ANDENNE (BE)
Quarry blast26 August 2020
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:48:512020-08-26
- UTC
- 11:48:512020-08-26
Main parameters
| Date and time | 2020-08-26 11:48:51 UTC 2020-08-26 13:48:51 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.510° N, 4.989° E Uncertainty ± 0.7 km |
| Event ID | ROB 10740 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-08-26 14:45:51 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
- 14
- Epicentral distance
- 15.5 – 79km
- Mean velocity, P wave
- 5.9km/s
- Mean velocity, S wave
- 3.3km/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: 14 measurements, root-mean-square deviation 0.32 s. S wave: 6 measurements, root-mean-square deviation 0.30 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)12 stations | |||||
| GESGesves | 15.5 | 153 | 11:48:54.00+2.72 s | 11:48:56.12+4.84 s | 2.12 |
| CLAClavier | 24.4 | 114 | 11:48:55.79+4.51 s | 11:48:59.37+8.09 s | 3.58 |
| MRDMaredsous | 27.9 | 214 | 11:48:56.16+4.88 s | 11:49:00.11+8.83 s | 3.95 |
| TGATangissart | 34.8 | 288 | 11:48:57.01+5.73 s | 11:49:02.45+11.17 s | 5.44 |
| RCHRochefort | 42.9 | 157 | 11:48:58.78+7.50 s | 11:49:04.72+13.44 s | 5.94 |
| LCHLa Chartreuse | 45.5 | 71 | 11:48:58.44+7.16 s | – | – |
| DOUDourbes | 54.0 | 211 | 11:49:01.21+9.93 s | 11:49:07.50+16.22 s | 6.29 |
| RQRRonquières | 55.2 | 281 | 11:49:01.10+9.82 s | – | – |
| SKQSteenkerque | 66.2 | 284 | 11:49:02.41+11.13 s | – | – |
| MEMSMembach | 73.2 | 81 | 11:49:03.93+12.65 s | – | – |
| MEMHMembach | 73.2 | 81 | 11:49:04.00+12.72 s | – | – |
| HOUHouvegnez | 74.2 | 103 | 11:49:04.16+12.88 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 72.4 | 67 | 11:49:04.03+12.75 s | – | – |
| Network not specified1 station | |||||
| MOLIOMol | 79* | – | 11:49:04.57+13.29 s | – | – |
* Distance from the catalogue, rounded to the kilometre: the coordinates of the station are missing from it.