YVOIR (BE)
Quarry blast29 January 2021
- Magnitude
- 0.9ML
- Depth
- –
- Belgian time
- 14:23:242021-01-29
- UTC
- 13:23:242021-01-29
Main parameters
| Date and time | 2021-01-29 13:23:24 UTC 2021-01-29 14:23:24 Belgian time |
|---|---|
| Magnitude | ML 0.9 |
| Epicentral coordinates | 50.338° N, 4.880° E Uncertainty ± 1.5 km |
| Event ID | ROB 12175 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-02-08 00:16:34 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
- 8.9 – 33.8km
- Mean velocity, P wave
- 5.6km/s
- Mean velocity, S wave
- 3.2km/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 0.14 s. S wave: 5 measurements, root-mean-square deviation 0.40 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 | |||||
| MRDMaredsous | 8.9 | 243 | 13:23:26.10+1.46 s | 13:23:27.66+3.02 s | 1.56 |
| GESGesves | 15.7 | 70 | 13:23:27.61+2.97 s | 13:23:29.72+5.08 s | 2.11 |
| CLAClavier | 31.4 | 73 | 13:23:30.37+5.73 s | 13:23:35.11+10.47 s | 4.74 |
| RCHRochefort | 32.1 | 129 | 13:23:30.34+5.70 s | 13:23:34.11+9.47 s | 3.77 |
| DOUDourbes | 33.8 | 217 | 13:23:30.91+6.27 s | 13:23:35.43+10.79 s | 4.52 |