TOURNAI (BE)
Suspected quarry blast25 July 2019
- Magnitude
- 1.2ML
- Depth
- 1.5km ± 47.2
- Belgian time
- 13:00:062019-07-25
- UTC
- 11:00:062019-07-25
Main parameters
| Date and time | 2019-07-25 11:00:06 UTC 2019-07-25 13:00:06 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.630° N, 3.271° E Uncertainty ± 27.1 km |
| Depth of hypocenter | 1.5 ± 47.2 km |
| Event ID | ROB 8520 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-08-13 07:43:57 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
- 10
- Epicentral distance
- 41.4 – 164.7km
- 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. Hypocenter at a depth of 1.5 km. P wave: 7 measurements, root-mean-square deviation 0.28 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)10 stations | ||||||
| LESLessines | 41.4 | 77 | 11:00:13.98+7.33 s | 11:00:17.98+11.33 s | 4.00 | – |
| BOUBougnies | 54.8 | 119 | 11:00:15.79+9.14 s | – | – | – |
| SKQSteenkerque | 57.3 | 88 | 11:00:16.26+9.61 s | 11:00:25.23+18.58 s | 8.97 | 8.8 |
| BRQBracquegnies | 63.5 | 105 | 11:00:17.43+10.78 s | – | – | – |
| RQRRonquières | 67.6 | 92 | 11:00:17.70+11.05 s | – | – | – |
| UCCBUccle | 79.1 | 76 | 11:00:20.56+13.91 s | – | – | – |
| DOUDourbes | 111.5 | 122 | 11:00:25.93+19.28 s | – | – | – |
| GESGesves | 131.7 | 101 | 11:00:28.69+22.04 s | – | – | – |
| CLAClavier | 145.9 | 98 | 11:00:32.07+25.42 s | – | – | – |
| LCHLa Chartreuse | 164.7 | 89 | 11:00:27.82+21.17 s | – | – | – |