WAIMES (BE)
Quarry blast23 February 2021
- Magnitude
- 1.0ML
- Depth
- –
- Belgian time
- 13:55:192021-02-23
- UTC
- 12:55:192021-02-23
Main parameters
| Date and time | 2021-02-23 12:55:19 UTC 2021-02-23 13:55:19 Belgian time |
|---|---|
| Magnitude | ML 1.0 |
| Epicentral coordinates | 50.425° N, 6.092° E Uncertainty ± 1.3 km |
| Event ID | ROB 12430 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-02-23 14:07:01 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
- 9.6 – 39.4km
- Mean velocity, P wave
- 5.7km/s
- Mean velocity, S wave
- 3.2km/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 0.19 s. S wave: 5 measurements, root-mean-square deviation 0.20 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 | |||||
| MRGMont Rigi | 9.6 | 353 | 12:55:21.07+1.81 s | 12:55:22.84+3.58 s | 1.77 |
| HOUHouvegnez | 10.0 | 218 | 12:55:21.15+1.89 s | 12:55:22.82+3.56 s | 1.67 |
| MEMSMembach | 21.3 | 344 | 12:55:22.94+3.68 s | 12:55:26.02+6.76 s | 3.08 |
| MEMHMembach | 21.3 | 344 | 12:55:23.01+3.75 s | 12:55:26.02+6.76 s | 3.01 |
| KLBKalborn | 36.2 | 178 | 12:55:25.80+6.54 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 39.4 | 343 | 12:55:26.72+7.46 s | 12:55:31.80+12.54 s | 5.08 |