LESSINES (BE)
Known mine explosion23 September 2014
- Magnitude
- 2.0ML
- Depth
- 1.2km ± 6.2
- Belgian time
- 13:45:212014-09-23
- UTC
- 11:45:212014-09-23
Main parameters
| Date and time | 2014-09-23 11:45:21 UTC 2014-09-23 13:45:21 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.761° N, 3.830° E Uncertainty ± 4.2 km |
| Depth of hypocenter | 1.2 ± 6.2 km |
| Event ID | ROB 5188 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2014-09-23 14:04:51 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
- 6
- Epicentral distance
- 5.7 – 155.0km
- Mean velocity, P wave
- 5.8km/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 1.2 km. P wave: 5 measurements, root-mean-square deviation 0.09 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)6 stations | ||||||
| LESLessines | 5.7 | 171 | 11:45:22.62+1.08 s | – | – | – |
| SKQSteenkerque | 21.6 | 125 | 11:45:25.35+3.81 s | – | – | – |
| RQRRonquières | 32.8 | 122 | 11:45:27.14+5.60 s | – | – | – |
| SNFSeneffe | 42.5 | 131 | 11:45:28.72+7.18 s | – | – | – |
| DOUDourbes | 91.9 | 143 | 11:45:37.45+15.91 s | 11:45:48.55+27.01 s | 11.10 | – |
| MEMSMembach | 155.0 | 95 | 11:45:48.08+26.54 s | 11:46:06.47+44.93 s | 18.39 | 17.4 |