. S wave: 4 measurements, root-mean-square deviation 0.29 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 | 18.1 | 134 | 11:23:15.28+3.07 s | 11:23:17.48+5.27 s | 2.20 |
| MRDMaredsous | 23.8 | 204 | 11:23:16.95+4.74 s | – | – |
| TGATangissart | 29.6 | 294 | 11:23:17.91+5.70 s | 11:23:20.92+8.71 s | 3.01 |
| CLAClavier | 29.6 | 107 | 11:23:17.51+5.30 s | 11:23:21.61+9.40 s | 4.10 |
| SNFSeneffe | 44.0 | 272 | 11:23:19.85+7.64 s | 11:23:25.79+13.58 s | 5.94 |
| KLBKalborn | 96.6 | 117 | 11:23:29.56+17.35 s | – | – |