NAMUR (BE)
Known mine explosion27 June 2011
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 14:14:562011-06-27
- UTC
- 12:14:562011-06-27
Main parameters
| Date and time | 2011-06-27 12:14:56 UTC 2011-06-27 14:14:56 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.499° N, 4.932° E Uncertainty ± 3.2 km |
| Event ID | ROB 4548 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2011-07-05 08:07:07 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
- 16.9 – 84.3km
- Mean velocity, P wave
- 5.7km/s
- Mean velocity, S wave
- 3.2km/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: 9 measurements, root-mean-square deviation 0.33 s. S wave: 6 measurements, root-mean-square deviation 0.70 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)9 stations | |||||
| GESGesves | 16.9 | 139 | 12:14:59.07+2.96 s | 12:15:01.09+4.98 s | 2.02 |
| MRDMaredsous | 24.9 | 208 | 12:15:00.58+4.47 s | 12:15:05.55+9.44 s | 4.97 |
| CLAClavier | 27.8 | 109 | 12:15:01.05+4.94 s | 12:15:04.52+8.41 s | 3.47 |
| RCHRochefort | 43.7 | 151 | 12:15:04.41+8.30 s | 12:15:10.07+13.96 s | 5.66 |
| DOUDourbes | 51.0 | 208 | 12:15:04.69+8.58 s | 12:15:12.27+16.16 s | 7.58 |
| RQRRonquières | 51.5 | 284 | – | 12:15:11.83+15.72 s | – |
| MEMHMembach | 77.4 | 81 | 12:15:09.94+13.83 s | – | – |
| MEMSMembach | 77.4 | 81 | 12:15:10.32+14.21 s | – | – |
| OPTOpitter | 84.3 | 36 | 12:15:11.01+14.90 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 76.6 | 67 | 12:15:09.31+13.20 s | – | – |