TOURNAI (BE)
Quarry blast28 July 2022
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:00:072022-07-28
- UTC
- 11:00:072022-07-28
Main parameters
| Date and time | 2022-07-28 11:00:07 UTC 2022-07-28 13:00:07 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.669° N, 3.422° E Uncertainty ± 8.2 km |
| Event ID | ROB 16710 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-08-08 11:12:31 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
- 46.6 – 201.3km
- Mean velocity, P wave
- 5.6km/s
- Mean velocity, S wave
- 3.2km/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 0.36 s. S wave: 4 measurements, root-mean-square deviation 0.79 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)8 stations | |||||
| SKQSteenkerque | 46.6 | 92 | 11:00:14.86+7.53 s | 11:00:20.81+13.48 s | 5.95 |
| BRQBracquegnies | 54.7 | 112 | 11:00:16.04+8.71 s | – | – |
| SNFSeneffe | 63.5 | 106 | 11:00:17.29+9.96 s | 11:00:25.04+17.71 s | 7.75 |
| MRDMaredsous | 103.9 | 113 | 11:00:25.24+17.91 s | 11:00:39.46+32.13 s | 14.22 |
| DOUDourbes | 105.0 | 127 | 11:00:24.52+17.19 s | 11:00:37.96+30.63 s | 13.44 |
| GESGesves | 122.2 | 104 | 11:00:27.45+20.12 s | 11:00:43.75+36.42 s | 16.30 |
| MEMSMembach | 183.2 | 91 | 11:00:39.49+32.16 s | – | – |
| KLBKalborn | 201.3 | 107 | 11:00:39.17+31.84 s | 11:01:01.07+53.74 s | 21.90 |