LIBRAMONT-CHEVIGNY (BE)
Quarry blast9 April 2020
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 14:23:312020-04-09
- UTC
- 12:23:312020-04-09
Main parameters
| Date and time | 2020-04-09 12:23:31 UTC 2020-04-09 14:23:31 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 49.966° N, 5.340° E Uncertainty ± 0.6 km |
| Event ID | ROB 9800 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-04-09 14:53:24 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
- 10
- Epicentral distance
- 22.5 – 98.2km
- Mean velocity, P wave
- 6.0km/s
- Mean velocity, S wave
- 3.5km/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: 10 measurements, root-mean-square deviation 0.31 s. S wave: 5 measurements, root-mean-square deviation 0.48 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)9 stations | |||||
| RCHRochefort | 22.5 | 339 | 12:23:35.94+4.36 s | 12:23:38.87+7.29 s | 2.93 |
| GESGesves | 50.0 | 339 | 12:23:41.02+9.44 s | – | – |
| DOUDourbes | 55.3 | 285 | 12:23:41.58+10.00 s | 12:23:48.00+16.42 s | 6.42 |
| MRDMaredsous | 55.4 | 313 | 12:23:41.18+9.60 s | 12:23:48.20+16.62 s | 7.02 |
| KLBKalborn | 57.1 | 75 | 12:23:41.19+9.61 s | 12:23:47.51+15.93 s | 6.32 |
| VIAVianden | 62.0 | 93 | 12:23:42.36+10.78 s | – | – |
| HOUHouvegnez | 64.2 | 48 | 12:23:42.42+10.84 s | – | – |
| MRGMont Rigi | 80.1 | 41 | 12:23:45.36+13.78 s | – | – |
| MEMHMembach | 86.0 | 33 | 12:23:46.46+14.88 s | 12:23:57.03+25.45 s | 10.57 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 98.2 | 25 | 12:23:48.87+17.29 s | – | – |