WAIMES (BE)
Quarry blast9 April 2021
- Magnitude
- 0.8ML
- Depth
- –
- Belgian time
- 13:15:592021-04-09
- UTC
- 11:15:592021-04-09
Main parameters
| Date and time | 2021-04-09 11:15:59 UTC 2021-04-09 13:15:59 Belgian time |
|---|---|
| Magnitude | ML 0.8 |
| Epicentral coordinates | 50.391° N, 6.117° E Uncertainty ± 0.9 km |
| Event ID | ROB 13070 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-09 13:25:02 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 – 43.6km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.5km/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 0.13 s. S wave: 4 measurements, root-mean-square deviation 0.42 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 | 243 | 11:16:01.68+2.03 s | 11:16:02.55+2.90 s | 0.87 |
| MRGMont Rigi | 13.7 | 347 | 11:16:02.29+2.64 s | – | – |
| MEMHMembach | 25.5 | 343 | 11:16:04.48+4.83 s | 11:16:08.15+8.50 s | 3.67 |
| KLBKalborn | 32.3 | 181 | 11:16:05.74+6.09 s | 11:16:09.70+10.05 s | 3.96 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 43.6 | 343 | 11:16:07.32+7.67 s | 11:16:12.23+12.58 s | 4.91 |