BRAINE-LE-COMTE (BE)
Quarry blast28 February 2020
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 14:03:502020-02-28
- UTC
- 13:03:502020-02-28
Main parameters
| Date and time | 2020-02-28 13:03:50 UTC 2020-02-28 14:03:50 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.585° N, 4.117° E Uncertainty ± 1.4 km |
| Event ID | ROB 9360 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-02-28 14:19:10 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
- 7.5 – 134.1km
- Mean velocity, P wave
- 5.7km/s
- Mean velocity, S wave
- 3.2km/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. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 9 measurements, root-mean-square deviation 0.45 s. S wave: 4 measurements, root-mean-square deviation 0.25 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 | 7.5 | 340 | 13:03:51.97+1.51 s | 13:03:53.18+2.72 s | 1.21 |
| BRQBracquegnies | 11.7 | 173 | 13:03:52.40+1.94 s | – | – |
| UCCSUccle | 29.2 | 36 | 13:03:54.77+4.31 s | – | – |
| UCCBUccle | 29.2 | 36 | 13:03:54.86+4.40 s | 13:03:59.84+9.38 s | 4.98 |
| MRDMaredsous | 56.0 | 124 | 13:04:00.50+10.04 s | 13:04:08.02+17.56 s | 7.52 |
| DOUDourbes | 64.3 | 148 | 13:04:02.37+11.91 s | 13:04:10.39+19.93 s | 8.02 |
| GESGesves | 72.4 | 108 | 13:04:03.32+12.86 s | – | – |
| CLAClavier | 86.1 | 102 | 13:04:05.65+15.19 s | – | – |
| OSTBOostende | 110.1 | 312 | 13:04:09.38+18.92 s | – | – |
| MEMSMembach | 134.1 | 88 | 13:04:13.15+22.69 s | – | – |
| MEMHMembach | 134.1 | 88 | 13:04:13.23+22.77 s | – | – |