WALCOURT (BE)
Quarry blast4 November 2020
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 12:11:542020-11-04
- UTC
- 11:11:542020-11-04
Main parameters
| Date and time | 2020-11-04 11:11:54 UTC 2020-11-04 12:11:54 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.219° N, 4.473° E Uncertainty ± 2.0 km |
| Event ID | ROB 11250 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-11-04 14:21:32 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
- 7
- Epicentral distance
- 16.3 – 117.5km
- Mean velocity, P wave
- 3.4km/s
- Mean velocity, S wave
- 2.6km/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: 7 measurements, root-mean-square deviation 2.63 s. S wave: 5 measurements, root-mean-square deviation 1.67 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 | |||||
| DOUDourbes | 16.3 | 148 | 11:11:57.64+2.93 s | 11:12:00.24+5.53 s | 2.60 |
| MRDMaredsous | 23.0 | 66 | 11:11:58.22+3.51 s | 11:12:01.82+7.11 s | 3.60 |
| TGATangissart | 43.0 | 5 | 11:12:02.29+7.58 s | – | – |
| GESGesves | 47.5 | 67 | 11:12:03.37+8.66 s | 11:12:09.05+14.34 s | 5.68 |
| RCHRochefort | 54.3 | 97 | 11:12:04.40+9.69 s | 11:12:11.04+16.33 s | 6.64 |
| CLAClavier | 63.1 | 69 | 11:12:05.63+10.92 s | 11:12:14.11+19.40 s | 8.48 |
| MEMHMembach | 117.5 | 68 | 11:12:29.78+35.07 s | – | – |