WAIMES (BE)
Quarry blast28 June 2021
- Magnitude
- 0.9ML
- Depth
- –
- Belgian time
- 13:10:342021-06-28
- UTC
- 11:10:342021-06-28
Main parameters
| Date and time | 2021-06-28 11:10:34 UTC 2021-06-28 13:10:34 Belgian time |
|---|---|
| Magnitude | ML 0.9 |
| Epicentral coordinates | 50.393° N, 6.121° E Uncertainty ± 1.5 km |
| Event ID | ROB 13850 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-07-06 17:02:24 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
- 6
- Epicentral distance
- 9.3 – 43.4km
- Mean velocity, P wave
- 5.7km/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: 6 measurements, root-mean-square deviation 0.07 s. S wave: 5 measurements, root-mean-square deviation 0.26 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 | |
|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)5 stations | |||||
| HOUHouvegnez | 9.3 | 242 | 11:10:36.58+2.05 s | 11:10:37.59+3.06 s | 1.01 |
| MRGMont Rigi | 13.6 | 346 | 11:10:37.26+2.73 s | 11:10:39.33+4.80 s | 2.07 |
| TNLTernell | 21.5 | 2 | 11:10:38.68+4.15 s | 11:10:40.89+6.36 s | 2.21 |
| MEMHMembach | 25.3 | 342 | 11:10:39.53+5.00 s | 11:10:42.55+8.02 s | 3.02 |
| KLBKalborn | 32.6 | 181 | 11:10:40.65+6.12 s | 11:10:44.47+9.94 s | 3.82 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 43.4 | 342 | 11:10:42.68+8.15 s | – | – |