MALMEDY (BE)
Quarry blast11 October 2021
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 12:26:482021-10-11
- UTC
- 10:26:482021-10-11
Main parameters
| Date and time | 2021-10-11 10:26:48 UTC 2021-10-11 12:26:48 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.417° N, 6.069° E Uncertainty ± 0.9 km |
| Event ID | ROB 14580 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-10-13 22:58:26 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
- 7
- Epicentral distance
- 8.3 – 143.3km
- Mean velocity, P wave
- 5.9km/s
- Mean velocity, S wave
- 3.4km/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 0.13 s. S wave: 4 measurements, root-mean-square deviation 0.29 s.
Stations farther than 120 km are left out of the fit: the first waves to reach them have travelled beneath the crust, through the mantle, where they propagate faster.
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)6 stations | |||||
| HOUHouvegnez | 8.3 | 213 | 10:26:50.04+1.52 s | – | – |
| MEMHMembach | 21.8 | 349 | 10:26:52.32+3.80 s | 10:26:55.43+6.91 s | 3.11 |
| KLBKalborn | 35.4 | 175 | 10:26:54.67+6.15 s | 10:26:59.57+11.05 s | 4.90 |
| GESGesves | 69.9 | 267 | 10:27:00.80+12.28 s | 10:27:09.09+20.57 s | 8.29 |
| DOUDourbes | 111.0 | 252 | 10:27:07.76+19.24 s | – | – |
| SKQSteenkerque | 143.3 | 281 | 10:27:13.21+24.69 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 39.8 | 346 | 10:26:55.48+6.96 s | 10:27:00.79+12.27 s | 5.31 |