TOURNAI (BE)
Quarry blast2 May 2023
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 13:00:032023-05-02
- UTC
- 11:00:032023-05-02
Main parameters
| Date and time | 2023-05-02 11:00:03 UTC 2023-05-02 13:00:03 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.716° N, 3.415° E Uncertainty ± 4.4 km |
| Event ID | ROB 19390 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-05-03 10:55:47 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
- 47.6 – 203.4km
- Mean velocity, P wave
- 6.4km/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.
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 | 47.6 | 99 | 11:00:12.18+8.90 s | 11:00:17.77+14.49 s | 5.59 |
| BRQBracquegnies | 57.4 | 117 | 11:00:13.78+10.50 s | – | – |
| RQRRonquières | 58.6 | 102 | 11:00:13.38+10.10 s | – | – |
| SNFSeneffe | 65.6 | 110 | 11:00:14.63+11.35 s | – | – |
| DOUDourbes | 108.7 | 129 | 11:00:21.55+18.27 s | 11:00:35.35+32.07 s | 13.80 |
| CLAClavier | 137.7 | 103 | 11:00:26.17+22.89 s | – | – |
| KLBKalborn | 203.4 | 109 | 11:00:35.48+32.20 s | 11:00:59.41+56.13 s | 23.93 |