OUFFET (BE)
Quarry blast21 April 2020
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 11:56:292020-04-21
- UTC
- 09:56:292020-04-21
Main parameters
| Date and time | 2020-04-21 09:56:29 UTC 2020-04-21 11:56:29 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.436° N, 5.438° E Uncertainty ± 1.3 km |
| Event ID | ROB 9850 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-04-21 12:18:38 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
- 9
- Epicentral distance
- 9.9 – 50.5km
- Mean velocity, P wave
- 5.8km/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: 9 measurements, root-mean-square deviation 0.30 s. S wave: 6 measurements, root-mean-square deviation 0.41 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 | |||||
| CLAClavier | 9.9 | 259 | 09:56:31.67+1.85 s | 09:56:33.30+3.48 s | 1.63 |
| GESGesves | 25.6 | 257 | 09:56:34.83+5.01 s | 09:56:38.40+8.58 s | 3.57 |
| RCHRochefort | 34.7 | 206 | 09:56:35.87+6.05 s | 09:56:40.36+10.54 s | 4.49 |
| HOUHouvegnez | 41.3 | 103 | 09:56:37.61+7.79 s | 09:56:42.48+12.66 s | 4.87 |
| MEMSMembach | 44.9 | 64 | 09:56:38.25+8.43 s | – | – |
| MEMHMembach | 44.9 | 64 | 09:56:38.25+8.43 s | 09:56:43.39+13.57 s | 5.14 |
| MRGMont Rigi | 46.0 | 79 | 09:56:38.42+8.60 s | 09:56:44.82+15.00 s | 6.40 |
| MRDMaredsous | 50.0 | 253 | 09:56:38.84+9.02 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 50.5 | 44 | 09:56:38.37+8.55 s | – | – |