LESSINES (BE)
Known mine explosion28 February 2012
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 14:43:462012-02-28
- UTC
- 13:43:462012-02-28
Main parameters
| Date and time | 2012-02-28 13:43:46 UTC 2012-02-28 14:43:46 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.709° N, 3.839° E Uncertainty ± 5.0 km |
| Event ID | ROB 4650 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2012-04-27 16:39:30 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
- 18.3 – 153.9km
- Mean velocity, P wave
- 5.5km/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: 7 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)9 stations | |||||
| SKQSteenkerque | 18.3 | 111 | 13:43:49.68+2.84 s | 13:43:51.54+4.70 s | 1.86 |
| RQRRonquières | 29.6 | 113 | 13:43:51.41+4.57 s | 13:43:55.11+8.27 s | 3.70 |
| BOUBougnies | 36.4 | 168 | 13:43:53.04+6.20 s | – | – |
| ZEVZevekote | 81.4 | 306 | 13:44:01.02+14.18 s | – | – |
| DOUDourbes | 87.0 | 142 | 13:44:02.03+15.19 s | – | – |
| GESGesves | 95.5 | 112 | 13:44:04.19+17.35 s | – | – |
| MOLSMol | 103.9 | 57 | 13:44:04.62+17.78 s | – | – |
| MEMHMembach | 153.9 | 93 | 13:44:12.17+25.33 s | – | – |
| MEMSMembach | 153.9 | 93 | 13:44:12.38+25.54 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 147.9 | 87 | 13:44:11.54+24.70 s | – | – |