HILLESHEIM (DE)
Quarry blast16 August 2021
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 09:11:262021-08-16
- UTC
- 07:11:262021-08-16
Main parameters
| Date and time | 2021-08-16 07:11:26 UTC 2021-08-16 09:11:26 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.264° N, 6.675° E Uncertainty ± 1.1 km |
| Event ID | ROB 14250 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-08-16 09:36:37 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
- 44.4 – 149.8km
- Mean velocity, P wave
- 6.1km/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: 7 measurements, root-mean-square deviation 0.20 s. S wave: 5 measurements, root-mean-square deviation 0.43 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 | |||||
| KLBKalborn | 44.4 | 246 | 07:11:34.03+7.89 s | 07:11:40.14+14.00 s | 6.11 |
| HOUHouvegnez | 48.8 | 282 | 07:11:35.11+8.97 s | 07:11:40.70+14.56 s | 5.59 |
| VIAVianden | 49.8 | 223 | 07:11:35.14+9.00 s | 07:11:40.71+14.57 s | 5.57 |
| MRGMont Rigi | 50.8 | 303 | 07:11:35.24+9.10 s | 07:11:42.11+15.97 s | 6.87 |
| MEMSMembach | 60.9 | 309 | 07:11:36.98+10.84 s | 07:11:44.68+18.54 s | 7.70 |
| WLFWalferdange | 76.6 | 210 | 07:11:39.12+12.98 s | – | – |
| DOUDourbes | 149.8 | 264 | 07:11:52.03+25.89 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 76.7 | 317 | 07:11:39.78+13.64 s | – | – |