TOURNAI (BE)
Quarry blast8 February 2023
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:31:072023-02-08
- UTC
- 12:31:072023-02-08
Main parameters
| Date and time | 2023-02-08 12:31:07 UTC 2023-02-08 13:31:07 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.588° N, 3.570° E Uncertainty ± 11.2 km |
| Event ID | ROB 18595 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-02-08 18:31:41 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
- 7
- Epicentral distance
- 36.7 – 124.3km
- Mean velocity, P wave
- 5.6km/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: 6 measurements, root-mean-square deviation 0.15 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)7 stations | |||||
| SKQSteenkerque | 36.7 | 79 | 12:31:14.16+6.27 s | 12:31:19.68+11.79 s | 5.52 |
| BRQBracquegnies | 41.9 | 106 | 12:31:15.28+7.39 s | – | – |
| RQRRonquières | 46.4 | 87 | 12:31:15.77+7.88 s | – | – |
| SNFSeneffe | 51.3 | 99 | 12:31:16.59+8.70 s | 12:31:22.44+14.55 s | 5.85 |
| MRDMaredsous | 90.9 | 110 | 12:31:23.72+15.83 s | – | – |
| DOUDourbes | 91.3 | 127 | 12:31:24.08+16.19 s | – | – |
| CLAClavier | 124.3 | 98 | 12:31:29.18+21.29 s | – | – |