TOURNAI (BE)
Quarry blast8 February 2018
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:01:072018-02-08
- UTC
- 12:01:072018-02-08
Main parameters
| Date and time | 2018-02-08 12:01:07 UTC 2018-02-08 13:01:07 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.589° N, 3.482° E Uncertainty ± 3.6 km |
| Event ID | ROB 6290 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-02-08 14:54:06 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
- 9
- Epicentral distance
- 28.9 – 194.7km
- 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: 6 measurements, root-mean-square deviation 0.25 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)9 stations | |||||
| LESLessines | 28.9 | 62 | 12:01:12.53+5.44 s | – | – |
| BOUBougnies | 39.7 | 124 | 12:01:13.99+6.90 s | – | – |
| SKQSteenkerque | 42.9 | 81 | 12:01:14.33+7.24 s | – | – |
| DOUDourbes | 96.4 | 124 | 12:01:24.13+17.04 s | – | – |
| MRDMaredsous | 96.8 | 109 | 12:01:23.84+16.75 s | – | – |
| GESGesves | 116.2 | 101 | 12:01:26.90+19.81 s | – | – |
| CLAClavier | 130.5 | 98 | 12:01:29.15+22.06 s | – | – |
| DSLBDessel | 132.4 | 57 | 12:01:29.44+22.35 s | 12:01:45.92+38.83 s | 16.48 |
| KLBKalborn | 194.7 | 105 | 12:01:38.40+31.31 s | – | – |