TOURNAI (BE)
Quarry blast4 May 2020
- Magnitude
- 2.1ML
- Depth
- –
- Belgian time
- 13:01:132020-05-04
- UTC
- 11:01:132020-05-04
Main parameters
| Date and time | 2020-05-04 11:01:13 UTC 2020-05-04 13:01:13 Belgian time |
|---|---|
| Magnitude | ML 2.1 |
| Epicentral coordinates | 50.643° N, 3.442° E Uncertainty ± 4.3 km |
| Event ID | ROB 9940 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-05-04 15:06:39 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
- 8
- Epicentral distance
- 45.2 – 199.1km
- Mean velocity, P wave
- 5.9km/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 0.28 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)8 stations | |||||
| SKQSteenkerque | 45.2 | 89 | 11:01:20.73+7.66 s | 11:01:26.84+13.77 s | 6.11 |
| BOUBougnies | 45.5 | 128 | 11:01:21.09+8.02 s | – | – |
| BRQBracquegnies | 52.4 | 110 | 11:01:22.07+9.00 s | – | – |
| UCCBUccle | 67.1 | 75 | 11:01:25.21+12.14 s | 11:01:33.03+19.96 s | 7.82 |
| DOUDourbes | 102.2 | 126 | 11:01:30.41+17.34 s | 11:01:43.90+30.83 s | 13.49 |
| GESGesves | 120.2 | 103 | 11:01:33.30+20.23 s | 11:01:50.05+36.98 s | 16.75 |
| RCHRochefort | 138.1 | 112 | 11:01:36.12+23.05 s | 11:01:53.69+40.62 s | 17.57 |
| KLBKalborn | 199.1 | 107 | 11:01:45.20+32.13 s | 11:02:07.06+53.99 s | 21.86 |