TOURNAI (BE)
Quarry blast30 May 2023
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 13:01:452023-05-30
- UTC
- 11:01:452023-05-30
Main parameters
| Date and time | 2023-05-30 11:01:45 UTC 2023-05-30 13:01:45 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.663° N, 3.575° E Uncertainty ± 9.2 km |
| Event ID | ROB 19565 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-05-31 17:17:59 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
- 7
- Epicentral distance
- 19.7 – 190.8km
- 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: 6 measurements, root-mean-square deviation 0.77 s. S wave: 6 measurements, root-mean-square deviation 0.64 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 | |||||
| LESLessines | 19.7 | 74 | 11:01:49.55+3.91 s | 11:01:53.26+7.62 s | 3.71 |
| SKQSteenkerque | 35.7 | 92 | 11:01:51.49+5.85 s | 11:01:56.57+10.93 s | 5.08 |
| BLRGBlaregnies | 41.1 | 146 | 11:01:52.61+6.97 s | 11:01:58.07+12.43 s | 5.46 |
| RQRRonquières | 46.4 | 98 | 11:01:53.06+7.42 s | 11:01:59.61+13.97 s | 6.55 |
| SNFSeneffe | 53.0 | 108 | 11:01:53.86+8.22 s | 11:02:01.37+15.73 s | 7.51 |
| DOUDourbes | 96.2 | 131 | 11:02:03.53+17.89 s | 11:02:14.35+28.71 s | 10.82 |
| KLBKalborn | 190.8 | 108 | 11:02:15.76+30.12 s | – | – |