EUPEN (BE)
Quarry blast25 August 2021
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 16:14:132021-08-25
- UTC
- 14:14:132021-08-25
Main parameters
| Date and time | 2021-08-25 14:14:13 UTC 2021-08-25 16:14:13 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.663° N, 6.005° E Uncertainty ± 2.8 km |
| Event ID | ROB 14370 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-08-30 10:30:13 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
- 7
- Epicentral distance
- 6.0 – 34.4km
- Mean velocity, P wave
- 6.8km/s
- Mean velocity, S wave
- 3.4km/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: 7 measurements, root-mean-square deviation 0.59 s. S wave: 5 measurements, root-mean-square deviation 0.63 s.
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 | nm | |
|---|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)4 stations | ||||||
| MEMSMembach | 6.0 | 177 | 14:14:14.28+0.87 s | 14:14:15.49+2.08 s | 1.21 | 222.9 |
| TNLTernell | 12.3 | 134 | 14:14:15.93+2.52 s | 14:14:18.44+5.03 s | 2.51 | 6.4 |
| MRGMont Rigi | 17.6 | 164 | 14:14:16.40+2.99 s | 14:14:19.40+5.99 s | 3.00 | – |
| HOUHouvegnez | 34.4 | 180 | 14:14:19.47+6.06 s | 14:14:23.38+9.97 s | 3.91 | – |
| Dutch seismic network (KNMI)2 stations | ||||||
| HGNHeimansgroeve | 12.4 | 335 | 14:14:15.94+2.53 s | 14:14:18.30+4.89 s | 2.36 | – |
| TERZTerziet | 12.6 | 326 | 14:14:14.40+0.99 s | – | – | – |
| Bensberg seismic network (University of Cologne, Germany)1 station | ||||||
| DREDreilägerbach | 16.1 | 90 | 14:14:16.01+2.60 s | – | – | – |