WELLIN (BE)
Quarry blast5 July 2021
- Magnitude
- 0.9ML
- Depth
- –
- Belgian time
- 13:10:152021-07-05
- UTC
- 11:10:152021-07-05
Main parameters
| Date and time | 2021-07-05 11:10:15 UTC 2021-07-05 13:10:15 Belgian time |
|---|---|
| Magnitude | ML 0.9 |
| Epicentral coordinates | 50.073° N, 5.119° E Uncertainty ± 1.6 km |
| Event ID | ROB 13880 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-07-06 17:06:37 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
- 11.9 – 40.6km
- 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 0.08 s. S wave: 4 measurements, root-mean-square deviation 0.18 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 | 11.9 | 40 | 11:10:17.75+2.34 s | 11:10:19.42+4.01 s | 1.67 |
| MRDMaredsous | 35.7 | 316 | 11:10:21.70+6.29 s | 11:10:26.33+10.92 s | 4.63 |
| DOUDourbes | 37.6 | 274 | 11:10:22.23+6.82 s | 11:10:27.04+11.63 s | 4.81 |
| CLAClavier | 40.6 | 19 | 11:10:22.60+7.19 s | 11:10:28.29+12.88 s | 5.69 |