MALMEDY (BE)
Quarry blast21 January 2022
- Magnitude
- 1.1ML
- Depth
- –
- Belgian time
- 13:30:462022-01-21
- UTC
- 12:30:462022-01-21
Main parameters
| Date and time | 2022-01-21 12:30:46 UTC 2022-01-21 13:30:46 Belgian time |
|---|---|
| Magnitude | ML 1.1 |
| Epicentral coordinates | 50.444° N, 6.058° E Uncertainty ± 1.5 km |
| Event ID | ROB 15240 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-01-21 14:51:37 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
- 7.6 – 38.4km
- Mean velocity, P wave
- 5.4km/s
- Mean velocity, S wave
- 3.1km/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: 6 measurements, root-mean-square deviation 0.32 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 | 7.6 | 9 | 12:30:48.06+1.38 s | 12:30:48.93+2.25 s | 0.87 |
| HOUHouvegnez | 10.7 | 201 | 12:30:48.85+2.17 s | 12:30:50.04+3.36 s | 1.19 |
| MEMHMembach | 18.7 | 349 | 12:30:50.22+3.54 s | 12:30:53.07+6.39 s | 2.85 |
| MEMSMembach | 18.7 | 349 | 12:30:50.27+3.59 s | 12:30:53.05+6.37 s | 2.78 |
| KLBKalborn | 38.4 | 175 | 12:30:53.96+7.28 s | 12:30:58.54+11.86 s | 4.58 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 36.7 | 346 | 12:30:53.52+6.84 s | 12:30:58.77+12.09 s | 5.25 |