TOURNAI (BE)
Quarry blast1 June 2023
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 12:30:512023-06-01
- UTC
- 10:30:512023-06-01
Main parameters
| Date and time | 2023-06-01 10:30:51 UTC 2023-06-01 12:30:51 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.640° N, 3.505° E Uncertainty ± 4.2 km |
| Event ID | ROB 19595 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-06-03 12:57:58 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
- 25.2 – 194.8km
- Mean velocity, P wave
- 6.0km/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 0.28 s. S wave: 4 measurements, root-mean-square deviation 0.33 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 | 25.2 | 72 | 10:30:56.66+4.88 s | 10:31:00.04+8.26 s | 3.38 |
| SKQSteenkerque | 40.7 | 88 | 10:30:58.78+7.00 s | 10:31:04.35+12.57 s | 5.57 |
| BRQBracquegnies | 48.1 | 111 | 10:30:59.94+8.16 s | – | – |
| SNFSeneffe | 57.1 | 104 | 10:31:01.20+9.42 s | 10:31:08.55+16.77 s | 7.35 |
| DOUDourbes | 98.5 | 128 | 10:31:08.86+17.08 s | 10:31:21.35+29.57 s | 12.49 |
| GESGesves | 115.8 | 104 | 10:31:11.49+19.71 s | – | – |
| KLBKalborn | 194.8 | 107 | 10:31:23.26+31.48 s | – | – |