WAIMES (BE)
Quarry blast23 June 2021
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 14:24:192021-06-23
- UTC
- 12:24:192021-06-23
Main parameters
| Date and time | 2021-06-23 12:24:19 UTC 2021-06-23 14:24:19 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.423° N, 6.104° E Uncertainty ± 4.2 km |
| Event ID | ROB 13770 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-06-28 10:47:57 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
- 10.0 – 114.0km
- Mean velocity, P wave
- 5.9km/s
- Mean velocity, S wave
- 3.3km/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: 8 measurements, root-mean-square deviation 0.14 s. S wave: 6 measurements, root-mean-square deviation 0.16 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)7 stations | |||||
| MRGMont Rigi | 10.0 | 348 | 12:24:21.40+1.66 s | 12:24:22.94+3.20 s | 1.54 |
| HOUHouvegnez | 10.4 | 222 | 12:24:21.43+1.69 s | 12:24:23.18+3.44 s | 1.75 |
| MEMHMembach | 21.7 | 342 | 12:24:23.57+3.83 s | 12:24:26.69+6.95 s | 3.12 |
| MEMSMembach | 21.7 | 342 | 12:24:23.57+3.83 s | 12:24:26.70+6.96 s | 3.13 |
| KLBKalborn | 35.9 | 179 | 12:24:26.10+6.36 s | 12:24:30.59+10.85 s | 4.49 |
| DOUDourbes | 113.6 | 252 | 12:24:39.04+19.30 s | – | – |
| TGATangissart | 114.0 | 281 | 12:24:39.41+19.67 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 39.8 | 342 | 12:24:26.80+7.06 s | 12:24:32.11+12.37 s | 5.31 |