NAMUR (BE)
Quarry blast8 May 2020
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 14:32:472020-05-08
- UTC
- 12:32:472020-05-08
Main parameters
| Date and time | 2020-05-08 12:32:47 UTC 2020-05-08 14:32:47 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.492° N, 4.970° E Uncertainty ± 1.0 km |
| Event ID | ROB 10000 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-05-08 16:12:42 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
- 15
- Epicentral distance
- 14.6 – 107.6km
- Mean velocity, P wave
- 5.7km/s
- Mean velocity, S wave
- 3.1km/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: 15 measurements, root-mean-square deviation 0.34 s. S wave: 7 measurements, root-mean-square deviation 0.33 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)13 stations | |||||
| GESGesves | 14.6 | 145 | 12:32:49.26+2.06 s | 12:32:51.48+4.28 s | 2.22 |
| MRDMaredsous | 25.6 | 214 | 12:32:51.78+4.58 s | 12:32:55.68+8.48 s | 3.90 |
| TGATangissart | 34.1 | 292 | 12:32:52.82+5.62 s | 12:32:57.45+10.25 s | 4.63 |
| RCHRochefort | 41.8 | 154 | 12:32:54.28+7.08 s | 12:32:59.92+12.72 s | 5.64 |
| DOUDourbes | 51.7 | 211 | 12:32:56.65+9.45 s | 12:33:03.23+16.03 s | 6.58 |
| UCCSUccle | 54.9 | 308 | 12:32:56.66+9.46 s | – | – |
| EBNEben-Emael | 60.5 | 56 | 12:32:58.32+11.12 s | – | – |
| SKQSteenkerque | 65.4 | 286 | 12:32:58.64+11.44 s | – | – |
| MEMSMembach | 74.8 | 80 | 12:32:59.87+12.67 s | – | – |
| MEMHMembach | 74.8 | 80 | 12:32:59.94+12.74 s | – | – |
| MRGMont Rigi | 78.4 | 88 | 12:33:00.67+13.47 s | – | – |
| KLBKalborn | 92.2 | 118 | 12:33:03.19+15.99 s | – | – |
| VIAVianden | 107.6 | 125 | 12:33:06.10+18.90 s | 12:33:21.65+34.45 s | 15.55 |
| Dutch seismic network (KNMI)2 stations | |||||
| VKBValkenburg | 71.1 | 54 | 12:32:59.35+12.15 s | 12:33:09.74+22.54 s | 10.39 |
| HGNHeimansgroeve | 74.4 | 66 | 12:32:59.36+12.16 s | – | – |