MARCHE-LES-DAMES (BE)
Known mine explosion22 February 2012
- Magnitude
- 1.6ML
- Depth
- 1.0km ± 0.4
- Belgian time
- 14:25:362012-02-22
- UTC
- 13:25:362012-02-22
Main parameters
| Date and time | 2012-02-22 13:25:36 UTC 2012-02-22 14:25:36 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.495° N, 4.986° E Uncertainty ± 9.8 km |
| Depth of hypocenter | 1.0 ± 0.4 km |
| Event ID | ROB 4677 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2012-03-05 16:03:05 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
- 14.2 – 73.3km
- Mean velocity, P wave
- 5.4km/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. Hypocenter at a depth of 1.0 km. P wave: 6 measurements, root-mean-square deviation 0.29 s.
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)5 stations | |||||
| GESGesves | 14.2 | 149 | 13:25:38.40+1.95 s | – | – |
| CLAClavier | 24.0 | 110 | 13:25:40.55+4.10 s | – | – |
| RCHRochefort | 41.5 | 155 | 13:25:43.63+7.18 s | – | – |
| DOUDourbes | 52.5 | 212 | 13:25:46.20+9.75 s | – | – |
| RQRRonquières | 55.3 | 283 | 13:25:45.78+9.33 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 73.3 | 66 | 13:25:49.49+13.04 s | – | – |
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