WELLIN (BE)
Quarry blast28 July 2020
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 12:56:062020-07-28
- UTC
- 10:56:062020-07-28
Main parameters
| Date and time | 2020-07-28 10:56:06 UTC 2020-07-28 12:56:06 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.087° N, 5.153° E Uncertainty ± 0.7 km |
| Event ID | ROB 10560 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-07-28 14:41:57 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
- 9.2 – 93.5km
- Mean velocity, P wave
- 5.7km/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: 8 measurements, root-mean-square deviation 0.16 s. S wave: 5 measurements, root-mean-square deviation 0.19 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)7 stations | |||||
| RCHRochefort | 9.2 | 35 | 10:56:08.17+1.39 s | 10:56:10.07+3.29 s | 1.90 |
| GESGesves | 33.5 | 352 | 10:56:12.77+5.99 s | 10:56:17.26+10.48 s | 4.49 |
| MRDMaredsous | 36.5 | 311 | 10:56:13.37+6.59 s | 10:56:17.88+11.10 s | 4.51 |
| CLAClavier | 38.4 | 16 | 10:56:13.45+6.67 s | 10:56:18.75+11.97 s | 5.30 |
| DOUDourbes | 40.0 | 272 | 10:56:13.87+7.09 s | 10:56:19.08+12.30 s | 5.21 |
| HOUHouvegnez | 67.7 | 64 | 10:56:18.58+11.80 s | – | – |
| KLBKalborn | 68.4 | 88 | 10:56:18.60+11.82 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 93.5 | 36 | 10:56:23.34+16.56 s | – | – |