BELGIUM
Known mine explosion25 March 2011
- Magnitude
- 2.3ML
- Depth
- –
- Belgian time
- 15:04:442011-03-25
- UTC
- 14:04:442011-03-25
Main parameters
| Date and time | 2011-03-25 14:04:44 UTC 2011-03-25 15:04:44 Belgian time |
|---|---|
| Magnitude | ML 2.3 |
| Epicentral coordinates | 50.701° N, 3.912° E Uncertainty ± 10.2 km |
| Event ID | ROB 4502 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2011-03-25 15:35:01 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
- 24.5 – 502.4km
- Mean velocity, P wave
- 5.3km/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: 4 measurements, root-mean-square deviation 0.78 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)5 stations | |||||
| RQRRonquières | 24.5 | 115 | 14:04:47.64+3.16 s | – | – |
| DOUH1Dourbes | 83.0 | 144 | 14:04:59.23+14.75 s | – | – |
| GESGesves | 90.4 | 112 | 14:04:58.80+14.32 s | – | – |
| CLAClavier | 103.3 | 107 | 14:05:03.23+18.75 s | – | – |
| MEMH1Membach | 148.6 | 93 | 14:05:09.38+24.90 s | – | – |
| British Geological Survey (United Kingdom)1 station | |||||
| MCH1MICHAELCHURCH | 502.4 | 289 | 14:05:53.19+68.71 s | – | – |