WAIMES (BE)
Quarry blast20 May 2021
- Magnitude
- 1.0ML
- Depth
- –
- Belgian time
- 11:35:532021-05-20
- UTC
- 09:35:532021-05-20
Main parameters
| Date and time | 2021-05-20 09:35:53 UTC 2021-05-20 11:35:53 Belgian time |
|---|---|
| Magnitude | ML 1.0 |
| Epicentral coordinates | 50.418° N, 6.080° E Uncertainty ± 1.4 km |
| Event ID | ROB 13485 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-05-20 12:09:39 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
- 5
- Epicentral distance
- 8.9 – 39.9km
- 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: 5 measurements, root-mean-square deviation 0.15 s. S wave: 5 measurements, root-mean-square deviation 0.25 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)4 stations | |||||
| HOUHouvegnez | 8.9 | 217 | 09:35:54.91+1.77 s | 09:35:55.92+2.78 s | 1.01 |
| MRGMont Rigi | 10.4 | 358 | 09:35:54.81+1.67 s | 09:35:56.77+3.63 s | 1.96 |
| MEMHMembach | 21.8 | 347 | 09:35:57.10+3.96 s | 09:36:00.39+7.25 s | 3.29 |
| KLBKalborn | 35.4 | 177 | 09:35:59.57+6.43 s | 09:36:03.91+10.77 s | 4.34 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 39.9 | 345 | 09:36:00.25+7.11 s | 09:36:05.76+12.62 s | 5.51 |