VELBERT (DE)
Quarry blast21 January 2022
- Magnitude
- 1.9ML
- Depth
- 30.0km
- Belgian time
- 11:41:022022-01-21
- UTC
- 10:41:022022-01-21
Main parameters
| Date and time | 2022-01-21 10:41:02 UTC 2022-01-21 11:41:02 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 51.355° N, 7.017° E Uncertainty ± 3.0 km |
| Depth of hypocenter | 30.0 km |
| Event ID | ROB 15235 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-01-21 14:50:59 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
- 7
- Epicentral distance
- 69.7 – 153.6km
- Mean velocity, P wave
- 11.1km/s
- Mean velocity, S wave
- 4.4km/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. Hypocenter at a depth of 30.0 km. P wave: 4 measurements, root-mean-square deviation 0.86 s. S wave: 4 measurements, root-mean-square deviation 0.56 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 | |||||
| MRGMont Rigi | 114.9 | 216 | 10:41:19.62+17.06 s | 10:41:36.06+33.50 s | 16.44 |
| HOUHouvegnez | 132.2 | 213 | – | 10:41:37.89+35.33 s | – |
| STISart Tilman | 133.4 | 231 | 10:41:19.99+17.43 s | – | – |
| KLBKalborn | 153.6 | 205 | 10:41:26.97+24.41 s | 10:41:41.92+39.36 s | 14.95 |
| Dutch seismic network (KNMI)3 stations | |||||
| WTSBWinterswijk New | 69.7 | 348 | 10:41:16.26+13.70 s | 10:41:26.07+23.51 s | 9.81 |
| HGNHeimansgroeve | 100.5 | 230 | 10:41:17.49+14.93 s | 10:41:31.97+29.41 s | 14.48 |
| TERZTerziet | 102.4 | 230 | 10:41:20.04+17.48 s | 10:41:33.92+31.36 s | 13.88 |