TOURNAI (BE)
Quarry blast3 March 2023
- Magnitude
- 1.4ML
- Depth
- 20.0km ± 6.2
- Belgian time
- 13:00:042023-03-03
- UTC
- 12:00:042023-03-03
Main parameters
| Date and time | 2023-03-03 12:00:04 UTC 2023-03-03 13:00:04 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.695° N, 3.545° E Uncertainty ± 6.6 km |
| Depth of hypocenter | 20.0 ± 6.2 km |
| Event ID | ROB 18970 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-03-04 11:17:29 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
- 6
- Epicentral distance
- 21.1 – 194.0km
- Mean velocity, P wave
- 6.2km/s
- Mean velocity, S wave
- 3.5km/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. Hypocenter at a depth of 20.0 km. P wave: 5 measurements, root-mean-square deviation 0.31 s. S wave: 4 measurements, root-mean-square deviation 0.55 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)6 stations | |||||
| LESLessines | 21.1 | 85 | 12:00:09.45+5.09 s | 12:00:13.32+8.96 s | 3.87 |
| SKQSteenkerque | 38.2 | 98 | 12:00:11.33+6.97 s | 12:00:16.89+12.53 s | 5.56 |
| BRQBracquegnies | 48.2 | 119 | 12:00:12.49+8.13 s | – | – |
| SNFSeneffe | 56.2 | 111 | 12:00:13.69+9.33 s | 12:00:20.55+16.19 s | 6.86 |
| DOUDourbes | 100.2 | 131 | 12:00:21.25+16.89 s | 12:00:33.81+29.45 s | 12.56 |
| KLBKalborn | 194.0 | 109 | 12:00:35.82+31.46 s | – | – |