TOURNAI (BE)
Quarry blast2 May 2023
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 12:32:302023-05-02
- UTC
- 10:32:302023-05-02
Main parameters
| Date and time | 2023-05-02 10:32:30 UTC 2023-05-02 12:32:30 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.674° N, 3.417° E Uncertainty ± 3.4 km |
| Event ID | ROB 19385 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-05-03 10:55:16 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
- 47.0 – 201.8km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.4km/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 0.22 s. S wave: 5 measurements, root-mean-square deviation 0.24 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 | 47.0 | 93 | 10:32:38.62+8.14 s | 10:32:44.46+13.98 s | 5.84 |
| BLRGBlaregnies | 49.2 | 136 | 10:32:38.76+8.28 s | 10:32:45.50+15.02 s | 6.74 |
| SNFSeneffe | 64.1 | 106 | 10:32:41.03+10.55 s | 10:32:49.34+18.86 s | 8.31 |
| MRDMaredsous | 104.5 | 113 | 10:32:48.42+17.94 s | 10:33:01.62+31.14 s | 13.20 |
| DOUDourbes | 105.7 | 127 | 10:32:48.78+18.30 s | 10:33:01.59+31.11 s | 12.81 |
| GESGesves | 122.7 | 105 | 10:32:51.68+21.20 s | 10:33:07.88+37.40 s | 16.20 |
| CLAClavier | 136.6 | 101 | 10:32:54.41+23.93 s | – | – |
| KLBKalborn | 201.8 | 107 | 10:33:02.38+31.90 s | 10:33:26.50+56.02 s | 24.12 |