LESSINES (BE)
Quarry blast22 May 2018
- Magnitude
- 2.2ML
- Depth
- 0.2km ± 2.1
- Belgian time
- 14:19:442018-05-22
- UTC
- 12:19:442018-05-22
Main parameters
| Date and time | 2018-05-22 12:19:44 UTC 2018-05-22 14:19:44 Belgian time |
|---|---|
| Magnitude | ML 2.2 |
| Epicentral coordinates | 50.744° N, 3.792° E Uncertainty ± 3.6 km |
| Depth of hypocenter | 0.2 ± 2.1 km |
| Event ID | ROB 6680 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-05-30 15:46:23 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
- 5.1 – 128.2km
- Mean velocity, P wave
- 5.7km/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 0.2 km. P wave: 8 measurements, root-mean-square deviation 0.36 s. S wave: 4 measurements, root-mean-square deviation 0.29 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 | |
|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)9 stations | |||||
| LESLessines | 5.1 | 135 | 12:19:45.70+1.21 s | 12:19:45.73+1.24 s | 0.03 |
| SKQSteenkerque | 22.9 | 117 | 12:19:48.38+3.89 s | 12:19:50.36+5.87 s | 1.98 |
| RQRRonquières | 34.2 | 116 | 12:19:49.83+5.34 s | – | – |
| UCCSUccle | 40.5 | 81 | 12:19:50.84+6.35 s | – | – |
| ZEVZevekote | 76.5 | 305 | 12:19:57.79+13.30 s | 12:20:06.66+22.17 s | 8.87 |
| DOUDourbes | 92.0 | 141 | 12:19:59.87+15.38 s | – | – |
| DSLSDessel | 104.6 | 58 | 12:20:02.34+17.85 s | – | – |
| MOLSMol | 104.8 | 60 | 12:20:02.82+18.33 s | 12:20:15.18+30.69 s | 12.36 |
| LCHLa Chartreuse | 128.2 | 95 | 12:20:06.24+21.75 s | – | – |