SOIGNIES (BE)
Quarry blast19 June 2018
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 14:04:482018-06-19
- UTC
- 12:04:482018-06-19
Main parameters
| Date and time | 2018-06-19 12:04:48 UTC 2018-06-19 14:04:48 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.572° N, 4.029° E Uncertainty ± 0.7 km |
| Event ID | ROB 6790 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-06-20 09:29:05 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
- 11
- Epicentral distance
- 9.3 – 157.1km
- 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. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 9 measurements, root-mean-square deviation 0.35 s. S wave: 5 measurements, root-mean-square deviation 0.42 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)11 stations | |||||
| SKQSteenkerque | 9.3 | 23 | 12:04:51.03+2.07 s | 12:04:52.20+3.24 s | 1.17 |
| BRQBracquegnies | 12.7 | 143 | 12:04:51.30+2.34 s | – | – |
| RQRRonquières | 14.4 | 75 | 12:04:51.57+2.61 s | – | – |
| LESLessines | 20.3 | 320 | 12:04:53.08+4.12 s | 12:04:55.33+6.37 s | 2.25 |
| BOUBougnies | 21.2 | 196 | 12:04:52.84+3.88 s | – | – |
| UCCSUccle | 34.2 | 43 | 12:04:54.82+5.86 s | – | – |
| MRDMaredsous | 60.5 | 120 | 12:04:59.71+10.75 s | 12:05:07.53+18.57 s | 7.82 |
| DOUDourbes | 66.6 | 143 | 12:05:01.53+12.57 s | 12:05:09.58+20.62 s | 8.05 |
| CLAClavier | 91.9 | 100 | 12:05:04.74+15.78 s | 12:05:15.79+26.83 s | 11.05 |
| MRGMont Rigi | 145.2 | 92 | 12:05:13.72+24.76 s | – | – |
| KLBKalborn | 157.1 | 109 | 12:05:16.07+27.11 s | 12:05:34.07+45.11 s | 18.00 |