TOURNAI (BE)
Quarry blast19 February 2018
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 12:32:522018-02-19
- UTC
- 11:32:522018-02-19
Main parameters
| Date and time | 2018-02-19 11:32:52 UTC 2018-02-19 12:32:52 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.648° N, 3.451° E Uncertainty ± 8.7 km |
| Event ID | ROB 6340 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-02-19 13:28:59 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
- 12
- Epicentral distance
- 44.5 – 198.7km
- 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: 8 measurements, root-mean-square deviation 0.34 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)12 stations | |||||
| SKQSteenkerque | 44.5 | 90 | 11:33:00.67+8.07 s | – | – |
| BOUBougnies | 45.3 | 129 | 11:33:00.03+7.43 s | – | – |
| BRQBracquegnies | 52.0 | 111 | 11:33:01.80+9.20 s | – | – |
| RQRRonquières | 55.0 | 95 | 11:33:02.01+9.41 s | – | – |
| UCCSUccle | 66.3 | 75 | 11:33:03.35+10.75 s | – | – |
| MRDMaredsous | 101.1 | 112 | 11:33:09.98+17.38 s | – | – |
| DOUDourbes | 102.0 | 127 | 11:33:09.64+17.04 s | 11:33:23.81+31.21 s | 14.17 |
| GESGesves | 119.7 | 103 | 11:33:13.20+20.60 s | – | – |
| MOLSMol | 131.0 | 61 | 11:33:14.79+22.19 s | – | – |
| CLAClavier | 133.7 | 100 | 11:33:15.21+22.61 s | – | – |
| LCHLa Chartreuse | 152.0 | 90 | 11:33:18.76+26.16 s | – | – |
| KLBKalborn | 198.7 | 107 | 11:33:25.01+32.41 s | – | – |