TOURNAI (BE)
Quarry blast13 April 2017
- Magnitude
- 1.7ML
- Depth
- 9.8km ± 4.2
- Belgian time
- 13:00:452017-04-13
- UTC
- 11:00:452017-04-13
Main parameters
| Date and time | 2017-04-13 11:00:45 UTC 2017-04-13 13:00:45 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.678° N, 3.424° E Uncertainty ± 4.3 km |
| Depth of hypocenter | 9.8 ± 4.2 km |
| Event ID | ROB 5672 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2017-04-13 13:51:35 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
- 11
- Epicentral distance
- 29.8 – 201.5km
- Mean velocity, P wave
- 6.0km/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. Hypocenter at a depth of 9.8 km. P wave: 7 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 | nm | |
|---|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)11 stations | ||||||
| LESLessines | 29.8 | 83 | 11:00:50.83+5.57 s | 11:00:55.03+9.77 s | 4.20 | – |
| SKQSteenkerque | 46.5 | 94 | 11:00:53.34+8.08 s | 11:00:58.24+12.98 s | 4.90 | – |
| BOUBougnies | 49.0 | 131 | 11:00:53.61+8.35 s | – | – | – |
| BRQBracquegnies | 55.0 | 113 | 11:00:54.13+8.87 s | – | – | – |
| RQRRonquières | 57.2 | 98 | 11:00:55.03+9.77 s | – | – | – |
| SNFSeneffe | 63.7 | 107 | 11:00:55.76+10.50 s | – | – | – |
| DOUDourbes | 105.6 | 127 | 11:01:03.15+17.89 s | 11:01:16.31+31.05 s | 13.16 | – |
| GESGesves | 122.3 | 105 | 11:01:05.89+20.63 s | 11:01:19.69+34.43 s | 13.80 | – |
| CLAClavier | 136.2 | 102 | 11:01:08.28+23.02 s | 11:01:25.59+40.33 s | 17.31 | 9.1 |
| HOUHouvegnez | 186.6 | 100 | 11:01:14.76+29.50 s | – | – | – |
| KLBKalborn | 201.5 | 108 | 11:01:14.68+29.42 s | – | – | – |