WELLIN (BE)
Quarry blast12 April 2021
- Magnitude
- 1.0ML
- Depth
- –
- Belgian time
- 13:01:332021-04-12
- UTC
- 11:01:332021-04-12
Main parameters
| Date and time | 2021-04-12 11:01:33 UTC 2021-04-12 13:01:33 Belgian time |
|---|---|
| Magnitude | ML 1.0 |
| Epicentral coordinates | 50.060° N, 5.108° E Uncertainty ± 1.1 km |
| Event ID | ROB 13120 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-14 16:02:03 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
- 13.6 – 71.9km
- Mean velocity, P wave
- 6.4km/s
- Mean velocity, S wave
- 3.4km/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 0.21 s. S wave: 4 measurements, root-mean-square deviation 0.10 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 | |||||
| RCHRochefort | 13.6 | 39 | 11:01:35.79+2.69 s | 11:01:37.74+4.64 s | 1.95 |
| GESGesves | 36.2 | 358 | 11:01:39.79+6.69 s | 11:01:44.13+11.03 s | 4.34 |
| DOUDourbes | 36.9 | 276 | 11:01:39.69+6.59 s | 11:01:44.47+11.37 s | 4.78 |
| HOUHouvegnez | 71.9 | 63 | 11:01:44.88+11.78 s | 11:01:54.76+21.66 s | 9.88 |