LESSINES (BE)
Quarry blast3 March 2017
- Magnitude
- 1.4ML
- Depth
- 10.0km ± 3.9
- Belgian time
- 09:27:522017-03-03
- UTC
- 08:27:522017-03-03
Main parameters
| Date and time | 2017-03-03 08:27:52 UTC 2017-03-03 09:27:52 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.729° N, 3.845° E Uncertainty ± 7.4 km |
| Depth of hypocenter | 10.0 ± 3.9 km |
| Event ID | ROB 5647 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2017-03-03 09:48:27 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
- 7
- Epicentral distance
- 2.0 – 153.7km
- Mean velocity, P wave
- 5.2km/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. Hypocenter at a depth of 10.0 km. P wave: 6 measurements, root-mean-square deviation 0.23 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)7 stations | ||||||
| LESLessines | 2.0 | 183 | 08:27:53.72+1.09 s | – | – | – |
| SKQSteenkerque | 18.9 | 118 | 08:27:56.37+3.74 s | 08:27:58.47+5.84 s | 2.10 | – |
| RQRRonquières | 30.2 | 117 | 08:27:58.16+5.53 s | – | – | – |
| BRQBracquegnies | 34.4 | 143 | 08:27:59.36+6.73 s | – | – | – |
| SNFSeneffe | 39.4 | 128 | 08:27:59.81+7.18 s | – | – | – |
| DOUDourbes | 88.4 | 143 | 08:28:08.97+16.34 s | 08:28:17.55+24.92 s | 8.58 | 7.7 |
| MEMHMembach | 153.7 | 94 | 08:28:16.92+24.29 s | – | – | – |