ARLON (BE)
Quarry blast4 May 2020
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:09:042020-05-04
- UTC
- 11:09:042020-05-04
Main parameters
| Date and time | 2020-05-04 11:09:04 UTC 2020-05-04 13:09:04 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 49.706° N, 5.754° E Uncertainty ± 1.4 km |
| Event ID | ROB 9950 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-05-04 15:09:34 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
- 41.1 – 96.9km
- Mean velocity, P wave
- 5.9km/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: 5 measurements, root-mean-square deviation 0.17 s. S wave: 4 measurements, root-mean-square deviation 0.26 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 | |||||
| VIAVianden | 41.1 | 52 | 11:09:11.22+7.22 s | 11:09:16.22+12.22 s | 5.00 |
| KLBKalborn | 50.7 | 30 | 11:09:13.06+9.06 s | 11:09:19.62+15.62 s | 6.56 |
| RCHRochefort | 62.7 | 323 | 11:09:15.16+11.16 s | 11:09:22.64+18.64 s | 7.48 |
| DOUDourbes | 93.8 | 298 | 11:09:20.14+16.14 s | 11:09:31.44+27.44 s | 11.30 |
| MRDMaredsous | 96.9 | 314 | 11:09:21.05+17.05 s | – | – |