MALMEDY (BE)
Quarry blast8 April 2021
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 12:25:112021-04-08
- UTC
- 10:25:112021-04-08
Main parameters
| Date and time | 2021-04-08 10:25:11 UTC 2021-04-08 12:25:11 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.417° N, 6.068° E Uncertainty ± 0.5 km |
| Event ID | ROB 13035 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-08 13:56:37 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
- 8.4 – 39.7km
- Mean velocity, P wave
- 5.8km/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: 5 measurements, root-mean-square deviation 0.10 s. S wave: 6 measurements, root-mean-square deviation 0.11 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 | |||||
| HOUHouvegnez | 8.4 | 212 | – | 10:25:14.34+2.90 s | – |
| MRGMont Rigi | 10.4 | 3 | 10:25:13.34+1.90 s | 10:25:15.12+3.68 s | 1.78 |
| MEMSMembach | 21.7 | 349 | 10:25:15.50+4.06 s | 10:25:18.42+6.98 s | 2.92 |
| MEMHMembach | 21.7 | 349 | 10:25:15.51+4.07 s | 10:25:18.36+6.92 s | 2.85 |
| KLBKalborn | 35.4 | 175 | 10:25:17.91+6.47 s | 10:25:22.44+11.00 s | 4.53 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 39.7 | 346 | 10:25:18.60+7.16 s | 10:25:24.00+12.56 s | 5.40 |