PEPINGEN (BE)
Quarry blast18 February 2021
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 14:09:192021-02-18
- UTC
- 13:09:192021-02-18
Main parameters
| Date and time | 2021-02-18 13:09:19 UTC 2021-02-18 14:09:19 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.730° N, 4.162° E Uncertainty ± 3.8 km |
| Event ID | ROB 12495 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-02-25 22:53:46 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
- 8
- Epicentral distance
- 10.7 – 77.0km
- Mean velocity, P wave
- 6.4km/s
- Mean velocity, S wave
- 3.6km/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: 8 measurements, root-mean-square deviation 0.55 s. S wave: 4 measurements, root-mean-square deviation 0.74 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)8 stations | |||||
| SKQSteenkerque | 10.7 | 213 | 13:09:22.06+2.37 s | 13:09:23.44+3.75 s | 1.38 |
| RQRRonquières | 14.5 | 162 | 13:09:22.73+3.04 s | – | – |
| UCCBUccle | 15.9 | 62 | 13:09:21.99+2.30 s | – | – |
| LESLessines | 22.6 | 265 | 13:09:24.59+4.90 s | – | – |
| TGATangissart | 29.0 | 118 | 13:09:25.01+5.32 s | 13:09:29.58+9.89 s | 4.57 |
| BOUBougnies | 40.9 | 202 | 13:09:25.98+6.29 s | – | – |
| MRDMaredsous | 64.1 | 138 | 13:09:31.09+11.40 s | 13:09:38.82+19.13 s | 7.73 |
| DOUDourbes | 77.0 | 156 | 13:09:32.63+12.94 s | 13:09:40.99+21.30 s | 8.36 |