LESSINES (BE)
Known mine explosion14 August 2015
- Magnitude
- 1.6ML
- Depth
- 4.3km ± 4.1
- Belgian time
- 11:44:402015-08-14
- UTC
- 09:44:402015-08-14
Main parameters
| Date and time | 2015-08-14 09:44:40 UTC 2015-08-14 11:44:40 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.730° N, 3.844° E Uncertainty ± 3.5 km |
| Depth of hypocenter | 4.3 ± 4.1 km |
| Event ID | ROB 5396 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2015-08-14 13:45:21 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
- 2.2 – 158.8km
- 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 4.3 km. P wave: 9 measurements, root-mean-square deviation 0.72 s. S wave: 5 measurements, root-mean-square deviation 0.58 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)10 stations | ||||||
| LESLessines | 2.2 | 182 | 09:44:40.93+0.49 s | – | – | – |
| SKQSteenkerque | 19.0 | 118 | 09:44:43.60+3.16 s | – | – | – |
| RQRRonquières | 30.3 | 117 | 09:44:45.36+4.92 s | 09:44:49.00+8.56 s | 3.64 | – |
| BRQBracquegnies | 34.6 | 143 | 09:44:46.45+6.01 s | – | – | – |
| UCCBUccle | 37.1 | 78 | 09:44:44.80+4.36 s | 09:44:52.37+11.93 s | 7.57 | – |
| BOUBougnies | 38.7 | 169 | 09:44:47.82+7.38 s | – | – | – |
| SNFSeneffe | 39.6 | 128 | 09:44:47.29+6.85 s | 09:44:52.53+12.09 s | 5.24 | – |
| DOUDourbes | 88.6 | 143 | 09:44:55.92+15.48 s | 09:45:06.03+25.59 s | 10.11 | 11.9 |
| GESGesves | 96.1 | 113 | 09:44:56.73+16.29 s | 09:45:08.49+28.05 s | 11.76 | – |
| HOUHouvegnez | 158.8 | 104 | 09:45:06.00+25.56 s | – | – | – |