TOURNAI (BE)
Quarry blast3 May 2023
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:00:232023-05-03
- UTC
- 11:00:232023-05-03
Main parameters
| Date and time | 2023-05-03 11:00:23 UTC 2023-05-03 13:00:23 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.633° N, 3.531° E Uncertainty ± 9.9 km |
| Event ID | ROB 19415 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-05-04 11:07:59 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
- 38.9 – 192.8km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.3km/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 0.60 s. S wave: 5 measurements, root-mean-square deviation 0.45 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 | 38.9 | 87 | 11:00:29.73+6.36 s | 11:00:35.64+12.27 s | 5.91 |
| BLRGBlaregnies | 40.3 | 140 | 11:00:31.22+7.85 s | 11:00:34.80+11.43 s | 3.58 |
| BRQBracquegnies | 46.1 | 111 | 11:00:30.94+7.57 s | – | – |
| SNFSeneffe | 55.0 | 104 | 11:00:32.21+8.84 s | 11:00:39.93+16.56 s | 7.72 |
| TGATangissart | 70.2 | 92 | 11:00:34.60+11.23 s | – | – |
| DOUDourbes | 96.5 | 128 | 11:00:40.58+17.21 s | 11:00:52.16+28.79 s | 11.58 |
| GESGesves | 113.8 | 103 | 11:00:42.65+19.28 s | 11:00:57.97+34.60 s | 15.32 |
| KLBKalborn | 192.8 | 107 | 11:00:54.30+30.93 s | – | – |