TOURNAI (BE)
Quarry blast17 April 2020
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 11:52:462020-04-17
- UTC
- 09:52:462020-04-17
Main parameters
| Date and time | 2020-04-17 09:52:46 UTC 2020-04-17 11:52:46 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.614° N, 3.480° E Uncertainty ± 5.7 km |
| Event ID | ROB 9840 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-04-17 12:27:54 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
- 11
- Epicentral distance
- 27.9 – 208.2km
- Mean velocity, P wave
- 6.0km/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: 8 measurements, root-mean-square deviation 0.19 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)11 stations | |||||
| LESLessines | 27.9 | 67 | 09:52:51.01+4.92 s | 09:52:54.99+8.90 s | 3.98 |
| BOUBougnies | 41.4 | 127 | 09:52:53.37+7.28 s | – | – |
| SKQSteenkerque | 42.6 | 84 | 09:52:53.23+7.14 s | – | – |
| BRQBracquegnies | 48.8 | 107 | 09:52:54.39+8.30 s | – | – |
| UCCBUccle | 65.4 | 71 | 09:52:57.47+11.38 s | – | – |
| MRDMaredsous | 97.8 | 110 | 09:53:02.30+16.21 s | – | – |
| DOUDourbes | 98.1 | 126 | 09:53:02.93+16.84 s | 09:53:16.22+30.13 s | 13.29 |
| GESGesves | 116.8 | 102 | 09:53:05.70+19.61 s | – | – |
| DSLBDessel | 131.0 | 58 | 09:53:08.75+22.66 s | – | – |
| KLBKalborn | 195.6 | 106 | 09:53:17.66+31.57 s | 09:53:39.58+53.49 s | 21.92 |
| VIAVianden | 208.2 | 110 | 09:53:20.81+34.72 s | – | – |