KRUFT (DE)
Quarry blast17 August 2020
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 11:45:092020-08-17
- UTC
- 09:45:092020-08-17
Main parameters
| Date and time | 2020-08-17 09:45:09 UTC 2020-08-17 11:45:09 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.383° N, 7.342° E Uncertainty ± 1.3 km |
| Event ID | ROB 10685 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-08-17 14:03:24 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
- 91.1 – 198.6km
- Mean velocity, P wave
- 5.1km/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: 6 measurements, root-mean-square deviation 0.34 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)10 stations | |||||
| MRGMont Rigi | 91.1 | 279 | 09:45:25.57+15.60 s | – | – |
| KLBKalborn | 93.4 | 251 | 09:45:25.26+15.29 s | 09:45:36.63+26.66 s | 11.37 |
| HOUHouvegnez | 95.2 | 269 | 09:45:25.97+16.00 s | – | – |
| VIAVianden | 95.5 | 239 | 09:45:26.14+16.17 s | – | – |
| MEMHMembach | 97.8 | 285 | 09:45:27.21+17.24 s | 09:45:39.58+29.61 s | 12.37 |
| EBNEben-Emael | 126.5 | 292 | 09:45:31.93+21.96 s | 09:45:46.59+36.62 s | 14.66 |
| LCHLa Chartreuse | 126.9 | 284 | 09:45:32.71+22.74 s | – | – |
| RCHRochefort | 152.9 | 261 | 09:45:36.24+26.27 s | 09:45:54.82+44.85 s | 18.58 |
| GESGesves | 160.4 | 271 | 09:45:36.62+26.65 s | 09:45:56.48+46.51 s | 19.86 |
| DOUDourbes | 198.6 | 262 | 09:45:41.48+31.51 s | 09:46:04.63+54.66 s | 23.15 |
| Dutch seismic network (KNMI)2 stations | |||||
| HGNHeimansgroeve | 108.5 | 294 | 09:45:28.64+18.67 s | 09:45:41.66+31.69 s | 13.02 |
| VKBValkenburg | 122.7 | 297 | 09:45:31.70+21.73 s | 09:45:47.17+37.20 s | 15.47 |