TOURNAI (BE)
Quarry blast1 December 2020
- Magnitude
- 2.2ML
- Depth
- –
- Belgian time
- 13:09:222020-12-01
- UTC
- 12:09:222020-12-01
Main parameters
| Date and time | 2020-12-01 12:09:22 UTC 2020-12-01 13:09:22 Belgian time |
|---|---|
| Magnitude | ML 2.2 |
| Epicentral coordinates | 50.669° N, 3.413° E Uncertainty ± 3.9 km |
| Event ID | ROB 11450 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-12-02 23:05:22 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
- 47.2 – 201.9km
- Mean velocity, P wave
- 5.9km/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: 5 measurements, root-mean-square deviation 0.12 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)9 stations | |||||
| SKQSteenkerque | 47.2 | 93 | 12:09:30.76+8.53 s | 12:09:36.69+14.46 s | 5.93 |
| BRQBracquegnies | 55.4 | 112 | 12:09:32.01+9.78 s | – | – |
| RQRRonquières | 57.9 | 97 | 12:09:32.28+10.05 s | – | – |
| UCCBUccle | 68.4 | 78 | 12:09:34.41+12.18 s | 12:09:42.04+19.81 s | 7.63 |
| DOUDourbes | 105.6 | 127 | 12:09:40.60+18.37 s | 12:09:52.70+30.47 s | 12.10 |
| GESGesves | 122.9 | 104 | 12:09:41.95+19.72 s | 12:09:59.23+37.00 s | 17.28 |
| CLAClavier | 136.8 | 101 | 12:09:45.80+23.57 s | 12:10:02.99+40.76 s | 17.19 |
| RCHRochefort | 141.1 | 113 | 12:09:46.09+23.86 s | 12:10:03.48+41.25 s | 17.39 |
| KLBKalborn | 201.9 | 107 | 12:09:54.55+32.32 s | 12:10:17.50+55.27 s | 22.95 |