TOURNAI (BE)
Quarry blast21 March 2017
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 13:01:422017-03-21
- UTC
- 12:01:422017-03-21
Main parameters
| Date and time | 2017-03-21 12:01:42 UTC 2017-03-21 13:01:42 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.595° N, 3.479° E Uncertainty ± 4.7 km |
| Event ID | ROB 5654 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2017-03-21 13:16:48 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
- 13
- Epicentral distance
- 28.8 – 174.3km
- Mean velocity, P wave
- 5.7km/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: 9 measurements, root-mean-square deviation 0.58 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)11 stations | |||||
| LESLessines | 28.8 | 63 | 12:01:47.74+5.05 s | 12:01:51.52+8.83 s | 3.78 |
| BOUBougnies | 40.2 | 125 | 12:01:50.18+7.49 s | – | – |
| SKQSteenkerque | 42.9 | 82 | 12:01:49.79+7.10 s | 12:01:55.74+13.05 s | 5.95 |
| RQRRonquières | 52.8 | 88 | 12:01:50.45+7.76 s | – | – |
| SNFSeneffe | 57.8 | 99 | 12:01:52.08+9.39 s | – | – |
| DOUDourbes | 96.9 | 125 | 12:01:59.48+16.79 s | – | – |
| MRDMaredsous | 97.2 | 109 | 12:01:59.49+16.80 s | – | – |
| GESGesves | 116.4 | 101 | 12:02:02.43+19.74 s | – | – |
| CLAClavier | 130.8 | 98 | 12:02:04.91+22.22 s | – | – |
| MOLSMol | 132.2 | 58 | 12:02:03.50+20.81 s | – | – |
| RCHRochefort | 133.6 | 111 | 12:02:05.49+22.80 s | 12:02:21.17+38.48 s | 15.68 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 174.3 | 83 | 12:02:11.55+28.86 s | – | – |
| Network STR1 station | |||||
| MENFMencas | 93.9 | 268 | 12:01:59.62+16.93 s | – | – |