GEROLSTEIN (DE)
Quarry blast1 December 2021
- Magnitude
- 1.3ML
- Depth
- –
- Belgian time
- 11:49:152021-12-01
- UTC
- 10:49:152021-12-01
Main parameters
| Date and time | 2021-12-01 10:49:15 UTC 2021-12-01 11:49:15 Belgian time |
|---|---|
| Magnitude | ML 1.3 |
| Epicentral coordinates | 50.233° N, 6.730° E Uncertainty ± 5.8 km |
| Event ID | ROB 14900 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-12-06 14:26:22 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
- 5
- Epicentral distance
- 46.8 – 153.3km
- Mean velocity, P wave
- 6.4km/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: 4 measurements, root-mean-square deviation 0.30 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)4 stations | |||||
| KLBKalborn | 46.8 | 252 | 10:49:24.28+8.33 s | 10:49:29.41+13.46 s | 5.13 |
| VIAVianden | 50.3 | 229 | 10:49:25.04+9.09 s | 10:49:30.40+14.45 s | 5.36 |
| HOUHouvegnez | 53.4 | 285 | 10:49:24.70+8.75 s | – | – |
| DOUDourbes | 153.3 | 265 | 10:49:42.25+26.30 s | 10:50:00.25+44.30 s | 18.00 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 81.9 | 316 | 10:49:29.67+13.72 s | – | – |