WAIMES (BE)
Quarry blast30 September 2021
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 11:44:332021-09-30
- UTC
- 09:44:332021-09-30
Main parameters
| Date and time | 2021-09-30 09:44:33 UTC 2021-09-30 11:44:33 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.421° N, 6.115° E Uncertainty ± 1.5 km |
| Event ID | ROB 14530 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-10-01 09:15:13 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
- 12
- Epicentral distance
- 10.4 – 130.4km
- Mean velocity, P wave
- 5.9km/s
- Mean velocity, S wave
- 3.5km/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: 11 measurements, root-mean-square deviation 0.30 s. S wave: 5 measurements, root-mean-square deviation 0.23 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 | |||||
| MRGMont Rigi | 10.4 | 344 | 09:44:35.79+1.87 s | 09:44:37.39+3.47 s | 1.60 |
| HOUHouvegnez | 10.8 | 226 | 09:44:35.85+1.93 s | 09:44:37.45+3.53 s | 1.60 |
| MEMSMembach | 22.2 | 340 | 09:44:37.90+3.98 s | 09:44:40.59+6.67 s | 2.69 |
| MEMHMembach | 22.2 | 340 | 09:44:37.90+3.98 s | – | – |
| KLBKalborn | 35.7 | 181 | 09:44:40.53+6.61 s | – | – |
| VIAVianden | 54.4 | 173 | 09:44:43.79+9.87 s | 09:44:49.57+15.65 s | 5.78 |
| RCHRochefort | 69.9 | 245 | 09:44:46.82+12.90 s | – | – |
| GESGesves | 73.2 | 267 | 09:44:46.80+12.88 s | – | – |
| MRDMaredsous | 96.8 | 263 | 09:44:50.87+16.95 s | – | – |
| DOUDourbes | 114.3 | 252 | 09:44:53.24+19.32 s | – | – |
| SNFSeneffe | 130.4 | 275 | 09:44:56.16+22.24 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 40.3 | 341 | 09:44:41.25+7.33 s | 09:44:46.20+12.28 s | 4.95 |