FLEMALLE (BE)
Quarry blast20 May 2020
- Magnitude
- 1.1ML
- Depth
- –
- Belgian time
- 12:04:332020-05-20
- UTC
- 10:04:332020-05-20
Main parameters
| Date and time | 2020-05-20 10:04:33 UTC 2020-05-20 12:04:33 Belgian time |
|---|---|
| Magnitude | ML 1.1 |
| Epicentral coordinates | 50.581° N, 5.441° E Uncertainty ± 1.3 km |
| Event ID | ROB 10060 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-05-20 12:38:25 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
- 12
- Epicentral distance
- 13.0 – 80.9km
- Mean velocity, P wave
- 5.8km/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: 11 measurements, root-mean-square deviation 0.28 s. S wave: 9 measurements, root-mean-square deviation 0.74 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)10 stations | |||||
| LCHLa Chartreuse | 13.0 | 60 | 10:04:36.50+2.61 s | 10:04:38.74+4.85 s | 2.24 |
| CLAClavier | 20.5 | 209 | 10:04:37.11+3.22 s | 10:04:39.08+5.19 s | 1.97 |
| GESGesves | 33.2 | 229 | 10:04:39.54+5.65 s | 10:04:45.00+11.11 s | 5.46 |
| MEMHMembach | 40.4 | 85 | 10:04:41.23+7.34 s | 10:04:46.89+13.00 s | 5.66 |
| MRGMont Rigi | 45.6 | 100 | 10:04:42.42+8.53 s | 10:04:48.19+14.30 s | 5.77 |
| HOUHouvegnez | 47.3 | 122 | 10:04:42.51+8.62 s | – | – |
| RCHRochefort | 49.7 | 198 | – | 10:04:47.96+14.07 s | – |
| MRDMaredsous | 57.0 | 237 | 10:04:43.81+9.92 s | – | – |
| KLBKalborn | 71.6 | 138 | 10:04:46.64+12.75 s | 10:04:54.62+20.73 s | 7.98 |
| DOUDourbes | 80.9 | 228 | 10:04:48.30+14.41 s | – | – |
| Dutch seismic network (KNMI)2 stations | |||||
| VKBValkenburg | 40.1 | 37 | 10:04:40.95+7.06 s | 10:04:45.92+12.03 s | 4.97 |
| HGNHeimansgroeve | 40.3 | 59 | 10:04:41.31+7.42 s | 10:04:46.00+12.11 s | 4.69 |