MALMEDY (BE)
Quarry blast29 March 2021
- Magnitude
- 0.8ML
- Depth
- –
- Belgian time
- 12:38:222021-03-29
- UTC
- 10:38:222021-03-29
Main parameters
| Date and time | 2021-03-29 10:38:22 UTC 2021-03-29 12:38:22 Belgian time |
|---|---|
| Magnitude | ML 0.8 |
| Epicentral coordinates | 50.432° N, 6.076° E Uncertainty ± 2.2 km |
| Event ID | ROB 12860 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-03-30 09:50:41 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
- 8.7 – 56.1km
- Mean velocity, P wave
- 5.7km/s
- Mean velocity, S wave
- 3.3km/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 0.22 s. S wave: 5 measurements, root-mean-square deviation 0.60 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 | 8.7 | 360 | 10:38:24.14+1.86 s | 10:38:24.53+2.25 s | 0.39 |
| HOUHouvegnez | 10.1 | 210 | 10:38:24.17+1.89 s | 10:38:25.25+2.97 s | 1.08 |
| MEMHMembach | 20.2 | 347 | 10:38:26.39+4.11 s | 10:38:29.76+7.48 s | 3.37 |
| KLBKalborn | 37.1 | 176 | 10:38:28.91+6.63 s | 10:38:33.56+11.28 s | 4.65 |
| VIAVianden | 56.1 | 171 | 10:38:32.13+9.85 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 38.3 | 345 | 10:38:29.55+7.27 s | 10:38:34.20+11.92 s | 4.65 |