YVOIR (BE)
Quarry blast23 September 2021
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 16:54:002021-09-23
- UTC
- 14:54:002021-09-23
Main parameters
| Date and time | 2021-09-23 14:54:00 UTC 2021-09-23 16:54:00 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.322° N, 4.899° E Uncertainty ± 0.8 km |
| Event ID | ROB 14480 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-09-24 18:24:31 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
- 9.6 – 41.3km
- Mean velocity, P wave
- 5.2km/s
- Mean velocity, S wave
- 3.0km/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 0.11 s. S wave: 5 measurements, root-mean-square deviation 0.16 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 | |||||
| MRDMaredsous | 9.6 | 257 | 14:54:01.96+1.39 s | 14:54:03.52+2.95 s | 1.56 |
| GESGesves | 15.1 | 62 | 14:54:03.30+2.73 s | 14:54:04.90+4.33 s | 1.60 |
| RCHRochefort | 29.8 | 128 | 14:54:06.04+5.47 s | 14:54:09.89+9.32 s | 3.85 |
| CLAClavier | 30.6 | 69 | 14:54:06.00+5.43 s | 14:54:10.30+9.73 s | 4.30 |
| DOUDourbes | 33.3 | 221 | 14:54:06.63+6.06 s | 14:54:11.32+10.75 s | 4.69 |
| TGATangissart | 41.3 | 320 | 14:54:08.07+7.50 s | – | – |