TOURNAI (BE)
Quarry blast15 January 2020
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:02:232020-01-15
- UTC
- 12:02:232020-01-15
Main parameters
| Date and time | 2020-01-15 12:02:23 UTC 2020-01-15 13:02:23 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.655° N, 3.316° E Uncertainty ± 3.6 km |
| Event ID | ROB 9125 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-01-15 13:30:45 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
- 19
- Epicentral distance
- 37.8 – 220.7km
- Mean velocity, P wave
- 5.9km/s
- Mean velocity, S wave
- 3.5km/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: 11 measurements, root-mean-square deviation 0.44 s. S wave: 5 measurements, root-mean-square deviation 0.31 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)18 stations | |||||
| LESLessines | 37.8 | 80 | 12:02:30.67+6.88 s | 12:02:34.63+10.84 s | 3.96 |
| BOUBougnies | 53.5 | 123 | 12:02:33.05+9.26 s | 12:02:39.50+15.71 s | 6.45 |
| SKQSteenkerque | 54.0 | 90 | 12:02:32.74+8.95 s | 12:02:38.84+15.05 s | 6.10 |
| ZEVZevekote | 61.1 | 332 | 12:02:34.94+11.15 s | – | – |
| BRQBracquegnies | 61.2 | 108 | 12:02:34.06+10.27 s | – | – |
| RQRRonquières | 64.5 | 94 | 12:02:34.43+10.64 s | – | – |
| OSTBOostende | 70.1 | 338 | 12:02:36.02+12.23 s | – | – |
| UCCBUccle | 75.4 | 77 | 12:02:37.51+13.72 s | 12:02:45.36+21.57 s | 7.85 |
| TGATangissart | 85.5 | 93 | 12:02:37.75+13.96 s | – | – |
| DOUDourbes | 110.2 | 124 | 12:02:42.62+18.83 s | 12:02:55.69+31.90 s | 13.07 |
| MRDMaredsous | 110.3 | 110 | 12:02:42.37+18.58 s | – | – |
| GESGesves | 129.1 | 103 | 12:02:45.11+21.32 s | 12:03:00.68+36.89 s | 15.57 |
| DSLSDessel | 138.7 | 62 | 12:02:47.81+24.02 s | – | – |
| CLAClavier | 143.2 | 100 | 12:02:48.64+24.85 s | 12:03:06.42+42.63 s | 17.78 |
| RCHRochefort | 146.8 | 112 | 12:02:48.21+24.42 s | 12:03:05.47+41.68 s | 17.26 |
| MRGMont Rigi | 196.0 | 94 | 12:02:55.98+32.19 s | – | – |
| KLBKalborn | 208.0 | 106 | 12:02:56.79+33.00 s | – | – |
| VIAVianden | 220.7 | 110 | 12:03:00.02+36.23 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 185.1 | 85 | 12:02:53.82+30.03 s | – | – |