ANDENNE (BE)
Quarry blast4 November 2020
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:19:532020-11-04
- UTC
- 12:19:532020-11-04
Main parameters
| Date and time | 2020-11-04 12:19:53 UTC 2020-11-04 13:19:53 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.506° N, 4.973° E Uncertainty ± 1.3 km |
| Event ID | ROB 11245 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-11-04 14:21:15 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
- 11
- Epicentral distance
- 15.7 – 74.4km
- Mean velocity, P wave
- 5.9km/s
- Mean velocity, S wave
- 3.2km/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 0.35 s. S wave: 5 measurements, root-mean-square deviation 0.31 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 | |||||
| GESGesves | 15.7 | 149 | 12:19:55.90+2.62 s | 12:19:57.94+4.66 s | 2.04 |
| CLAClavier | 25.3 | 112 | 12:19:57.78+4.50 s | 12:20:01.40+8.12 s | 3.62 |
| MRDMaredsous | 27.0 | 213 | 12:19:58.31+5.03 s | 12:20:02.26+8.98 s | 3.95 |
| TGATangissart | 33.8 | 289 | 12:19:59.32+6.04 s | – | – |
| RCHRochefort | 43.0 | 155 | 12:20:00.73+7.45 s | 12:20:06.83+13.55 s | 6.10 |
| DOUDourbes | 53.1 | 211 | 12:20:01.52+8.24 s | 12:20:09.52+16.24 s | 8.00 |
| RQRRonquières | 54.2 | 282 | 12:20:02.91+9.63 s | – | – |
| SKQSteenkerque | 65.2 | 284 | 12:20:04.18+10.90 s | – | – |
| MEMSMembach | 74.4 | 81 | 12:20:06.31+13.03 s | – | – |
| MEMHMembach | 74.4 | 81 | 12:20:06.38+13.10 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 73.6 | 67 | 12:20:05.91+12.63 s | – | – |