LESSINES (BE)
Quarry blast9 March 2017
- Magnitude
- 1.4ML
- Depth
- 10.0km ± 10.0
- Belgian time
- 14:45:022017-03-09
- UTC
- 13:45:022017-03-09
Main parameters
| Date and time | 2017-03-09 13:45:02 UTC 2017-03-09 14:45:02 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.713° N, 3.717° E Uncertainty ± 20.5 km |
| Depth of hypocenter | 10.0 ± 10.0 km |
| Event ID | ROB 5649 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2017-03-09 15:03:05 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
- 9
- Epicentral distance
- 8.9 – 162.5km
- Mean velocity, P wave
- 5.6km/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 10.0 km. P wave: 8 measurements, root-mean-square deviation 0.87 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)9 stations | ||||||
| LESLessines | 8.9 | 91 | 13:45:04.09+1.59 s | – | – | – |
| SKQSteenkerque | 26.6 | 105 | 13:45:06.76+4.26 s | – | – | – |
| RQRRonquières | 37.8 | 108 | 13:45:08.25+5.75 s | – | – | – |
| BRQBracquegnies | 39.3 | 131 | 13:45:09.52+7.02 s | – | – | – |
| SNFSeneffe | 46.0 | 119 | 13:45:10.22+7.72 s | – | – | – |
| UCCSUccle | 46.3 | 78 | 13:45:12.56+10.06 s | – | – | – |
| DOUDourbes | 92.8 | 137 | 13:45:19.49+16.99 s | 13:45:29.17+26.67 s | 9.68 | 7.3 |
| CLAClavier | 116.9 | 106 | 13:45:22.40+19.90 s | – | – | – |
| MEMSMembach | 162.5 | 93 | 13:45:27.03+24.53 s | – | – | – |