WAIMES (BE)
Quarry blast8 June 2021
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 15:28:542021-06-08
- UTC
- 13:28:542021-06-08
Main parameters
| Date and time | 2021-06-08 13:28:54 UTC 2021-06-08 15:28:54 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.426° N, 6.111° E Uncertainty ± 0.7 km |
| Event ID | ROB 13620 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-06-10 00:20:16 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
- 8
- Epicentral distance
- 9.7 – 146.1km
- 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: 7 measurements, root-mean-square deviation 0.21 s. S wave: 6 measurements, root-mean-square deviation 0.45 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)7 stations | |||||
| MRGMont Rigi | 9.7 | 345 | 13:28:56.29+1.93 s | – | – |
| HOUHouvegnez | 11.0 | 223 | 13:28:56.32+1.96 s | 13:28:56.85+2.49 s | 0.53 |
| MEMHMembach | 21.5 | 341 | 13:28:58.46+4.10 s | 13:29:01.15+6.79 s | 2.69 |
| KLBKalborn | 36.3 | 180 | 13:29:00.99+6.63 s | 13:29:05.64+11.28 s | 4.65 |
| VIAVianden | 55.1 | 173 | 13:29:03.72+9.36 s | 13:29:11.13+16.77 s | 7.41 |
| DOUDourbes | 114.2 | 252 | 13:29:14.02+19.66 s | 13:29:28.19+33.83 s | 14.17 |
| SKQSteenkerque | 146.1 | 281 | 13:29:19.13+24.77 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 39.6 | 341 | 13:29:01.69+7.33 s | 13:29:06.33+11.97 s | 4.64 |