BRAINE-LE-COMTE (BE)
Quarry blast17 September 2019
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 14:03:592019-09-17
- UTC
- 12:03:592019-09-17
Main parameters
| Date and time | 2019-09-17 12:03:59 UTC 2019-09-17 14:03:59 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.609° N, 4.117° E Uncertainty ± 0.7 km |
| Event ID | ROB 8670 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-09-17 14:17:07 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
- 5.2 – 134.0km
- Mean velocity, P wave
- 5.9km/s
- Mean velocity, S wave
- 3.3km/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 0.39 s. S wave: 4 measurements, root-mean-square deviation 0.27 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 | 5.2 | 330 | 12:04:00.27+0.80 s | 12:04:01.42+1.95 s | 1.15 |
| RQRRonquières | 7.7 | 92 | 12:04:01.03+1.56 s | – | – |
| BRQBracquegnies | 14.3 | 175 | 12:04:00.93+1.46 s | – | – |
| BOUBougnies | 27.3 | 207 | 12:04:04.52+5.05 s | – | – |
| MRDMaredsous | 57.5 | 126 | 12:04:09.16+9.69 s | 12:04:17.00+17.53 s | 7.84 |
| DOUDourbes | 66.5 | 149 | 12:04:11.11+11.64 s | 12:04:19.21+19.74 s | 8.10 |
| GESGesves | 73.2 | 110 | 12:04:12.04+12.57 s | 12:04:21.69+22.22 s | 9.65 |
| CLAClavier | 86.7 | 104 | 12:04:14.12+14.65 s | – | – |
| RCHRochefort | 93.7 | 122 | 12:04:15.22+15.75 s | – | – |
| MEMSMembach | 134.0 | 89 | 12:04:22.32+22.85 s | – | – |
| MEMHMembach | 134.0 | 89 | 12:04:22.35+22.88 s | – | – |