TOURNAI (BE)
Quarry blast10 June 2021
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:04:302021-06-10
- UTC
- 11:04:302021-06-10
Main parameters
| Date and time | 2021-06-10 11:04:30 UTC 2021-06-10 13:04:30 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.604° N, 3.471° E Uncertainty ± 4.6 km |
| Event ID | ROB 13645 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-06-10 17:19:37 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
- 41.3 – 179.7km
- Mean velocity, P wave
- 5.7km/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 0.31 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 | |||||
| BOUBougnies | 41.3 | 125 | 11:04:37.59+6.83 s | – | – |
| SKQSteenkerque | 43.4 | 83 | 11:04:38.03+7.27 s | 11:04:43.88+13.12 s | 5.85 |
| SNFSeneffe | 58.5 | 100 | 11:04:40.51+9.75 s | – | – |
| DOUDourbes | 98.0 | 125 | 11:04:48.09+17.33 s | 11:04:59.75+28.99 s | 11.66 |
| GESGesves | 117.2 | 101 | 11:04:50.50+19.74 s | 11:05:05.57+34.81 s | 15.07 |
| MEMHMembach | 179.7 | 89 | 11:05:00.72+29.96 s | 11:05:21.76+51.00 s | 21.04 |