MARCHE-LES-DAMES (BE)
Known mine explosion30 May 2013
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 12:20:342013-05-30
- UTC
- 10:20:342013-05-30
Main parameters
| Date and time | 2013-05-30 10:20:34 UTC 2013-05-30 12:20:34 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.457° N, 4.987° E Uncertainty ± 2.5 km |
| Event ID | ROB 4886 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2013-05-30 12:42:44 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
- 11
- Epicentral distance
- 10.7 – 121.3km
- Mean velocity, P wave
- 6.2km/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: 10 measurements, root-mean-square deviation 0.70 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)10 stations | |||||
| GESGesves | 10.7 | 138 | 10:20:36.57+2.56 s | – | – |
| CLAClavier | 22.8 | 100 | 10:20:38.68+4.67 s | 10:20:41.70+7.69 s | 3.02 |
| MRDMaredsous | 23.2 | 222 | 10:20:38.53+4.52 s | – | – |
| CSECourt-Saint-Etienne | 33.5 | 300 | 10:20:39.37+5.36 s | – | – |
| RCHRochefort | 37.7 | 153 | 10:20:39.02+5.01 s | 10:20:44.54+10.53 s | 5.52 |
| DOUDourbes | 49.0 | 215 | 10:20:43.36+9.35 s | 10:20:49.03+15.02 s | 5.67 |
| SNFSeneffe | 50.3 | 277 | 10:20:42.80+8.79 s | – | – |
| SKQSteenkerque | 67.8 | 289 | 10:20:44.76+10.75 s | – | – |
| MEMSMembach | 74.5 | 76 | 10:20:46.84+12.83 s | – | – |
| WLFWalferdange | 121.3 | 136 | 10:20:56.83+22.82 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 75.1 | 63 | 10:20:47.14+13.13 s | – | – |