AMEL (BE)
Quarry blast4 August 2021
- Magnitude
- 1.0ML
- Depth
- –
- Belgian time
- 12:58:472021-08-04
- UTC
- 10:58:472021-08-04
Main parameters
| Date and time | 2021-08-04 10:58:47 UTC 2021-08-04 12:58:47 Belgian time |
|---|---|
| Magnitude | ML 1.0 |
| Epicentral coordinates | 50.387° N, 6.151° E Uncertainty ± 1.5 km |
| Event ID | ROB 14180 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-08-06 18:28:13 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
- 11.0 – 44.7km
- Mean velocity, P wave
- 5.7km/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: 5 measurements, root-mean-square deviation 0.15 s. S wave: 4 measurements, root-mean-square deviation 0.18 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 | 11.0 | 251 | 10:58:49.47+2.16 s | 10:58:51.19+3.88 s | 1.72 |
| MRGMont Rigi | 14.8 | 339 | 10:58:50.06+2.75 s | 10:58:52.04+4.73 s | 1.98 |
| MEMHMembach | 26.6 | 338 | 10:58:52.36+5.05 s | 10:58:55.71+8.40 s | 3.35 |
| KLBKalborn | 32.1 | 185 | 10:58:53.52+6.21 s | 10:58:56.98+9.67 s | 3.46 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 44.7 | 340 | 10:58:55.46+8.15 s | – | – |