TOURNAI (BE)
Quarry blast22 January 2021
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:00:122021-01-22
- UTC
- 12:00:122021-01-22
Main parameters
| Date and time | 2021-01-22 12:00:12 UTC 2021-01-22 13:00:12 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.633° N, 3.528° E Uncertainty ± 6.1 km |
| Event ID | ROB 11970 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-01-23 18:38:14 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
- 10
- Epicentral distance
- 39.1 – 193.0km
- Mean velocity, P wave
- 6.0km/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 0.08 s.
Stations farther than 120 km are left out of the fit: the first waves to reach them have travelled beneath the crust, through the mantle, where they propagate faster.
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)10 stations | |||||
| SKQSteenkerque | 39.1 | 87 | 12:00:19.60+6.83 s | 12:00:25.57+12.80 s | 5.97 |
| BOUBougnies | 40.1 | 132 | 12:00:19.98+7.21 s | – | – |
| BRQBracquegnies | 46.3 | 111 | 12:00:20.90+8.13 s | – | – |
| RQRRonquières | 49.4 | 93 | 12:00:21.39+8.62 s | – | – |
| MRDMaredsous | 95.4 | 112 | 12:00:29.07+16.30 s | – | – |
| DOUDourbes | 96.7 | 128 | 12:00:29.41+16.64 s | 12:00:42.73+29.96 s | 13.32 |
| GESGesves | 114.0 | 103 | 12:00:32.11+19.34 s | 12:00:48.23+35.46 s | 16.12 |
| CLAClavier | 128.0 | 100 | 12:00:34.74+21.97 s | 12:00:51.97+39.20 s | 17.23 |
| RCHRochefort | 132.0 | 113 | 12:00:35.15+22.38 s | 12:00:52.03+39.26 s | 16.88 |
| KLBKalborn | 193.0 | 107 | 12:00:43.68+30.91 s | 12:01:05.99+53.22 s | 22.31 |