BRAINE-LE-COMTE (BE)
Quarry blast9 July 2018
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 14:02:592018-07-09
- UTC
- 12:02:592018-07-09
Main parameters
| Date and time | 2018-07-09 12:02:59 UTC 2018-07-09 14:02:59 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.599° N, 4.107° E Uncertainty ± 1.1 km |
| Event ID | ROB 6925 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-07-11 11:04:12 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
- 5.9 – 87.1km
- Mean velocity, P wave
- 6.0km/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: 7 measurements, root-mean-square deviation 0.44 s. S wave: 5 measurements, root-mean-square deviation 0.43 s.
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)7 stations | |||||
| SKQSteenkerque | 5.9 | 341 | 12:03:00.62+0.92 s | 12:03:01.88+2.18 s | 1.26 |
| RQRRonquières | 8.4 | 85 | 12:03:01.23+1.53 s | 12:03:02.98+3.28 s | 1.75 |
| BRQBracquegnies | 13.3 | 171 | 12:03:01.09+1.39 s | – | – |
| BOUBougnies | 26.1 | 206 | 12:03:04.62+4.92 s | – | – |
| MRDMaredsous | 57.4 | 125 | 12:03:09.30+9.60 s | 12:03:17.13+17.43 s | 7.83 |
| DOUDourbes | 66.0 | 148 | 12:03:10.95+11.25 s | 12:03:19.22+19.52 s | 8.27 |
| CLAClavier | 87.1 | 103 | 12:03:14.50+14.80 s | 12:03:24.81+25.11 s | 10.31 |