LESSINES (BE)
Quarry blast13 April 2017
- Magnitude
- 1.4ML
- Depth
- 1.8km ± 3.5
- Belgian time
- 14:45:092017-04-13
- UTC
- 12:45:092017-04-13
Main parameters
| Date and time | 2017-04-13 12:45:09 UTC 2017-04-13 14:45:09 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.721° N, 3.822° E Uncertainty ± 3.9 km |
| Depth of hypocenter | 1.8 ± 3.5 km |
| Event ID | ROB 5673 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2017-04-13 15:09:05 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
- 13
- Epicentral distance
- 1.9 – 176.6km
- Mean velocity, P wave
- 5.7km/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 1.8 km. P wave: 9 measurements, root-mean-square deviation 0.31 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)13 stations | ||||||
| LESLessines | 1.9 | 128 | 12:45:10.36+0.44 s | – | – | – |
| SKQSteenkerque | 19.9 | 114 | 12:45:13.11+3.19 s | – | – | – |
| RQRRonquières | 31.2 | 114 | 12:45:14.75+4.83 s | – | – | – |
| BRQBracquegnies | 34.8 | 140 | 12:45:16.13+6.21 s | – | – | – |
| SNFSeneffe | 40.2 | 125 | 12:45:16.23+6.31 s | – | – | – |
| DOUDourbes | 88.7 | 141 | 12:45:25.52+15.60 s | 12:45:36.19+26.27 s | 10.67 | – |
| DSLBDessel | 104.2 | 56 | 12:45:28.04+18.12 s | – | – | – |
| CLAClavier | 110.1 | 107 | 12:45:28.66+18.74 s | 12:45:42.73+32.81 s | 14.07 | 6.7 |
| RCHRochefort | 118.0 | 122 | 12:45:30.66+20.74 s | 12:45:44.07+34.15 s | 13.41 | – |
| EBNEben-Emael | 131.2 | 86 | 12:45:31.63+21.71 s | – | – | – |
| MEMHMembach | 155.2 | 94 | 12:45:35.83+25.91 s | – | – | – |
| HOUHouvegnez | 160.1 | 104 | 12:45:36.23+26.31 s | – | – | – |
| KLBKalborn | 176.6 | 112 | 12:45:38.87+28.95 s | – | – | – |