TOURNAI (BE)
Quarry blast11 October 2018
- Magnitude
- 2.2ML
- Depth
- –
- Belgian time
- 15:26:422018-10-11
- UTC
- 13:26:422018-10-11
Main parameters
| Date and time | 2018-10-11 13:26:42 UTC 2018-10-11 15:26:42 Belgian time |
|---|---|
| Magnitude | ML 2.2 |
| Epicentral coordinates | 50.638° N, 3.411° E Uncertainty ± 4.2 km |
| Event ID | ROB 7245 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-10-11 15:52:48 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
- 14
- Epicentral distance
- 31.6 – 201.1km
- Mean velocity, P wave
- 5.9km/s
- Mean velocity, S wave
- 3.2km/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: 7 measurements, root-mean-square deviation 0.35 s. S wave: 4 measurements, root-mean-square deviation 0.39 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)14 stations | |||||
| LESLessines | 31.6 | 75 | 13:26:47.30+5.13 s | 13:26:51.31+9.14 s | 4.01 |
| BOUBougnies | 46.9 | 126 | 13:26:49.91+7.74 s | – | – |
| SKQSteenkerque | 47.4 | 88 | 13:26:49.41+7.24 s | 13:26:55.25+13.08 s | 5.84 |
| BRQBracquegnies | 54.3 | 108 | 13:26:50.14+7.97 s | – | – |
| RQRRonquières | 57.7 | 93 | 13:26:51.09+8.92 s | – | – |
| MRDMaredsous | 103.3 | 111 | 13:26:58.86+16.69 s | 13:27:13.39+31.22 s | 14.53 |
| DOUDourbes | 103.6 | 125 | 13:26:59.18+17.01 s | 13:27:13.42+31.25 s | 14.24 |
| GESGesves | 122.2 | 103 | 13:27:01.94+19.77 s | 13:27:19.27+37.10 s | 17.33 |
| DSLSDessel | 133.8 | 60 | 13:27:04.73+22.56 s | – | – |
| MOLSMol | 134.0 | 61 | 13:27:05.07+22.90 s | – | – |
| MOLTMol | 134.1 | 61 | 13:27:05.07+22.90 s | – | – |
| CLAClavier | 136.3 | 100 | 13:27:04.40+22.23 s | – | – |
| OPTOpitter | 165.3 | 71 | 13:27:10.06+27.89 s | – | – |
| KLBKalborn | 201.1 | 106 | 13:27:13.83+31.66 s | – | – |