YVOIR (BE)
Quarry blast23 April 2021
- Magnitude
- 0.9ML
- Depth
- –
- Belgian time
- 15:08:252021-04-23
- UTC
- 13:08:252021-04-23
Main parameters
| Date and time | 2021-04-23 13:08:25 UTC 2021-04-23 15:08:25 Belgian time |
|---|---|
| Magnitude | ML 0.9 |
| Epicentral coordinates | 50.341° N, 4.893° E Uncertainty ± 2.6 km |
| Event ID | ROB 13200 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-23 17:56:24 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
- 4
- Epicentral distance
- 9.9 – 31.5km
- 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: 4 measurements, root-mean-square deviation 0.29 s. S wave: 4 measurements, root-mean-square deviation 0.24 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)4 stations | |||||
| MRDMaredsous | 9.9 | 244 | 13:08:27.59+1.63 s | 13:08:29.56+3.60 s | 1.97 |
| GESGesves | 14.7 | 70 | 13:08:28.84+2.88 s | 13:08:31.10+5.14 s | 2.26 |
| CLAClavier | 30.4 | 73 | 13:08:31.82+5.86 s | 13:08:35.20+9.24 s | 3.38 |
| RCHRochefort | 31.5 | 131 | 13:08:31.56+5.60 s | 13:08:35.86+9.90 s | 4.30 |