MARCHE-LES-DAMES (BE)
Known mine explosion23 July 2015
- Magnitude
- 1.7ML
- Depth
- 4.4km ± 4.1
- Belgian time
- 13:47:032015-07-23
- UTC
- 11:47:032015-07-23
Main parameters
| Date and time | 2015-07-23 11:47:03 UTC 2015-07-23 13:47:03 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.508° N, 4.971° E Uncertainty ± 1.4 km |
| Depth of hypocenter | 4.4 ± 4.1 km |
| Event ID | ROB 5389 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2015-07-24 07:04:07 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
- 15
- Epicentral distance
- 16.0 – 126.3km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.4km/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 4.4 km. P wave: 14 measurements, root-mean-square deviation 0.46 s. S wave: 6 measurements, root-mean-square deviation 0.33 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)15 stations | ||||||
| GESGesves | 16.0 | 149 | 11:47:05.81+2.31 s | 11:47:08.07+4.57 s | 2.26 | 423.0 |
| CLAClavier | 25.5 | 113 | 11:47:07.90+4.40 s | 11:47:11.16+7.66 s | 3.26 | 0.0 |
| MRDMaredsous | 27.1 | 212 | 11:47:08.31+4.81 s | 11:47:11.88+8.38 s | 3.57 | – |
| STISart Tilman | 42.9 | 79 | 11:47:11.26+7.76 s | – | – | – |
| RCHRochefort | 43.3 | 155 | 11:47:10.91+7.41 s | 11:47:16.76+13.26 s | 5.85 | – |
| LCHLa Chartreuse | 46.8 | 72 | 11:47:11.88+8.38 s | – | – | – |
| SNFSeneffe | 48.7 | 271 | 11:47:11.28+7.78 s | – | – | – |
| DOUDourbes | 53.2 | 210 | 11:47:13.11+9.61 s | 11:47:19.21+15.71 s | 6.10 | – |
| SKQSteenkerque | 65.0 | 284 | 11:47:14.15+10.65 s | – | – | – |
| BOUBougnies | 74.0 | 260 | 11:47:15.84+12.34 s | – | – | – |
| MEMHMembach | 74.5 | 81 | 11:47:15.76+12.26 s | – | – | – |
| HOUHouvegnez | 75.5 | 103 | 11:47:16.37+12.87 s | 11:47:25.24+21.74 s | 8.87 | 10.3 |
| MRGMont Rigi | 78.3 | 89 | 11:47:17.41+13.91 s | – | – | – |
| TNLTernell | 82.6 | 84 | 11:47:18.71+15.21 s | – | – | – |
| WLFWalferdange | 126.3 | 138 | 11:47:24.73+21.23 s | – | – | – |