TOURNAI (BE)
Known mine explosion16 March 2012
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 12:58:082012-03-16
- UTC
- 11:58:082012-03-16
Main parameters
| Date and time | 2012-03-16 11:58:08 UTC 2012-03-16 12:58:08 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.635° N, 3.440° E Uncertainty ± 3.2 km |
| Event ID | ROB 4686 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2012-03-16 13:45:15 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
- 7
- Epicentral distance
- 45.1 – 120.1km
- Mean velocity, P wave
- 5.7km/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: 6 measurements, root-mean-square deviation 0.35 s. S wave: 6 measurements, root-mean-square deviation 0.22 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)7 stations | |||||
| BOUBougnies | 45.1 | 127 | 11:58:16.42+7.88 s | 11:58:21.51+12.97 s | 5.09 |
| SKQSteenkerque | 45.3 | 88 | 11:58:15.37+6.83 s | 11:58:21.66+13.12 s | 6.29 |
| RQRRonquières | 55.6 | 93 | 11:58:17.67+9.13 s | 11:58:24.97+16.43 s | 7.30 |
| ZEVZevekote | 67.5 | 326 | 11:58:19.93+11.39 s | 11:58:28.43+19.89 s | 8.50 |
| OSTBOostende | 75.8 | 332 | 11:58:21.33+12.79 s | 11:58:30.72+22.18 s | 9.39 |
| DOUDourbes | 101.8 | 126 | 11:58:26.16+17.62 s | 11:58:37.98+29.44 s | 11.82 |
| GESGesves | 120.1 | 103 | 11:58:28.93+20.39 s | 11:58:44.13+35.59 s | 15.20 |