YVOIR (BE)
Quarry blast23 August 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 13:35:272021-08-23
- UTC
- 11:35:272021-08-23
Main parameters
| Date and time | 2021-08-23 11:35:27 UTC 2021-08-23 13:35:27 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.341° N, 4.989° E Uncertainty ± 1.5 km |
| Event ID | ROB 14300 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-08-23 14:04:14 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
- 8.5 – 39.3km
- Mean velocity, P wave
- 5.7km/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 0.22 s. S wave: 5 measurements, root-mean-square deviation 0.27 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 | |||||
| GESGesves | 8.5 | 55 | 11:35:28.96+1.50 s | 11:35:30.61+3.15 s | 1.65 |
| MRDMaredsous | 16.4 | 255 | 11:35:30.98+3.52 s | 11:35:32.64+5.18 s | 1.66 |
| CLAClavier | 23.9 | 69 | 11:35:32.07+4.61 s | 11:35:34.32+6.86 s | 2.25 |
| RCHRochefort | 26.8 | 141 | 11:35:32.65+5.19 s | 11:35:35.90+8.44 s | 3.25 |
| DOUDourbes | 39.3 | 226 | 11:35:34.66+7.20 s | 11:35:39.18+11.72 s | 4.52 |