TOURNAI (BE)
Quarry blast24 January 2019
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 12:41:022019-01-24
- UTC
- 11:41:022019-01-24
Main parameters
| Date and time | 2019-01-24 11:41:02 UTC 2019-01-24 12:41:02 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.650° N, 3.470° E Uncertainty ± 1.3 km |
| Event ID | ROB 7710 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-01-24 13:08:51 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
- 27.3 – 136.5km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.4km/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: 10 measurements, root-mean-square deviation 0.16 s. S wave: 7 measurements, root-mean-square deviation 0.50 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 | |||||
| LESLessines | 27.3 | 75 | 11:41:07.92+5.44 s | 11:41:11.50+9.02 s | 3.58 |
| SKQSteenkerque | 43.2 | 90 | 11:41:10.06+7.58 s | 11:41:15.89+13.41 s | 5.83 |
| BOUBougnies | 44.5 | 131 | 11:41:10.36+7.88 s | – | – |
| BRQBracquegnies | 50.8 | 111 | 11:41:11.38+8.90 s | – | – |
| RQRRonquières | 53.7 | 95 | 11:41:11.57+9.09 s | – | – |
| UCCBUccle | 65.0 | 75 | 11:41:13.76+11.28 s | 11:41:21.39+18.91 s | 7.63 |
| ZEVZevekote | 67.4 | 324 | 11:41:14.26+11.78 s | 11:41:22.57+20.09 s | 8.31 |
| MRDMaredsous | 99.9 | 112 | 11:41:19.30+16.82 s | 11:41:31.99+29.51 s | 12.69 |
| DOUDourbes | 101.1 | 127 | 11:41:19.56+17.08 s | 11:41:32.65+30.17 s | 13.09 |
| GESGesves | 118.4 | 104 | 11:41:22.47+19.99 s | 11:41:38.67+36.19 s | 16.20 |
| CLAClavier | 132.4 | 100 | 11:41:24.87+22.39 s | – | – |
| RCHRochefort | 136.5 | 113 | 11:41:25.26+22.78 s | 11:41:43.78+41.30 s | 18.52 |